Agu 2005
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This document discusses banded iron formations (BIFs), which are Precambrian sedimentary deposits composed of alternating layers of iron-rich material and silica. It notes that the five largest BIF deposits on Earth are in Australia, South Africa, Brazil, Canada, and Russia, and account for about 90% of the total estimated BIF deposits globally. The document also indicates that hematite deposits discovered on Mars in western equatorial areas could have formed hydrothermally in a similar way to hematite precipitated in BIFs on Earth.
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![Precambrian Banded Iron Fotmations of Hamersley Range Australia Peter Wasilewski NASA/ GSFC code 691 [email_address] Band Iron Formations on the top of Satellite Magnetic Anomalies (Sabaka, 2004) Abundance of BIF’s relative to hamersley Range Abundance of BIF’s through Time 2005 Joint Assembly of AGU, New Orleans USA GP13A-07 Magnetic Study of Terrestrial Band Iron Formations Katherine A Nazarova Raytheon ITSS NASA/GSFC [email_address] Band Iron Formations (BIF) are mainly Precambrian (2.5-1.8 Ga) sedimentary deposits and are composed of alternating layers of iron rich material and silica (chert). Precambrian BIF mark growth in the level of free oxygen in the atmosphere and the ocean which happened about 2.2 Ga. Distribution of main BIF includes Hamersley Range, Australia; Transvaal-Griquatown, South Africa; Minas Gerais, Brazil; Labrador Trough, Canada, and Kursk-Krivoi Rog (Russia). Together these five very large BIF deposits constitute about 90 percent of Earth's total estimated BIF (5.76*10 14 ). On each continent these ancient rocks usually metamorphosed and crystallized include what are variously described as hematite-quartzites, banded iron formations, banded jaspers or calico-rocks. West African, Hudson Bay and Western Australian Satellite Magnetic Anomalies coincide with distribution BIF deposits. The Kursk Satellite Magnetic Anomaly (KMA) (about 22 nT at the altitude=400km, centered at 51o N, 37o E) also was identified by ground and aeromagnetic observations and is recognized as one of the largest magnetic anomaly on the Earth. Magnetic modeling shows that immense Precambrian iron ore deposits (iron bands) of Voronezh uplift are the main source of KMA. Magnetic properties of 10000 BIF samples outcropped in the KMA area have been measured and analyzed (Krutikhovskaya et al., 1964) Rockmag BIF dataset is presented at: http://core2.gsfc.nasa.gov/MPDB/datasets.html. Mean NRM value is about 42 A/M, Qn about 1.4. Demagnetization tests suggest that hard and stable NRM component is caused by hematite occurring in BIF in different forms and grain sizes. Hematite deposits discovered on Mars in western equatorial area with layered topography of Aram Chaos and Sinus Meridiani could be of hydrothermal origin and may be formed similar to hematite precipitated in BIF on Earth . Observed and Modeled Satellite Magnetic Anomalies for Australia (Maus, 2004) Aeromagnetic Data Coverage over Australia NRM mean=42 A/m Qn mean=1.4 N= 10.000 samples Carbon Isotopes over Time Growth of Free Oxygen in the Earth’s Atmosphere through Time Hematite Distribution Map (Christensen et al., 2003) and Magnetics over Aram Chaos and Sinus Meridiani Layered Structures Mars Exploration Kursk Magnetic Anomaly and BIF Locations BIF Rock Mag Data ,[object Object],[object Object],[object Object]](https://image.slidesharecdn.com/agu2005-100111220655-phpapp02/85/Agu-2005-1-320.jpg)
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Fuels and Space Propellants Web Site:
http://www.grc.nasa.gov/WWW/Fuels-And-Space-Propellants/foctopsb.htm
Establishing a lunar presence and creating an industrial capability on the Moon may lead to important new discoveries for all of human kind. Historical studies of lunar exploration, in-situ resource utilization (ISRU) and industrialization all point to the vast resources on the Moon and its links to future human and robotic exploration. In the historical work, a broad range of technological innovations are described and analyzed. These studies depict program planning for future human missions throughout the solar system, lunar launched nuclear rockets, and future human settlements on the Moon, respectively. Updated analyses based on the visions presented are presented. While advanced propulsion systems were proposed in these historical studies, further investigation of nuclear options using high power nuclear thermal propulsion, nuclear surface power, as well as advanced chemical propulsion can significantly enhance these scenarios.
Robotic and human outer planet exploration options are described in many detailed and extensive studies. Nuclear propulsion options for fast trips to the outer planets are discussed. To refuel such vehicles, atmospheric mining in the outer solar system has also been investigated as a means of fuel production for high energy propulsion and power. Fusion fuels such as Helium 3 (3He) and hydrogen can be wrested from the atmospheres of Uranus and Neptune and either returned to Earth or used in-situ for energy production. Helium 3 and hydrogen (deuterium, etc.) were the primary gases of interest with hydrogen being the primary propellant for nuclear thermal solid core and gas core rocket-based atmospheric flight. A series of analyses have investigated resource capturing aspects of atmospheric mining in the outer solar system. These analyses included the gas capturing rate, storage options, and different methods of direct use of the captured gases. While capturing 3He, large amounts of hydrogen and 4He are produced. With these two additional gases, the potential for fueling small and large fleets of additional exploration and exploitation vehicles exists.
An Earth-sized exoplanet with a Mercury-like composition
Earth, Venus, Mars and some extrasolar terrestrial planets1
have a mass and radius that is consistent with a mass fraction
of about 30% metallic core and 70% silicate mantle2
. At the
inner frontier of the Solar System, Mercury has a completely
different composition, with a mass fraction of about 70%
metallic core and 30% silicate mantle3
. Several formation or
evolution scenarios are proposed to explain this metal-rich
composition, such as a giant impact4, mantle evaporation5
or the depletion of silicate at the inner edge of the protoplanetary
disk6. These scenarios are still strongly debated.
