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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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  • Amelin, Y., Krot, A. N., Hutcheon, I. D. and Ulyanov, A. A., Lead isotopic ages of chondrules and calcium-aluminum-rich inclusions. Science, 2002, 297, 1678–1683.

  • Bouvier, A. and Wadhwa, M., The age of the solar system redefined by the oldest Pb–Pb age of a meteoritic inclusion. Nat. Geosci., 2010, 3, 637–641.

  • Christophe Michel-Levy, M., Un chondre exceptionnel dans la meteorite de vigarano. Bull. Soc. France Mineral. Crystallog., 1968, 91, 212–214.

  • Grossman, L., Refractory inclusions in the Allende meteorite. Annu. Rev. Earth Planet. Sci., 1980, 8, 559–608.

  • MacPherson, G. J., Calcium–aluminum-rich inclusions in chondritic meteorites, In Meteorites, Comets, and Planets, Treatise on Geochemistry (ed. Davis, A. M.), Elsevier, 2007, vol. 1, pp. 201–246.

  • MacPherson, G. J., Simon, S. B., Davis, A. M., Grossman, L. and Krot, A. N., Calcium-aluminum-rich inclusions: Major unanswered questions. In Chondrites and ProtoPlanetary Disk (eds Krot, A. N., Scott, E. R. D. and Reipurth, B.), San Francisco, 2005, pp. 225–250.

  • Krot, A. N., Keil, K., Scott, E. R. D., Goodrich, C. A., Weisberg, M. K. and MacPherson, G. J., Classification of meteorites and their genetic relationships. In Meteorites, Comets, and Planets, Treatise on Geochemistry (ed. Davis, A. M.), Holland, H. D. and Turekian, K. K. (Executive editors), Elsevier, 2007, vol. 1, pp. 1–64.

  • Connolly, H. C. and Burnett, D. S., A study of the minor element concentrations of spinels from two type B calcium-aluminum-rich inclusions: An investigations into potential formation conditions of calcium-aluminum rich inclusions. Meteorit. Planet. Sci., 1999, 34, 829–848.

  • Connolly, H. C., Burnett, D. S. and McKeegan, K. D., The petrogenesis of type B1 Ca-Al-rich inclusions: The spinel perspective. Meteorit. Planet. Sci., 2003, 38, 197–224.

  • Simon, S. B., Davis, A. M., Grossman, L. and Zinner, E. K., Origin of hibonite-pyroxene spherules found in carbonaceous chondrites. Meteorit. Planet. Sci., 1998, 33, 411–424.

  • Russell, S. S., Huss, G. R., Fahey, A. J., Greenwood, R. C., Hutchison, R. and Wasserburg, G. J., An isotopic and petrologic study of calcium-aluminum-rich inclusions from CO3 meteorites. Geochim. Cosmochim. Acta, 1998, 62, 689–714.

  • Russell, S. S., Davis, A. M., MacPherson, G. J., Guan, Y. and Huss G. R., Refractory inclusions from the ungrouped carbonaceous chondrites MAC 87300 and MAC 88107. Meteorit. Planet. Sci., 2000, 35, 1051–1066.

  • Kojima, T., Yada, S. and Tomeoka, K., Ca-Al-rich inclusions in three antarctic CO3 chondrites, Yamato-81020, Yamato-82050 and Yamato-790992: Record of low-temparature alteration. Proc. NIPR Symp. Antarct. Meteorites, 1995, 8, 79–96.

  • Kimura, M., Grossman, J. N. and Weisberg, M. K., Fe-Ni metal in primitive chondrites: Indicators of classification and metamorphic conditions for ordinary and CO chondrites. Meteorit. Planet. Sci., 2008, 43, 1161–1177.

  • Grossman, J. N. and Brearley, A. J., The onset of metamorphism in ordinary and carbonaceous chondrites. Meteorit. Planet. Sci., 2005, 40, 87–122.

  • Bonal, L., Quirico, E., Bourot-Denise, M. and Montagnac, G., Determination of the petrologic type of CV3 chondrites by Raman spectroscopy of included organic matter. Geochim. Cosmochim. Acta, 2006, 70, 1849–1863.

  • Bonal, L., Bourot-Denise, M., Quirico, E., Montagnac, G. and Lewin, E., Organic matter and metamorphic history of CO chondrites. Geochim. Cosmochim. Acta, 2007, 71, 1605–1623.

  • Itoh, S., Kojima, H. and Yurimoto, H., Petrography and oxygen chemistry of Ca-, Al-rich inclusions in CO chondrites. LPSC 31, 2000, A#1323.

  • Mishra, R. K. and Chaussidon, M., Timing and extent of Mg and Al isotopic homogenization in the early inner Solar System. Earth Planet. Sci. Lett., 2014, 390, 318–326.

  • Krot, A. N., MacPherson, G. J., Ulyanov, A. A. and Pataev, M. I., Fine grained, spinel-rich inclusions from reduced CV chondrites Efremovka and Leoville: I. Mineralogy, petrology, and bulk chemistry. Meteorit. Planet. Sci., 2004, 39, 1517–1553.

  • Wark, D. A. and Lovering, J. F., Marker events in the early solar system: evidence from rims on Ca-Al-rich inclusions in the carbonaceous chondrites. Proc. 8th Lunar Sci. Conf., 1977, pp. 95–112.

  • Wark, D. A. and Boynton, W. V., The formation of rims on calcium aluminum-rich niclusions: Step I. Flash heating. Meteorit. Planet. Sci., 2001, 36, 1135–1166.


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

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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