Petrographic and isotopic (δ 18O, δ 17O, δ 13C, and δ 14C) study of carbonate minerals in a group of paired Antarctic CM2 meteorites.

Details Petrographic and isotopic (δ 18O, δ 17O, δ 13C, and δ 14C) study of carbonate minerals in a group of paired Antarctic CM2 meteorites. Petrographic and isotopic (δ 18O, δ 17O, δ 13C, and δ 14C) study of carbonate minerals in a group of paired Antarctic CM2 meteorites.

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufm.p33a1004t&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #P33A-1004

Other

6008 Composition, 6205 Asteroids And Meteoroids, 6240 Meteorites And Tektites, 1040 Isotopic Composition/Chemistry, 1060 Planetary Geochemistry (5405, 5410, 5704, 5709, 6005, 6008)

Scientific paper

Oxygen isotope data for meteoritic carbonates from CM chondrite falls have been used to gain insight into preterrestrial alteration processes and the oxygen isotopic evolution of the aqueous phase in the parent body planetesimals (e.g., Benedix et al., GCA 2003). The possibility of expanding this approach to the larger population of Antarctic meteorites represents a potentially valuable source of further information. In this study, oxygen and carbon isotopic compositions were used to evaluate terrestrial and preterrestrial carbonate formation in paired Antarctic CM2 meteorites (EET96006, EET96016, EET96017, and EET96019). The presence of microcrystalline carbonate veins consisting of intergrown magnesite and dolomite with minor calcite and well-formed, 10-50 micron diameter calcite grains in the meteorite matrix, sometimes rimmed by tocchilinite, suggests the presence of at least two generations of carbonates. δ 18O and δ 17O data for carbonate extracted by stepped acid extractions form an array that is bound at one end by the array of published carbonate oxygen isotope data of un-weathered CM2 falls (e.g., Benedix et al., GCA 2003) and trends toward an intersection with the terrestrial mass fractionation at δ 18O and δ 17O of \sim0. Carbonate δ 13C and fraction of modern carbonate (FMOD14C), when considered in the context of δ 18O and δ 17O, suggest the presence of at least two added terrestrial carbonate components derived during the weathering cycle: carbonate derived from atmospheric post-bomb sources and carbonate precipitated with another carbon source.

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