Carbon, oxygen and nitrogen isotopic compositions of possible Martian weathering products in EETA 79001

Details Carbon, oxygen and nitrogen isotopic compositions of possible Martian weathering products in EETA 79001 Carbon, oxygen and nitrogen isotopic compositions of possible Martian weathering products in EETA 79001

Apr 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988gecoa..52..917w&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 52, April 1988, p. 917-924. SERC-supported research.

Computer Science

16

Calcium Carbonates, Carbon Isotopes, Mars Atmosphere, Meteoritic Composition, Nitrogen Isotopes, Oxygen Isotopes, Gas Evolution, Igneous Rocks, Meteorites, Carbon, Oxygen, Nitrogen, Isotopes, Composition, Eeta 79001, Eet Meteorites, Antarctic Meteorites, Parent Bodies, Mars, Weathering, Samples, Meteorites, Laboratory Studies, Shergottites, Origin, Source, Carbonates, Comparisons, Lithology, Procedure, Nakhla, Minerals

Scientific paper

Carbon and oxygen isotopic analyses of carbonate-rich white-druse material isolated from a contact between lithologies A and C of the EETA 79001 shergottite indicate that this component is probably extraterrestrial in origin, and not simply an Antarctic weathering product. The delta(C-13) and delta(O-18) values of the CaCO3 (predominantly calcite) are unlike those of most common terrestrial carbonates (whether biogenic or abiogenic) but very similar to the corresponding values for carbonates analyzed from Nakhla (a meteorite closely allied to shergottites). It seems apparent that the carbonate minerals in these SNC meteorites were formed on the meteorites' parent body (Mars?). Isotopic analysis of nitrogen liberated during combustion of a carbonate-rich fraction of EETA 79001 does not give any clear evidence for the (N-15)-enriched component isolated from EETA 79001 lithology C glass and postulated as trapped Martian atmosphere. However, substantial amounts of nitrogen were present; the origin of these components is unclear, but the low temperature of release poses some constraints.

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