Petrology and chemistry of the new shergottite Dar al Gani 476

Details Petrology and chemistry of the new shergottite Dar al Gani 476 Petrology and chemistry of the new shergottite Dar al Gani 476

Jan 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000m%26ps...35...95z&link_type=abstract

Meteoritics & Planetary Science, vol. 35, no. 1, pp. 95-106 (2000).

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In 1998, Dar al Gani 476, was found in the Libyan desert. The meteorite is classified as a basaltic shergottite and is only the thirteenth Martian meteorite known to date. It has a porphyritic texture consisting of a fine-grained groundmass and larger olivines. The groundmass consists of pyroxene and feldspathic glass. Minor phases are oxides and sulfides as well as phosphates. The presence of olivine, orthopyroxene and chromite is a feature DaG 476 has in common with lithology A of EETA79001. However, in DaG 476 these phases appear to be early phenocrysts rather than xenocrysts. Shock features such as twinning, mosaicism and impact melt pockets are ubiquitous. Terrestrial weathering was severe and led to formation of carbonate veins following grain boundaries and cracks. With a molar MgO/(MgO+FeO) of 0.68, DaG 476 is the most magnesian member among the basaltic shergottites. Compositions of augite and pigeonite and some of the bulk element concentrations are intermediate between those of lherzolitic and basaltic shergottites. However, major elements such as Fe and Ti as well as LREE concentrations are considerably lower than in other shergottites. Noble gas concentrations are low and dominated by the mantle component previously found in Chassigny. A component, similar to that representing Martian atmosphere, is virtually absent. The ejection age of 1.35 +/- 0.10 Ma is older than that of EETA79001 and could possibly mark a distinct ejection.

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