Here, we report the discovery of a multiple transiting planetary
system (K2-229) in which the inner planet has a radius
of 1.165 ± 0.066 Earth radii and a mass of 2.59 ± 0.43 Earth
masses. This Earth-sized planet thus has a core-mass fraction
that is compatible with that of Mercury, although it was
expected to be similar to that of Earth based on host-star
chemistry7
. This larger Mercury analogue either formed with
a very peculiar composition or has evolved, for example, by
losing part of its mantle. Further characterization of Mercurylike
exoplanets such as K2-229 b will help to put the detailed
in situ observations of Mercury (with MESSENGER and
BepiColombo8) into the global context of the formation and
evolution of solar and extrasolar terrestrial planets.
Cold Molecular Gas in Merger Remnants. I. Formation of Molecular Gas Discs
- 80% (24/30) of the merger remnants with robust CO detections showed kinematical signatures of rotating molecular gas disks (including nuclear rings) based on their velocity fields. The sizes of these disks varied significantly from 1.1 kpc to 9.3 kpc.
- In 54% of the sources, the size of the molecular gas disks was more compact than the K-band effective radius, possibly formed from past gas inflows triggered by dynamical instabilities during mergers.
- The remaining 46% had more extended gas disks relative to the stellar component, possibly forming late-type galaxies with central stellar bulges.
- The study suggests that nuclear and extended molecular gas disks are common in
In situ radiometric_and_exposure_age_dating_of_the_martian_surface
The document summarizes research on the Sheepbed mudstone sample collected by the Curiosity rover in Gale crater on Mars. Key points:
- Potassium-argon dating of the mudstone yielded an age of 4.21 ± 0.35 billion years, consistent with the expected antiquity of rocks in Gale crater.
- Cosmogenic neon-21, helium-3, and argon-36 isotopes in the mudstone yielded concordant surface exposure ages of 78 ± 30 million years, indicating recent exposure by wind erosion rather than during initial transport and deposition.
- The mudstone's composition and mineralogy suggest it has not been heated above 200°C and may preserve
49 collaboration with swedish deep drilling project dobson lbnl
This document discusses collaboration between Lawrence Berkeley National Laboratory and Uppsala University on the Swedish Deep Drilling Project (COSC). The COSC project aims to drill two deep boreholes (COSC-1 and COSC-2) to study geological structures and characterize basement rocks and hydrology. COSC-1 will drill through the Seve Nappe to study channel flow, reaching a depth of 2.5 km with 100% core recovery. Funded activities for COSC-1 include logging the borehole to detect flowing fractures, modeling fluid flow, analyzing microbial communities in fractures, characterizing water compositions, and studying fractured core samples.
Using the milk_way_satellites_to_study_interactions_between_cold_dark_matter_...
estudo com a matéria escura para explicar por que existem menos galáxias satélites ao redor da Via Láctea do que era esperado.
Volatile and organic_composition_of_sedimentary_rocks_in_yellowknife_bay_gale...
This document summarizes the results of experiments analyzing the volatile and organic compositions of sedimentary rock samples from Yellowknife Bay in Gale Crater, Mars. The samples were obtained using the Curiosity rover's drill. Analysis found the samples released water, carbon dioxide, sulfur dioxide, oxygen, and other gases when heated. The water and oxygen releases suggest the presence of hydrated minerals like phyllosilicates and oxychlorine compounds. Small amounts of organic compounds, including chlorinated hydrocarbons, were also detected, though the carbon source is uncertain. The sediments appear to have preserved evidence of past environmental conditions and potential habitability in Yellowknife Bay.
Introduction to Fault Scarps
This document provides an introduction to analyzing fault scarps to determine information about past earthquakes. It discusses different types of scarps, how scarp morphology evolves over time, and provides examples of scarps from past earthquakes. It also outlines methods for extracting scarp profiles, relating rupture length to earthquake magnitude, calculating recurrence intervals using erosion rates, and modeling hillslope diffusion of scarps over time.
Discovery of carbon_radio_recombination_lines_in_m82
Artigo que descreve a descoberta feita pelo LOFAR dos primeiros átomos de carbono fora da Via Láctea.
The petrochemistry of_jake_m_a_martian_mugearite
The rock "Jake_M" was the first rock analyzed by Curiosity on Mars. It has a distinct chemical composition compared to other known Martian rocks. Jake_M has a basaltic composition but is alkaline, with over 15% normative nepheline content. Its chemical makeup is similar to terrestrial mugearites, fractionated alkaline rocks found at ocean islands and rifts. This suggests Jake_M formed through extensive fractional crystallization of an alkaline magma at elevated pressure, possibly with water. The discovery of an alkaline rock expands the diversity of known Martian igneous compositions.
Cassini finds molecular hydrogen in the Enceladus plume: Evidence for hydroth...
Saturn’s moon Enceladus has an ice-covered ocean; a plume of material erupts from
cracks in the ice. The plume contains chemical signatures of water-rock interaction
between the ocean and a rocky core.We used the Ion Neutral Mass Spectrometer onboard
the Cassini spacecraft to detect molecular hydrogen in the plume. By using the instrument’s
open-source mode, background processes of hydrogen production in the instrument were
minimized and quantified, enabling the identification of a statistically significant signal of
hydrogen native to Enceladus.We find that the most plausible source of this hydrogen is
ongoing hydrothermal reactions of rock containing reduced minerals and organic materials.
