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Elsevier, Geochimica et Cosmochimica Acta, (161), p. 101-117

DOI: 10.1016/j.gca.2015.04.010

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Comprehensive study of carbon and oxygen isotopic compositions, trace element abundances, and cathodoluminescence intensities of calcite in the Murchison CM chondrite

Journal article published in 2015 by Wataru Fujiya, Naoji Sugiura, Yves Marrocchi, Naoto Takahata, Peter Hoppe, Kotaro Shirai, Yuji Sano ORCID, Hajime Hiyagon
This paper was not found in any repository, but could be made available legally by the author.
This paper was not found in any repository, but could be made available legally by the author.

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Abstract

We have performed in situ analyses of C and O isotopic compositions, trace element concentrations, and cathodoluminescence (CL) intensities on calcite in Murchison, a weakly altered CM chondrite. We found that the trace element (Mg, Mn, and Fe) concentrations are heterogeneous within single calcite grains. Grain to grain heterogeneity is even more pronounced. The analyzed calcite grains can be separated into two distinct types with respect to their C isotopic ratios, trace element concentrations, and CL characteristics: Calcite grains with higher δ13CPDB values (∼75 ‰) have low trace element concentrations and uniformly dark CL, while grains with lower δ13C values (∼35 ‰) have higher trace element concentrations and CL zoning. In contrast to the C isotopic ratios, O isotopic ratios are similar for both types of calcites (δ18OSMOW ∼ 34 ‰).