New eucrite Dar al Gani 872: Petrography, chemical composition, and evolution

Details New eucrite Dar al Gani 872: Petrography, chemical composition, and evolution New eucrite Dar al Gani 872: Petrography, chemical composition, and evolution

May 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003m%26ps...38..783p&link_type=abstract

Meteoritics & Planetary Science, vol. 38, no. 5, p.783-794

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Scientific paper

Dar al Gani 872 (DaG 872) is a new meteorite from Libya that we classified by means of Instrumental Neutron Activation Analysis (INAA), electron microprobe, and optical microscopy. According to our results, DaG 872 is a Mg-rich main group eucrite, i.e., a monomict noncumulate basaltic eucrite displaying a predominant coarse-grained relict subophitic and a fine-grained granulitic texture. The meteorite also shows pockets of late-stage mesostasis and is penetrated by several calcite veins due to terrestrial weathering. Finally, it exhibits shock phenomena of stage 1­2 including heavily fractured mineral components, undulose extinction of plagioclase, kinked lamellae, and mosaicism in pyroxenes corresponding to peak pressures of ~20 GPa. In view of petrographic criteria as well as compositional and exsolution characteristics of its pyroxenes, the sample represents a metamorphic type 5 eucrite. Assuming the metamorphic type to be a function of burial depth on the parent body and taking into account the relatively high shock stage, the excavation of DaG 872 was likely induced by a major impact event. Prior to this point, DaG 872 apparently underwent a 4-stage geological evolution that is reflected by intricate textural and mineralogical features.

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