The relatively high hydrogen abundance in the plume signals thermodynamic disequilibrium
that favors the formation of methane from CO2 in Enceladus’ ocean.
Elemental geochemistry of_sedimentary_rocks_at_yellowknife_bay_gale_crater_mars
The document summarizes the elemental geochemistry of sedimentary rocks analyzed by the Curiosity rover at Yellowknife Bay, Mars. Key findings include:
1) The rocks have compositions similar to iron-rich basalt and contain elevated levels of iron, chlorine, and calcium sulfate compared to most Martian soils.
2) Mineralogical analysis found phyllosilicates, magnetite, calcium sulfates, and an amorphous component in the mudstones.
3) Geochemical evidence suggests magnetite is likely a diagenetic mineral that formed after deposition rather than a detrital mineral delivered from another source.
4) Ternary diagrams of elemental compositions indicate secondary alteration minerals
Galaxy dynamics and the mass density of the universe
Dynamical evidence accumulated over the
past 20 years has convinced astronomers that luminous matter
in a spiral galaxy constitutes no more than 10% of the mass of
a galaxy. An additional 90% is inferred by its gravitational
effect on luminous material. Here I review recent observations
concerning the distribution of luminous and nonluminous
matter in the Milky Way, in galaxies, and in galaxy clusters.
Observations of neutral hydrogen disks, some extending in
radius several times the optical disk, confirm that a massive
dark halo is a major component of virtually every spiral. A
recent surprise has been the discovery that stellar and gas
motions in ellipticals are enormously complex. To date, only for
a few spheroidal galaxies do the velocities extend far enough to
probe the outer mass distribution. But the diverse kinematics
of inner cores, peripheral to deducing the overall mass distribution,
offer additional evidence that ellipticals have acquired
gas-rich systems after initial formation. Dynamical results are
consistent with a low-density universe, in which the required
dark matter could be baryonic. On smallest scales of galaxies
[10 kiloparsec (kpc); H. = 50 kmsec'lmegaparsec'11 the
luminous matter constitutes only 1% of the closure density. On
scales greater than binary galaxies (i.e., .100 kpc) all systems
indicate a density -10% of the closure density, a density
consistent with the low baryon density in the universe. If
large-scale motions in the universe require a higher mass
density, these motions would constitute the first dynamical
evidence for nonbaryonic matter in a universe of higher
density.
A 2 4_determination_of_the_local_value_of_the_hubble_constant
We use the Wide Field Camera 3 (WFC3) on the Hubble Space Telescope (HST) to
reduce the uncertainty in the local value of the Hubble constant from 3.3% to 2.4%.
The bulk of this improvement comes from new, near-infrared observations of Cepheid
variables in 11 host galaxies of recent type Ia supernovae (SNe Ia), more than doubling
the sample of reliable SNe Ia having a Cepheid-calibrated distance to a total of 19; these
in turn leverage the magnitude-redshift relation based on 300 SNe Ia at z <0.15. All
19 hosts as well as the megamaser system NGC4258 have been observed with WFC3
in the optical and near-infrared, thus nullifying cross-instrument zeropoint errors in the
relative distance estimates from Cepheids. Other noteworthy improvements include a
33% reduction in the systematic uncertainty in the maser distance to NGC4258, a larger
sample of Cepheids in the Large Magellanic Cloud (LMC), a more robust distance to
the LMC based on late-type detached eclipsing binaries (DEBs), HST observations of
Cepheids in M31, and new HST-based trigonometric parallaxes for Milky Way (MW)
Cepheids.
Ancient aqueous environments_at_endeavour_crater_mars
The document summarizes findings from the Mars Exploration Rover Opportunity regarding ancient aqueous environments at Endeavour Crater on Mars. CRISM orbital data identified a location with a spectral signature of Fe3+-rich smectite clay minerals. Opportunity investigated this area in detail called the Matijevic formation. It found fine-grained layered rocks containing spherical concretions and was cut by calcium sulfate veins. Composition data suggests the rocks formed from aqueous leaching that altered the rocks to aluminum-rich smectites. This provides evidence for water-rock interactions before and after the impact, under slightly acidic to neutral pH environments that could have been more favorable for prebiotic chemistry.
The ASTRODEEP Frontier Fields catalogues II. Photometric redshifts and rest f...
This document describes a public release of photometric redshifts and galaxy properties from multi-wavelength data in the Abell-2744 and MACS-J0416 galaxy cluster fields observed as part of the Frontier Fields program. Photometric redshifts were estimated using six different methods and have an accuracy of 3-5%. Accounting for gravitational lensing magnification, the H-band number counts agree with CANDELS at bright magnitudes but extend to intrinsically fainter galaxies of H=32-33. The Frontier Fields data allow probing galaxy stellar masses 0.5-1.5 dex lower than in wide fields, including sources with masses of 107-108 solar masses at z>5. Star formation rates can be detected 1
Evidence of rocky_planetesimals_orbiting_two_hyades_stars
This document summarizes evidence of rocky planetesimals orbiting two white dwarf stars (WD 0421+162 and WD 0431+126) that were originally intermediate-mass stars in the Hyades open star cluster. Hubble Space Telescope ultraviolet spectroscopy of the two white dwarfs detected silicon absorption lines, indicating ongoing accretion of silicon-rich material, along with upper limits on carbon that suggest the polluting material is more carbon-deficient than chondritic meteorites and thus rocky in composition. The observations are consistent with rocky planetesimals and small planets having formed around the two main-sequence progenitor stars in the Hyades, with the white dwarf descendants now showing signs of accretion from this planetary debris.
