Mineralogical Ambiguity of Lonar EjectaOlympus IMS
Abstract
The comparatively young (50,000 years old) Lonar crater of India is presumably one of the two known terrestrial impact craters that emplaced about 65 million years old Deccan basalt. The impact cratering occurred tens of million years after the formation of the Deccan Basalt and it is very likely that in the meantime the postulated target basalts layers were extensively altered due to weathering. Detailed mineralogical analysis of 6 (six) ejecta samples by XRD (using both Cu and Co source), SEM-EDS revealed that the mineral assemblage of the ejecta primarily consists of andesine [(Na,Ca)(Si,Al)4O8], diopside [CaMgSi2O6], augite [(Ca,Na)(Mg,Fe,Al,Ti)(Si,Al)2O6], carbonates [calcite (CaCO3) and magnesite (MgCO3)]; along with trace amount of magnetite (Fe2O4), hematite (Fe2O3) and low-silica zeolite formed due to low temperature (70o) alteration of low-silica rocks. The prevalence of andesine presents some ambiguity in matching the ejecta with tholeiitic basaltic target and suggest that multiple phases of pre and post-impact alterations probably accountable for the present mineralogical assemblage. The impact cratering probably occurred on the weathered basaltic rocks that was depleted in certain metals and the zeolites probably developed due to post-impact hydrothermal alteration and finally climatic condition probably facilitated the calcification of the ejecta blanket and the preservation of the ejecta fallout.
Presentation on Solar System for primary level students.
Solar system is the collection of eight planets and their moons in orbit round the sun, together with smaller bodies in the form of asteroids, meteoroids, and comets.
Mineralogical Ambiguity of Lonar EjectaOlympus IMS
Abstract
The comparatively young (50,000 years old) Lonar crater of India is presumably one of the two known terrestrial impact craters that emplaced about 65 million years old Deccan basalt. The impact cratering occurred tens of million years after the formation of the Deccan Basalt and it is very likely that in the meantime the postulated target basalts layers were extensively altered due to weathering. Detailed mineralogical analysis of 6 (six) ejecta samples by XRD (using both Cu and Co source), SEM-EDS revealed that the mineral assemblage of the ejecta primarily consists of andesine [(Na,Ca)(Si,Al)4O8], diopside [CaMgSi2O6], augite [(Ca,Na)(Mg,Fe,Al,Ti)(Si,Al)2O6], carbonates [calcite (CaCO3) and magnesite (MgCO3)]; along with trace amount of magnetite (Fe2O4), hematite (Fe2O3) and low-silica zeolite formed due to low temperature (70o) alteration of low-silica rocks. The prevalence of andesine presents some ambiguity in matching the ejecta with tholeiitic basaltic target and suggest that multiple phases of pre and post-impact alterations probably accountable for the present mineralogical assemblage. The impact cratering probably occurred on the weathered basaltic rocks that was depleted in certain metals and the zeolites probably developed due to post-impact hydrothermal alteration and finally climatic condition probably facilitated the calcification of the ejecta blanket and the preservation of the ejecta fallout.
Presentation on Solar System for primary level students.
Solar system is the collection of eight planets and their moons in orbit round the sun, together with smaller bodies in the form of asteroids, meteoroids, and comets.
A comprehensive study of Geography for PCS examination
This module is very helpful for the Students who are preparing for the Competitive Examination Like UPSC, BPSC & other State Public Service Commission.
2. MADE BY- RIYA JOSHI
GROUP -1
MEMBERS- SAMRIDDHI
BANERJI, DHRUV
GUJAR , DIKSHA
INGLE , POSH SAFAYA,
RIYA JOSHI
CLASS – VIIIC
GUIDED BY – SHEPHALI
MAM
3.
4. SOLAR SYSTEM.....?
THE SOLAR SYSTEM
WAS FORMED ABOUT
4560 MILLION
TEARS AGO. IT IS
MADE UP OF THE
EIGHT PLANETS-MERCURY
,
VENUS , EARTH ,
MARS , SATURN ,
JUPITER,
URANUS,
NEPTUNE AND AS
WELL AS THEIR
MOONS , COMETS,
AN OTHER BODIES .
THESE ALL ORBIT
AROUND THE SUN.
LETS STUDY ABOUT
ITS MEMBERS..........
5. THE SUN
SUN IS THE NEAREST STAR FROM US. ITS
MASS IS EQUIVALENT TO 99.98% OF THE
MASS OF THE ENTIRE SOLAR SYSTEM
ELEMENTS. IT IS MOSTLY MADE UP OF
TWO LIGHT GASES 75% HYDROGEN, AND
23%HELIUM WITH RELATIVELY SMALL
QUANTITIES OF OTHER ELEMENTS SUCH
AS GOLD. IT HAS A SURFACE
TEMPERATURE OF 5880K(KELVIN). IT
SPIN AT A DIFFERENT RATE.
