This chapter discusses sedimentary rocks and the processes involved in their formation. It describes how clastic and chemical sediments are formed from weathering and precipitation, respectively, and how they are transported, deposited, and lithified into sedimentary rocks. Clastic sediments like gravel, sand, silt and clay are sorted by size and shape during transport. Chemical sediments form through inorganic precipitation or biochemical processes. Sedimentary structures and fossils within the rocks provide clues about the depositional environment. Compaction and cementation convert sediments into solid sedimentary rocks such as sandstone, siltstone, mudstone, conglomerate and various chemical rocks.
Sedimentary texture can be useful in interpreting the mechanisms and environment of deposition. It also has major control over the porosity and permeability of sediment.
All Igneous rock textures with examples in easy and simple way to understand and increase microscopic studies skills and the way to easily identify igneous rocks under polarized microscope.
Sedimentary texture can be useful in interpreting the mechanisms and environment of deposition. It also has major control over the porosity and permeability of sediment.
All Igneous rock textures with examples in easy and simple way to understand and increase microscopic studies skills and the way to easily identify igneous rocks under polarized microscope.
Silica polymerization in igneous processes.Ahmed Tarek
Silicate Polymerization In Igneous Processes.
Introduction:
Magma is very hot liquid of molten rocks (often mantle derived melt) and contain other constituents like gases , volatiles and solid suspended crystals where magma exist into deep plutinic huge chambers. While Lava is a magma but extruded onto the earth by (volcanic eruption) or from (earth fissure).
Most evaporites are derived from bodies of Sea-water, but under special conditions, Inland lakes may also give rise to evaporite deposits, particularly in regions of low rainfall and high temperature.
Evaporite deposits are excellent indicators of paleoclimate (need a hot and arid climate for major evaporite deposits to form)
Komattite
Named after the Komati River in South Africa.
first described by Morris and Richard (twins) for ultramafic units in the Barberton Greenstone belt of South Africa.
Mostly of komatiite are Archean age
distributed in the Archaean shield areas.
Also a few are Proterozoic and Phanerozoic.
In all ages komatiites are highly magnesium.
Mostly a volcanic rock; occasionally intrusive.
Mafic rocks were identified as extrusive because of their volcanic textures and structures, and they seem to have been accepted as a normal component of Archean volcanic successions, Abitibi in Canada.
The ultramafic rocks were interpreted as intrusive which are founded as sills and dykes, Barberton in South Africa.
Spinifex texture-typical of Komatiites:
Silica polymerization in igneous processes.Ahmed Tarek
Silicate Polymerization In Igneous Processes.
Introduction:
Magma is very hot liquid of molten rocks (often mantle derived melt) and contain other constituents like gases , volatiles and solid suspended crystals where magma exist into deep plutinic huge chambers. While Lava is a magma but extruded onto the earth by (volcanic eruption) or from (earth fissure).
Most evaporites are derived from bodies of Sea-water, but under special conditions, Inland lakes may also give rise to evaporite deposits, particularly in regions of low rainfall and high temperature.
Evaporite deposits are excellent indicators of paleoclimate (need a hot and arid climate for major evaporite deposits to form)
Komattite
Named after the Komati River in South Africa.
first described by Morris and Richard (twins) for ultramafic units in the Barberton Greenstone belt of South Africa.
Mostly of komatiite are Archean age
distributed in the Archaean shield areas.
Also a few are Proterozoic and Phanerozoic.
In all ages komatiites are highly magnesium.
Mostly a volcanic rock; occasionally intrusive.
Mafic rocks were identified as extrusive because of their volcanic textures and structures, and they seem to have been accepted as a normal component of Archean volcanic successions, Abitibi in Canada.
The ultramafic rocks were interpreted as intrusive which are founded as sills and dykes, Barberton in South Africa.
Spinifex texture-typical of Komatiites:
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d. Describe processes that change rocks and the surface of the earth.
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4. Sedimentary RocksSedimentary Rocks
• Clastic ( or detrital) sedimentary rocks reflect
several processes.
– Weathering – Generation of detritus via rock
disintegration.
– Erosion – Removal of sediment grains from rock.
– Transportation – Dispersal by wind, water and ice.