PROBING FOR EVIDENCE OF PLUMES ON EUROPA WITH HST/STIS
Roth et al. (2014a) reported evidence for plumes of water venting from a southern high latitude
region on Europa – spectroscopic detection of off-limb line emission from the dissociation
products of water. Here, we present Hubble Space Telescope (HST) direct images of Europa in
the far ultraviolet (FUV) as it transited the smooth face of Jupiter, in order to measure absorption
from gas or aerosols beyond the Europa limb. Out of ten observations we found three in which
plume activity could be implicated. Two show statistically significant features at latitudes similar
to Roth et al., and the third, at a more equatorial location. We consider potential systematic
effects that might influence the statistical analysis and create artifacts, and are unable to find any
that can definitively explain the features, although there are reasons to be cautious. If the
apparent absorption features are real, the magnitude of implied outgassing is similar to that of the
Roth et al. feature, however the apparent activity appears more frequently in our data.
Sequence stratigraphic analysis; methods & methodology
This document outlines the methodology for sequence stratigraphic analysis. It begins with background on key principles and concepts like facies, facies associations, and depositional environments. It then discusses various data sources and methods used in the analysis, including facies analysis using sedimentary petrography, ichnology, and paleocurrent directions. Additional methods covered are well logs, seismic data, age dating, and integrating these different data sources and analyses. The workflow progresses from initially evaluating the tectonic setting, to paleodepositional environments, to developing the detailed sequence stratigraphic framework. The goal is a unified, interdisciplinary analysis and interpretation of the stratigraphy.
A highly magnetized twin-jet base pinpoints a supermassive black hole
Supermassive black holes (SMBH) are essential for the production of jets in radio-loud active galactic nuclei (AGN). Theoretical
models based on (Blandford & Znajek 1977, MNRAS, 179, 433) extract the rotational energy from a Kerr black hole, which could
be the case for NGC1052, to launch these jets. This requires magnetic fields on the order of 103 G to 104 G. We imaged the vicinity
of the SMBH of the AGN NGC1052 with the Global Millimetre VLBI Array and found a bright and compact central feature that is
smaller than 1.9 light days (100 Schwarzschild radii) in radius. Interpreting this as a blend of the unresolved jet bases, we derive the
magnetic field at 1 Schwarzschild radius to lie between 200 G and 8:3 104 G consistent with Blandford & Znajek models.
What's hot (20)
Solar system exploration with space resources - Aiaa asm 2014_bp_9 final paper
Solar system exploration with space resources - Aiaa asm 2014_bp_9 final paper
An Earth-sized exoplanet with a Mercury-like composition
An Earth-sized exoplanet with a Mercury-like composition
Cold Molecular Gas in Merger Remnants. I. Formation of Molecular Gas Discs
Cold Molecular Gas in Merger Remnants. I. Formation of Molecular Gas Discs
In situ radiometric_and_exposure_age_dating_of_the_martian_surface
In situ radiometric_and_exposure_age_dating_of_the_martian_surface
49 collaboration with swedish deep drilling project dobson lbnl
49 collaboration with swedish deep drilling project dobson lbnl
Using the milk_way_satellites_to_study_interactions_between_cold_dark_matter_...
Using the milk_way_satellites_to_study_interactions_between_cold_dark_matter_...
Volatile and organic_composition_of_sedimentary_rocks_in_yellowknife_bay_gale...
Volatile and organic_composition_of_sedimentary_rocks_in_yellowknife_bay_gale...
Discovery of carbon_radio_recombination_lines_in_m82
Discovery of carbon_radio_recombination_lines_in_m82
Cassini finds molecular hydrogen in the Enceladus plume: Evidence for hydroth...
Cassini finds molecular hydrogen in the Enceladus plume: Evidence for hydroth...
Elemental geochemistry of_sedimentary_rocks_at_yellowknife_bay_gale_crater_mars
Elemental geochemistry of_sedimentary_rocks_at_yellowknife_bay_gale_crater_mars
Galaxy dynamics and the mass density of the universe
Galaxy dynamics and the mass density of the universe
A 2 4_determination_of_the_local_value_of_the_hubble_constant
A 2 4_determination_of_the_local_value_of_the_hubble_constant
Ancient aqueous environments_at_endeavour_crater_mars
Ancient aqueous environments_at_endeavour_crater_mars
The ASTRODEEP Frontier Fields catalogues II. Photometric redshifts and rest f...
The ASTRODEEP Frontier Fields catalogues II. Photometric redshifts and rest f...
Evidence of rocky_planetesimals_orbiting_two_hyades_stars
Evidence of rocky_planetesimals_orbiting_two_hyades_stars
PROBING FOR EVIDENCE OF PLUMES ON EUROPA WITH HST/STIS
PROBING FOR EVIDENCE OF PLUMES ON EUROPA WITH HST/STIS
Sequence stratigraphic analysis; methods & methodology
Sequence stratigraphic analysis; methods & methodology
A highly magnetized twin-jet base pinpoints a supermassive black hole
A highly magnetized twin-jet base pinpoints a supermassive black hole
Similar to Agu 2005
cggv_0000025472
The integrated study characterized the reservoir quality and stratigraphy of the Mowry Shale and Muddy Sandstone in the Powder River Basin. Five depositional facies were identified in the Muddy Sandstone based on core and well log analysis, with the cleanest reservoir sands found in tidal inlet and channel deposits. The overlying Mowry Shale consisted of three parasequences deposited in a restricted shelf environment. Seismic inversion and lithofacies modeling were used to map the facies distributions across the 3D seismic volume. The results provide insights into the stratigraphic framework and reservoir characteristics of the two plays to better assess their exploration potential.