6. THE PLANETS
A CELESTIAL BODY MOVING IN AN
ELLIPTICAL ORBIT ROUND A STAR IS
CALLED A PALNET . PLANETS DO NOT
TWINKLE AND KEEP CHANGING THEIR
POSITIONS WITH RESPECT TO STARS .
7. MERCURY MERCURY IS AN SMALL ROCKY PLANET WHOSE
SURFACE HAS BEEN HEAVILY CRATERED BY
METEORITES . THE SURFACE ALSO HAS MANY
RIDGES CALLED RUPES, YHAT ARE BELIEVED TO
HAVE FORMED
AS THE CORE OF THE YOUNG PLANET COOLED
AND SHRANK. MERCURY MOVES FASTER THAN
ANY OTHER PLANET. SURFACE TEMPERATURE
ON THE PLANET
IS 430C ON T5HE SUNLIT SIDE AND -170 ON THE
DARKER SIDE.
8. VENUS
VENUS IS SLIGHTLY
SMALLER THAN THE
EARTH AND PROBABLY
WITH A SIMILAR
INTERNAL STRUCTURE
OF A PARTLY MOLTEN
METAL CORE
SURROUNDED BY A
ROCKY MANTLE AND
CRUST. BEING THE
HOTTEST PLANET OF
OUR SOLAR SYSTEM IT
HAS A SURFACE
TEMPERATURE OF 480C.
IT ROTATES FROM EAST
TO WEST AND HAS NO
MOON OF ITS OWN.
9. EARTH
THE FIFTH LARGEST PLANET
IN THE SOLAR SYSTEM. THE
EARTH IS THE ONLY PLANET
TO SUPPORT LIFE. THE AXIS
OF THE ROTATION OF THE
EARTH IS NOT
PERPENDICULAR TO THE
PLANE OF ITS ORBIT. THE
EARTH ONLY ONE MOON. ITS
ATMOSPHERE IS PROTECTED
WITH A LAYER OF OZONE.
10. MARS
MARS IS ALSO KNOWN AS THE
RED PLANET BECAUSE OF THE
RED IRON OXIDE DUST THAT
COVERS ITS SURFACE. IT IS
ORBITED BY TWO TINY MOONS
PHOBOS, DEIMOS.
11. JUPITER
JUPITER IS THE LARGEST MOST
MASSIVE PLANET OF THE SOLAR
SYSTEM.IT HAS TWO FAINT
RINGS, AND IT IS ORBITED BY ITS
16 KNOWN MOONS. ITS AVERAGE
TEMPERATURE IS +14.85 TO +19.85.
12. SATURN
SATURN IS THE SECOND
LARGEST PLANET IN THE
SOLAR SYSTEM BUT THE
LEAST DENSE. ITS
DINSTINCTIVE RINGS ARE
MADE OF ICE AND ROCK
WHICH WERE PROBABLY
PARTS OF COMETS AND
ASTERIODS. IT APPEARS
YELLOWISH IN COLOUR.
13. URANUS
URANUS IS THE THIRD LARGEST
PLANET IN THE SOLAR SYSTEM.
IT IS A COLD GAS GIANT
BELIEVED TO CONSIST OF A
MIXTURE OF GAS AND ICE
AROUND A SOLID CORE.
URANUS IS TILTED AT 97.9 AND
SO ROLLS ON ITS SIDE ALONG
ITS ORBITAL PATH. IT HAS 15
MOONS 10 FAINT RINGS AND A
BROAD RING OF DUST.,
14. NEPTUNE
THE NEPTUNE IS BELIEVED TO CONSIST OF A SMALL
SOLID CORE SURRUONDED BY A MIXTURE OF
LIQUIDS AND GASES . IT HAS FOUR UNSTABLE RINGS
AND 8 KNOWN MOONS.
15.
16. rules
THERE SHOULD BE SILENCE AND
DISCIPLINE MAINTAINED DURING QUIZ
IF NOT 1 MARKS WILL BE DEDUCTED
3 MARKS WILL BE GIVEN FOR EVERY
CORRECT ANSWER
25 SECONDS WILL BE GIVEN TO
ANSWER THE QUESTION
2 MARKS FOR BONUS
POINT
25. WHICH OF THESE IS NOT A STAR?
SUN SIRIUS
ALPHA CENTURY URANUS
26. WHICH OF THESE ABOUT POLE
STAR IS FALSE
IT EXISTS ON NORTH
POLE OF THE EARTH
IT IS SITUATED IN THE DIRECTION OF THE
EARTH AXIS
IT DOES NOT APPEAR
TO MOVE
ITIS LOCATED IN LINE WITH
THREE MIDDLE STARS OF
ORION