– Deposition – Accumulation after cessation of
transport.
– Lithification – Transformation into solid rock.
• Burial – Continued deposition buries sediments.
• Compaction – Squeezing by the weight overlying material.
• Cementation – Grains “glued” by pore-filling minerals.
5. Sediments In The Rock CycleSediments In The Rock Cycle
• Sediments are transported by:
– Water.
– Ice.
– Wind.
– Gravity.
• The transport and deposition of sediments
are initial phases of the rock cycle.
• The ultimate fate of most sediment is burial
and conversion to sedimentary rock.
6. Sediments Types AndSediments Types And
CharacteristicsCharacteristics
• Three broad classes:
– Clastic sediment is loose fragments of rock
debris produced by physical weathering.
– Chemical sediment precipitates from solution in
water.
– Biochemical/Biogenic/Bioclastic sediment is
composed of the fossilized remains of plants or
animals.
7. Characteristics of ClasticCharacteristics of Clastic
Sediment (1)Sediment (1)
• Clastic sediment is divided into four
main size classes:
– Gravel and larger ( 2mm and larger)
– Sand (0.0625 to 2 mm)
– Silt (0.0625 to 0.0039 mm)
– Clay (less than 0.0039 mm)
9. SortingSorting
• Sorting identifies sediment in terms of
the variability in the size of its particles.
– Poorly sorted (wide range of particle size),
– Well sorted (range is small).
• Changes of grain size typically result
from fluctuations in the velocity of the
transporting agent, such as water or
wind.
12. SortingSorting
• The greater the speed and energy
involved, the larger or heavier are the
particles that can be transported.
13. SortingSorting
• Nonsorted sediment is a mixture of
different sizes arranged chaotically.
– Till is a nonsorted sediment of glacial
origin.
• Smooth and rounded particles are
transported by water or air.
16. Characteristics of ChemicalCharacteristics of Chemical
SedimentsSediments
• Chemical sediments are formed by precipitation of
minerals from solution in water.
• They form in two principal ways:
– Through biochemical reactions resulting from the
activity of plants and animals in the water.
– Inorganic reactions in the water.
• When water from a hot spring cools, it may
precipitate opal (a hydrated silicate) or calcite
(calcium carbonate).
18. SaltsSalts
• Evaporation of sea water or lake water
forms salts.
• Lake waters precipitate sodium
carbonate (Na2CO3), sodium sulfate
Na2SO4), borax (Na2B4O7.10H2O),and trona
(Na2CO3.NaHCO3.2H2O).
21. Sedimentary or DepostionalSedimentary or Depostional
EnvironmentsEnvironments
• Each environment will have distinctive
physical, chemical, and biological
characteristics.
24. How Sediment Becomes RockHow Sediment Becomes Rock
• Lithification is the overall process of
creating sedimentary rock.
25. How Sediment Becomes RockHow Sediment Becomes Rock
• Processes involved include:
– Compaction.
• As the weight of an accumulating sediment forces the
grains together. The pore space is reduced.
– Cementation.
• Substances dissolved in water precipitate to form a
cement that binds the sediment grains together.
26. What do we call theseWhat do we call these
rocks?rocks?
27. Clastic Sedimentary RocksClastic Sedimentary Rocks
• The four basic classes of clastic
sedimentary rocks are:
– Conglomerate/Breccia, a lithified gravel.
– Sandstone, consisting mainly of sand grains.
– Siltstone, composed mainly of silt-size mineral
fragments, commonly quartz and feldspar.
– Mudstone, still-finer grain size.
33. Chemical Sedimentary RocksChemical Sedimentary Rocks
• Chemical sedimentary rocks result from
Lithification of organic or inorganic
chemical precipitates.
41. Environmental clues inEnvironmental clues in
sedimentary rockssedimentary rocks
• Sedimentary rocks reflect the environment
in which they were formed.
• Clues from bedding planes.
– Ripples marks preserved in sandstones and
siltstones.
– Footprints, trails, and raindrop impressions.
42. Clues in the RocksClues in the Rocks
• Clues from fossils.
– Some animals and plants are restricted to
warm, moist climates, whereas others are
associated only with cold, dry climates.