Absar y Sreenivas, 2015.pdf
This document analyzes the petrology and geochemistry of greywacke sediments from the ~1.6 billion year old Middle Aravalli Supergroup in northwest India. Attributes of the greywackes such as poor sorting, angular framework grains, and variable chemical indexes suggest rapid erosion under an active tectonic regime. Geochemical signatures indicate the sediments were derived from a young differentiated continental arc rather than the older Archaean basement. Trace element patterns resemble modern continental arc magmas, suggesting a subduction zone setting for the precursor magmas. The sediments provide evidence for thick continental crust underlying the Middle Aravalli continental arc between 1772-1586 million years ago.
Abstract _Theresia
The document describes geochemical and geochronological analyses of volcanic rocks in the Barby Formation in southern Namibia. Key findings include:
1) The Barby Formation contains basaltic trachyandesites, trachydacites, and rhyolites with calc-alkaline geochemistry, suggesting emplacement in an active continental margin setting.
2) U-Pb dating of zircons from four samples yielded ages of 1213.7 ± 4.8 Ma for the Barby Formation and 1217 ± 3 Ma for the coeval Spes Bonasyenite.
3) Lu-Hf isotopic analyses indicate the units formed from a mixture of younger and older
What is the Age of the Earth?
The document discusses methods that scientists use to determine the age of the Earth. It explains that radiometric dating is used to measure the decay of radioactive isotopes in rocks and minerals to estimate their age. While this provides a means to directly date some igneous rocks, most rocks cannot be directly dated and must be bracketed between dated materials. The document reviews several examples of dated rocks and materials. Though radiometric dating provides a framework, determining the exact age of the Earth remains an ongoing effort as techniques are refined.
Geochemistry and Genesis of Kammatturu Iron Ores of Devagiri Formation, Sandu...
The Greenstone belts of Karnataka are enriched in BIFs in Dharwar craton, where Iron
formations are confined to the basin shelf, clearly separated from the deeper-water iron formation that
accumulated at the basin margin and flanking the marine basin. Geochemical data procured in terms of
major, trace and REE are plotted in various diagrams to interpret the genesis of BIFs. Al2O3, Fe2O3 (T),
TiO2, CaO, and SiO2 abundances and ratios show a wide variation. Ni, Co, Zr, Sc, V, Rb, Sr, U, Th,
ΣREE, La, Ce and Eu anomalies and their binary relationships indicate that wherever the terrigenous
component has increased, the concentration of elements of felsic such as Zr and Hf has gone up. Elevated
concentrations of Ni, Co and Sc are contributed by chlorite and other components characteristic of basic
volcanic debris. The data suggest that these formations were generated by chemical and clastic
sedimentary processes on a shallow shelf. During transgression, chemical precipitation took place at the
sediment-water interface, whereas at the time of regression. Iron ore formed with sedimentary structures
and textures in Kammatturu area, in a setting where the water column was oxygenated.
Massive sulfides
This document defines and describes volcanogenic massive sulphide (VMS) deposits. Key points:
- VMS deposits form from metal-rich hydrothermal fluids emitted from submarine volcanism. They typically occur as lenses of massive sulphides between volcanic and sedimentary rocks.
- Major deposits are found worldwide in volcanic terranes from 3.4 billion years ago to modern seafloor. Canada has over 350 deposits, providing 27-49% of its historical base metal production.
- Deposits range in size but the largest contain over 100 million tonnes of ore. Giant deposits include Neves Corvo in Portugal with over 270 million tonnes of ore containing 8.5 million tonnes of
Geochemistry and mineralogy of the campanian sandstone of
This document summarizes a study that analyzed the geochemistry and mineralogy of Campanian sandstones from the Lokoja-Basange Formation in the Anambra Basin in Nigeria. Twenty-six sandstone samples from two sections were investigated using mineralogical, geochemical, and pore water chemistry analyses. The results revealed quartz and kaolinite as major minerals, with the sandstones classified as mature lithic arenites and protoquartzites. Geochemical indices suggested intense chemical weathering and a felsic source rock. Discrimination diagrams placed the samples in active and passive continental margin settings. Low Cu/Zn ratios indicated deposition under oxidizing conditions. The study aimed to determine the provenance, tect
BCUR POSTER
The document summarizes the geology of the Isle of Raasay in Scotland. It describes the island's basement rocks as Lewisian gneiss formed over 3 billion years ago. Sediments from eroded mountain ranges were deposited as Torridonian Sandstone over 1 billion years ago. Younger Mesozoic sediments including Triassic, Jurassic and Cretaceous periods were deposited in various shallow marine to terrestrial environments. During the Cenozoic era, the region experienced volcanism and intrusions of basalt and granite. Glaciation during the Pleistocene sculpted the modern landscape and deposited till.
Unique meteorite from_early_amazonian_mars_water_rich_basaltic_breccia_northw...
1) NWA 7034 is a 319.8g martian meteorite found in Morocco in 2011. It is a porous basaltic breccia composed of feldspar and pyroxene phenocrysts in a fine-grained groundmass containing magnetite.
2) Chemical and isotopic analyses indicate NWA 7034 formed on Mars 2.089 billion years ago from a geochemically enriched crustal source. It contains over 6000ppm water, more than most martian meteorites.
3) NWA 7034's composition is unlike SNC meteorites but matches basalts analyzed at Gusev Crater and the average martian crust measured by orbiters, providing the
Unique Meteorite from Early Amazonian Mars: Water-Rich Basaltic Breccia North...
