Calcium carbonate and sulfate of possible extraterrestrial origin in the EETA 79001 meteorite

Details Calcium carbonate and sulfate of possible extraterrestrial origin in the EETA 79001 meteorite Calcium carbonate and sulfate of possible extraterrestrial origin in the EETA 79001 meteorite

Apr 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988gecoa..52..909g&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 52, April 1988, p. 909-915. NASA-supported research.

Computer Science

47

Calcium Carbonates, Mars (Planet), Meteoritic Composition, Pyroxenes, Electron Microscopy, Mass Spectroscopy, X Ray Diffraction, Meteorites, Calcium Carbonate, Sulfates, Origin, Source, Eeta 79001, Eet Meteorites, Antarctic Meteorites, Samples, Meteorite, Inclusions, Laboratory Studies, Shergottites, Stony Meteorites, Composition, Sem, Description, Parent Bodies, Procedure, Minerals, Photomicrographs, Electron Microscopy, Weathering, Geochemistry, Shock Effects, Melting

Scientific paper

Two varieties of Ca-carbonate were found in a total of three interior (greater than 2-cm depth) samples of glass inclusions from the shergottite meteorite, Elephant Moraine, Antarctica, A79001. Two of the samples, including the largest deposit around a vug near the center of the meteorite (8-cm depth), contained veins of granular calcite with significant Mg and P, either as Mg-calcite with dissolved P or as calcite with very finely intergrown Mg-bearing phosphate. The second variety, which occurred in a third sample with a previously documented high concentration of trapped gases, consisted of disseminated 10-20-micron anhedral grains of nearly pure CaCO3 and was intimately associated with laths and needles of Ca-sulfate (possibly gypsum). All evidence considered, it is probable that both varieties of Ca-carbonate (and the Ca-sulfate) formed on a planetary body (probably Mars) before the meteorite fell on earth.

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