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Petrography and Mineralogy of Calcium-, Aluminum-Rich Inclusions in an Unequilibrated Carbonaceous Chondrite Y 81020 (CO3.05)


Affiliations
1 Center for Isotope Cosmochemistry and Geochronology, Astromaterials Research and Exploration Science Division, EISD-XI, NASA-Johnson Space Center, 2101, NASA Parkway, Houston, TX 77058, United States
 

Petrographic and quantitative analyses of more than 70 refractory inclusions found in the studied thin section of Yamato 81020 (CO3.05) showed diverse objects that can be grouped into five distinct types based on morphology and mineralogy. Mineralogical, textural similarities to the pristine carbonaceous vigarano (3.1–3.4) types of Efremovka, Vigarano were observed despite their smaller size (~100 micron diameter). Wark-Lovering rims were found predominantly in melilite-rich calcium, aluminum-rich inclusions. Comparison of mineralogy, morphology at macro and micro scale of Y 81020 with ALH A77307 and other carbonaceous chondrites is suggestive of the unaltered characteristics of the refractory inclusions in agreement with previous studies.

Keywords

Antarctic Meteorites, Calcium, Aluminumrich Inclusions, Petrography, Quantitative Analyses, Unequilibrated Carbonaceous Chondrites.
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  • Petrography and Mineralogy of Calcium-, Aluminum-Rich Inclusions in an Unequilibrated Carbonaceous Chondrite Y 81020 (CO3.05)

Abstract Views: 370  |  PDF Views: 150

Authors

Ritesh Kumar Mishra
Center for Isotope Cosmochemistry and Geochronology, Astromaterials Research and Exploration Science Division, EISD-XI, NASA-Johnson Space Center, 2101, NASA Parkway, Houston, TX 77058, United States

Abstract


Petrographic and quantitative analyses of more than 70 refractory inclusions found in the studied thin section of Yamato 81020 (CO3.05) showed diverse objects that can be grouped into five distinct types based on morphology and mineralogy. Mineralogical, textural similarities to the pristine carbonaceous vigarano (3.1–3.4) types of Efremovka, Vigarano were observed despite their smaller size (~100 micron diameter). Wark-Lovering rims were found predominantly in melilite-rich calcium, aluminum-rich inclusions. Comparison of mineralogy, morphology at macro and micro scale of Y 81020 with ALH A77307 and other carbonaceous chondrites is suggestive of the unaltered characteristics of the refractory inclusions in agreement with previous studies.

Keywords


Antarctic Meteorites, Calcium, Aluminumrich Inclusions, Petrography, Quantitative Analyses, Unequilibrated Carbonaceous Chondrites.

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DOI: https://doi.org/10.18520/cs%2Fv114%2Fi07%2F1510-1519