1) NWA 7034 is a 319.8g martian meteorite found in Morocco in 2011. It is a porous basaltic breccia composed of feldspar and pyroxene phenocrysts in a fine-grained groundmass.
2) Chemical and isotopic analyses indicate it formed on Mars 2.089 billion years ago from a magma enriched in the martian crust. It contains over 6000ppm water, more than most martian meteorites.
3) NWA 7034 matches basalts analyzed at Gusev Crater by the Mars Exploration Rover and the average martian crust measured by orbiters, unlike other martian meteorites. Its composition suggests
Final Thesis AM Borst -26 august 2012
This document provides background information on the Kalahari Craton in southern Africa, which consists of the Archaean Zimbabwe and Kaapvaal Cratons separated by the Limpopo Mobile Belt. It discusses the geological history and tectonic setting of the craton and its constituent terranes. The focus is on peridotite xenoliths from the Letlhakane kimberlite mine in northern Botswana, which will be studied to characterize the sub-cratonic lithospheric mantle beneath this region and better understand its origin and modification over time. A variety of analytical techniques will be used, including petrography, geochemistry, and Sm-Nd and Lu-Hf isotope analyses
Evidence for a_complex_enrichment_history_of_the_stream_from_fairall_9_sightline
This study analyzes absorption spectra of the Magellanic Stream (MS) toward the quasar Fairall 9, obtained using the Hubble Space Telescope Cosmic Origins Spectrograph (HST/COS) and the Very Large Telescope Ultraviolet and Visible Echelle Spectrograph (VLT/UVES). The spectra reveal absorption from multiple velocity components of the MS, indicating multiphase gas. Surprisingly, the sulfur abundance is found to be high ([S/H] = -0.30), five times higher than other MS sightlines, while the nitrogen abundance is lower ([N/H] = -1.15). This points to a complex enrichment history, where the gas toward Fair
Krof property fact sheet 20120121
The Krof property targets two types of mineral deposits - a volcanogenic massive sulfide (VMS) deposit hosting copper, zinc, silver and gold, and an ultramafic-hosted nickel, copper, cobalt and platinum group element deposit similar to the nearby historic Giant Mascot Mine. Exploration at Krof since the 1980s has identified VMS mineralization at the main zone with drilling intersecting up to 4.82% copper and 19.94 g/t silver. Geophysical surveys have also identified additional electromagnetic anomalies across the property that remain untested targets. The property is available for option and further exploration is recommended to test priority drill targets at the main VMS zone and electromagnetic and geochemical anomalies elsewhere that may
Localized aliphatic organic material on the surface of Ceres
This document summarizes research on the detection of organic material on the surface of the dwarf planet Ceres. Spectral data from the Dawn spacecraft's VIR instrument shows a clear detection of an organic absorption feature at 3.4 micrometers localized near the Ernutet crater on Ceres. This signature is characteristic of aliphatic organic matter. The presence of organics as well as other compounds like ammonia-bearing minerals, water ice, carbonates and salts indicates a complex chemical environment on Ceres that could be favorable for prebiotic chemistry. The organics are concentrated in a 1000 square kilometer region near Ernutet crater, and their origin is unclear but may be from an impactor or endogenous to Ceres
Curiosity
The document summarizes information about the Mars Curiosity rover mission. It describes Curiosity's goals of investigating Martian climate, geology, and assessing habitability. It details Curiosity's landing site in Gale Crater and comparisons to previous Mars rovers. Curiosity uses a supersonic parachute during its descent through the thin Martian atmosphere to slow its descent, which involves complex fluid structure interaction challenges.
Nature, formation, and distribution of carbonates on CeresNature, formation, ...
Different carbonates have been detected on Ceres, and their abundance and spatial distribution have been mapped
using a visible and infrared mapping spectrometer (VIR), the Dawn imaging spectrometer. Carbonates are abundant
and ubiquitous across the surface, but variations in the strength and position of infrared spectral absorptions indicate
variations in the composition and amount of these minerals. Mg-Ca carbonates are detected all over the surface, but
localized areas show Na carbonates, such as natrite (Na2CO3) and hydrated Na carbonates (for example, Na2CO3·H2O).
Their geological settings and accessory NH4-bearing phases suggest the upwelling, excavation, and exposure of salts
formed from Na-CO3-NH4-Cl brine solutions at multiple locations across the planet. The presence of the hydrated
carbonates indicates that their formation/exposure on Ceres’ surface is geologically recent and dehydration to the
anhydrous form (Na2CO3) is ongoing, implying a still-evolving body.
Wang_et_al_EPSL_V430(2015)
This document discusses iron isotope measurements of lunar samples, including the oldest lunar rock dunite 72 415. The key points are:
1) Dunite 72 415 has a surprisingly light iron isotope composition, in contrast to other lunar samples which are enriched in heavy iron isotopes compared to Earth.
2) Additional measurements of dunite 72 415 confirm this light iron isotope signature.
3) The earliest olivine accumulation in the lunar magma ocean may have been enriched in light iron isotopes, allowing the overall iron isotope composition of the Moon to match that of Earth.
4296
The document summarizes the analysis of layered deposits inside the 174 km diameter Terby impact crater located on Mars. Stratigraphic and mineralogical analysis using multiple datasets suggests the deposits were formed subaqueously during the Noachian period. The thickest sequences display fan delta morphologies indicative of prograding/onlapping sedimentation over time. Phyllosilicates detected within layers support a sedimentary environment with sustained liquid water. Erosion during the Hesperian sculpted the current landforms, with later fluvial and then aeolian activity. Terby crater thus preserves a geologic record spanning multiple periods of Mars' history.
2015 Broken Hill Resources Investment Symposium - Carpentaria Exploration - M...
" Iron Mineralisation in NeoProterzoic".
