Other
Scientific paper
Jun 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986gecoa..50..983w&link_type=abstract
(Lunar and Planetary Institute, NASA, American Geophysical Union, et al., Lunar and Planetary Science Conference, 16th, Houston,
Other
12
Abundance, Achondrites, Carbon, Isotopic Enrichment, Meteoritic Composition, Chemical Composition, Evolution (Development), High Temperature, Magma, Mars Atmosphere, Shock Loads, Meteorites, Stony Meteorites, Achondrites, Shergotty, Samples, Meteorite, Carbon, Abundance, Isotopes, Shergottites, Laboratory Studies, Chemistry, Thermal Properties, Nakhla, Shock Effects, Formation, Origin, Nitrogen, Temperature, Procedure, Antarctic Meteorites, Alh Meteorites, Alha77005, Eet Meteorites, Eeta79001, Zagami, Conce
Scientific paper
Consortium samples of the Shergotty meteorite have been measured for C abundance and isotopic composition by stepped combustion and the results compared to different samples of the same meteorite and the other known shergottites. Clearly, the shergottite meteorites have a complex C chemistry and contain components of both low and high thermal stability. Two components labile at low temperature can be tentatively identified. One is enriched in C-13 and may be related to the carbonate thought to be produced by preterrestrial weathering in Nakhla. The other, which is isotopically light, is of unknown origin but might be related to shock effects. At high temperatures, two of the samples examined show evidence for a component of CO2 trapped from the Martian atmosphere, possibly indicating that shock-produced glass is heterogeneously distributed throughout the shergottite group. This interpretation is corroborated by N-isotope measurements made on one of the specimens. All samples appear to contain evidence of a high temperature magmatic component of C.
Carr Robert H.
Pillinger Colin T.
Wright Ian P.
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