The formation of weathering products on the LEW 85320 ordinary chondrite - Evidence from carbon and oxygen stable isotope compositions and implications for carbonates in SNC meteorites

Details The formation of weathering products on the LEW 85320 ordinary chondrite - Evidence from carbon and oxygen stable isotope compositions and implications for carbonates in SNC meteorites The formation of weathering products on the LEW 85320 ordinary chondrite - Evidence from carbon and oxygen stable isotope compositions and implications for carbonates in SNC meteorites

Mar 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989metic..24....1g&link_type=abstract

Meteoritics (ISSN 0026-1114), vol. 24, March 1989, p. 1-7. Research supported by SERC.

Computer Science

9

Carbonates, Chondrites, Isotopic Enrichment, Meteoritic Composition, Weathering, Antarctic Regions, Carbon, Oxygen, Petrography, Meteorites, Weathering, Lew 85320, Ordinary Chondrites, Lew Meteorites, Carbon, Oxygen, Isotopes, Composition, Carbonates, Snc Meteorites, Water, Samples, Meteorite, Laboratory Studies, Eeta 79001, Nakhla, Eet Meteorites, Nesquehonite, Formation, Origin, Silicates, Antarctic Meteorites

Scientific paper

Isotopic analysis of nesquehonite recovered from the surface of the LEW 85320 H5 ordinary chondrite shows that the delta C-13 and delta O-18 values of the two generations of bicarbonate (Antarctic and Texas) are different: delta C-13 = + 7.9 per mil and + 4.2 per mil; delta O-18 = + 17.9 per mil and + 12.1 per mil, respectively. Carbon isotopic compositions are consistent with equilibrium formation from atmospheric carbon dioxide at - 2 + or - 4 C (Antarctic) and + 16 + or - 4 C (Texas). Oxygen isotopic data imply that the water required for nesquehonite precipitation was derived from atmospheric water vapor or glacial meltwater which had locally exchanged with silicates, either in the meteorite or in underlying bedrock. Although carbonates with similar delta C-13 values have been identified in the SNC meteorites EETA 79001 and Nakhla, petrographic and temperature constraints argue against their simply being terrestrial weathering products.

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