Michael Tschaban, Geologist, Carpentaria Exploration.
Technical presentation at 2015 Broken Hill Resources Investment symposium.
7.Greenfield_MnW2015_abstract_edit6 (1)
The document provides an overview of metalliferous basins in New South Wales that host lead-zinc and other base metal deposits. It discusses the Broken Hill basin, which contains the giant Broken Hill deposit, as well as other significant basins such as the Ponto Group, Girilambone District, and Cobar Basin. The Broken Hill deposit formed during the rift phase of basin development from exhalative and inhalative processes, aided by an elevated geotherm from magmatic underplating. Other examples like the Ponto Group contain smaller Besshi-type copper deposits that formed from seafloor exhalative processes in an oceanic fore-arc setting. The document analyzes factors important for
Similar to Agu 2005 (20)
Geochemistry and Genesis of Kammatturu Iron Ores of Devagiri Formation, Sandu...
Geochemistry and Genesis of Kammatturu Iron Ores of Devagiri Formation, Sandu...
Geochemistry and mineralogy of the campanian sandstone of
Geochemistry and mineralogy of the campanian sandstone of
Unique meteorite from_early_amazonian_mars_water_rich_basaltic_breccia_northw...
Unique meteorite from_early_amazonian_mars_water_rich_basaltic_breccia_northw...
Unique Meteorite from Early Amazonian Mars: Water-Rich Basaltic Breccia North...
Unique Meteorite from Early Amazonian Mars: Water-Rich Basaltic Breccia North...
Evidence for a_complex_enrichment_history_of_the_stream_from_fairall_9_sightline
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June Patch Tuesday
Ivanti’s Patch Tuesday breakdown goes beyond patching your applications and brings you the intelligence and guidance needed to prioritize where to focus your attention first. Catch early analysis on our Ivanti blog, then join industry expert Chris Goettl for the Patch Tuesday Webinar Event. There we’ll do a deep dive into each of the bulletins and give guidance on the risks associated with the newly-identified vulnerabilities.
Webinar: Designing a schema for a Data Warehouse
Are you new to data warehouses (DWH)? Do you need to check whether your data warehouse follows the best practices for a good design? In both cases, this webinar is for you.
A data warehouse is a central relational database that contains all measurements about a business or an organisation. This data comes from a variety of heterogeneous data sources, which includes databases of any type that back the applications used by the company, data files exported by some applications, or APIs provided by internal or external services.
But designing a data warehouse correctly is a hard task, which requires gathering information about the business processes that need to be analysed in the first place. These processes must be translated into so-called star schemas, which means, denormalised databases where each table represents a dimension or facts.
We will discuss these topics:
- How to gather information about a business;
- Understanding dictionaries and how to identify business entities;
- Dimensions and facts;
- Setting a table granularity;
- Types of facts;
- Types of dimensions;
- Snowflakes and how to avoid them;
- Expanding existing dimensions and facts.
Choosing The Best AWS Service For Your Website + API.pptx
Have you ever been confused by the myriad of choices offered by AWS for hosting a website or an API?
Lambda, Elastic Beanstalk, Lightsail, Amplify, S3 (and more!) can each host websites + APIs. But which one should we choose?
Which one is cheapest? Which one is fastest? Which one will scale to meet our needs?
Join me in this session as we dive into each AWS hosting service to determine which one is best for your scenario and explain why!
HCL Notes und Domino Lizenzkostenreduzierung in der Welt von DLAU
Webinar Recording: https://www.panagenda.com/webinars/hcl-notes-und-domino-lizenzkostenreduzierung-in-der-welt-von-dlau/
DLAU und die Lizenzen nach dem CCB- und CCX-Modell sind für viele in der HCL-Community seit letztem Jahr ein heißes Thema. Als Notes- oder Domino-Kunde haben Sie vielleicht mit unerwartet hohen Benutzerzahlen und Lizenzgebühren zu kämpfen. Sie fragen sich vielleicht, wie diese neue Art der Lizenzierung funktioniert und welchen Nutzen sie Ihnen bringt. Vor allem wollen Sie sicherlich Ihr Budget einhalten und Kosten sparen, wo immer möglich. Das verstehen wir und wir möchten Ihnen dabei helfen!
Wir erklären Ihnen, wie Sie häufige Konfigurationsprobleme lösen können, die dazu führen können, dass mehr Benutzer gezählt werden als nötig, und wie Sie überflüssige oder ungenutzte Konten identifizieren und entfernen können, um Geld zu sparen. Es gibt auch einige Ansätze, die zu unnötigen Ausgaben führen können, z. B. wenn ein Personendokument anstelle eines Mail-Ins für geteilte Mailboxen verwendet wird. Wir zeigen Ihnen solche Fälle und deren Lösungen. Und natürlich erklären wir Ihnen das neue Lizenzmodell.
Nehmen Sie an diesem Webinar teil, bei dem HCL-Ambassador Marc Thomas und Gastredner Franz Walder Ihnen diese neue Welt näherbringen. Es vermittelt Ihnen die Tools und das Know-how, um den Überblick zu bewahren. Sie werden in der Lage sein, Ihre Kosten durch eine optimierte Domino-Konfiguration zu reduzieren und auch in Zukunft gering zu halten.
Diese Themen werden behandelt
- Reduzierung der Lizenzkosten durch Auffinden und Beheben von Fehlkonfigurationen und überflüssigen Konten
- Wie funktionieren CCB- und CCX-Lizenzen wirklich?
- Verstehen des DLAU-Tools und wie man es am besten nutzt
- Tipps für häufige Problembereiche, wie z. B. Team-Postfächer, Funktions-/Testbenutzer usw.
