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Dar al Gani
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DAR al gani 0476 -
Martian (shergottite) Al Jufrah, Libya - Found 1998 -
2.02kg |
A
brownish stone weighing 2015 g was found in Dar al Gani,
Sahara. Mineralogy and classification (J. Zipfel and P.
Scherer, MPI): fusion crust absent; meteorite has
a porphyritic texture, consisting of olivine embedded in
a fine-grained matrix of clinopyroxene laths (pigeonite
and minor augite) and interstitial feldspathic glass;
mineral abundances similar to EET 79001 lithology A;
Fe-sulfide, Ti-rich chromites, ilmenite and chromite
present; shock features include twinning and fracturing
of clinopyroxene, mosaicism of some olivine, and
plagioclase converted to feldspathic glass; impact-melt
pockets abundant; extensive terrestrial weathering
resulted in carbonate veins crosscutting the meteorite
along grain boundaries and cracks; bulk chemistry
intermediate between basaltic and lherzolitic
shergottites, with a high bulk Mg/(Mg + Fe), high
concentrations of siderophile elements, relatively low
abundances of heavy rare earth elements (HREE), and a
strong light rare earth element (LREE) depletion;
exposure age 1.1
±
0.2 Ma; 36Ar/132Xe
and 84Kr/132Xe typical of Martian
meteorites, and 129Xe/132Xe
similar to Chassigny. Oxygen isotopes (I. Franchi, OU):
d18O
= 4.57, d17O
= 2.69‰ rel. SMOW (D17O
= 0.317). The petrography, mineralogy, and noble gas
chemistry of DaG 476 and DaG 489 are very similar, and
the two are likely paired (L. Folco, MNA-SI, and
J. Zipfel and L. Schultz, MPI). Specimens: type
specimen, several grams, and one polished section,
MPI; main mass with anonymous finder.
Image Credit -
catchafallingstar.com
Description -
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