- Praxisbeispiele und Best Practices zum sofortigen Umsetzen
Your One-Stop Shop for Python Success: Top 10 US Python Development Providers
Simplify your search for a reliable Python development partner! This list presents the top 10 trusted US providers offering comprehensive Python development services, ensuring your project's success from conception to completion.
5th LF Energy Power Grid Model Meet-up Slides
5th Power Grid Model Meet-up
It is with great pleasure that we extend to you an invitation to the 5th Power Grid Model Meet-up, scheduled for 6th June 2024. This event will adopt a hybrid format, allowing participants to join us either through an online Mircosoft Teams session or in person at TU/e located at Den Dolech 2, Eindhoven, Netherlands. The meet-up will be hosted by Eindhoven University of Technology (TU/e), a research university specializing in engineering science & technology.
Power Grid Model
The global energy transition is placing new and unprecedented demands on Distribution System Operators (DSOs). Alongside upgrades to grid capacity, processes such as digitization, capacity optimization, and congestion management are becoming vital for delivering reliable services.
Power Grid Model is an open source project from Linux Foundation Energy and provides a calculation engine that is increasingly essential for DSOs. It offers a standards-based foundation enabling real-time power systems analysis, simulations of electrical power grids, and sophisticated what-if analysis. In addition, it enables in-depth studies and analysis of the electrical power grid’s behavior and performance. This comprehensive model incorporates essential factors such as power generation capacity, electrical losses, voltage levels, power flows, and system stability.
Power Grid Model is currently being applied in a wide variety of use cases, including grid planning, expansion, reliability, and congestion studies. It can also help in analyzing the impact of renewable energy integration, assessing the effects of disturbances or faults, and developing strategies for grid control and optimization.
What to expect
For the upcoming meetup we are organizing, we have an exciting lineup of activities planned:
-Insightful presentations covering two practical applications of the Power Grid Model.
-An update on the latest advancements in Power Grid -Model technology during the first and second quarters of 2024.
-An interactive brainstorming session to discuss and propose new feature requests.
-An opportunity to connect with fellow Power Grid Model enthusiasts and users.
Salesforce Integration for Bonterra Impact Management (fka Social Solutions A...
Sidekick Solutions uses Bonterra Impact Management (fka Social Solutions Apricot) and automation solutions to integrate data for business workflows.
We believe integration and automation are essential to user experience and the promise of efficient work through technology. Automation is the critical ingredient to realizing that full vision. We develop integration products and services for Bonterra Case Management software to support the deployment of automations for a variety of use cases.
This video focuses on integration of Salesforce with Bonterra Impact Management.
Interested in deploying an integration with Salesforce for Bonterra Impact Management? Contact us at sales@sidekicksolutionsllc.com to discuss next steps.
AI 101: An Introduction to the Basics and Impact of Artificial Intelligence
Imagine a world where machines not only perform tasks but also learn, adapt, and make decisions. This is the promise of Artificial Intelligence (AI), a technology that's not just enhancing our lives but revolutionizing entire industries.
Introduction of Cybersecurity with OSS at Code Europe 2024
I develop the Ruby programming language, RubyGems, and Bundler, which are package managers for Ruby. Today, I will introduce how to enhance the security of your application using open-source software (OSS) examples from Ruby and RubyGems.
The first topic is CVE (Common Vulnerabilities and Exposures). I have published CVEs many times. But what exactly is a CVE? I'll provide a basic understanding of CVEs and explain how to detect and handle vulnerabilities in OSS.
Next, let's discuss package managers. Package managers play a critical role in the OSS ecosystem. I'll explain how to manage library dependencies in your application.
I'll share insights into how the Ruby and RubyGems core team works to keep our ecosystem safe. By the end of this talk, you'll have a better understanding of how to safeguard your code.
Columbus Data & Analytics Wednesdays - June 2024
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Main news related to the CCS TSI 2023 (2023/1695)
An English 🇬🇧 translation of a presentation to the speech I gave about the main changes brought by CCS TSI 2023 at the biggest Czech conference on Communications and signalling systems on Railways, which was held in Clarion Hotel Olomouc from 7th to 9th November 2023 (konferenceszt.cz). Attended by around 500 participants and 200 on-line followers.
The original Czech 🇨🇿 version of the presentation can be found here: https://www.slideshare.net/slideshow/hlavni-novinky-souvisejici-s-ccs-tsi-2023-2023-1695/269688092 .
The videorecording (in Czech) from the presentation is available here: https://youtu.be/WzjJWm4IyPk?si=SImb06tuXGb30BEH .
OpenID AuthZEN Interop Read Out - Authorization
During Identiverse 2024 and EIC 2024, members of the OpenID AuthZEN WG got together and demoed their authorization endpoints conforming to the AuthZEN API
Building Production Ready Search Pipelines with Spark and Milvus
Spark is the widely used ETL tool for processing, indexing and ingesting data to serving stack for search. Milvus is the production-ready open-source vector database. In this talk we will show how to use Spark to process unstructured data to extract vector representations, and push the vectors to Milvus vector database for search serving.
Fueling AI with Great Data with Airbyte Webinar
This talk will focus on how to collect data from a variety of sources, leveraging this data for RAG and other GenAI use cases, and finally charting your course to productionalization.
National Security Agency - NSA mobile device best practices
Threats to mobile devices are more prevalent and increasing in scope and complexity. Users of mobile devices desire to take full advantage of the features
available on those devices, but many of the features provide convenience and capability but sacrifice security. This best practices guide outlines steps the users can take to better protect personal devices and information.
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