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- W2080450095 abstract "The EETA 79001 achondrite consists of two distinct igneous lithologies joined along a planar, non-brecciated contact. Both are basaltic rocks composed primarily of pigeonite, augite, and maskelynite, but one contains zoned megacrysts of olivine, orthopyroxene, and chromite that represent disaggregated xenoliths of harzburzite. Both lithologies probably formed from successive volcanic flows or multiple injections of magma into a small, shallow chamber. Many similarities between the two virtually synchronous magmas suggest that they are related. Possible mechanisms to explain their differences involve varying degrees of assimilation, fractionation from similar parental magmas, or partial melting of a similar source peridotite; of these, assimilation of the observed megacryst assemblage seems most plausible. However, some isotopic contamination may be required in any of these petrogenetic models. The meteorite has suffered extensive shock metamorphism and localized melting during a large impact event that probably excavated and liberated it from its parent body. Both basaltic lithologies and the inferred ultramafic protolith of the megacryst assemblage are petrologically similar to other members of the shergottite group, and all may have been derived from a volcanic-plutonic complex on a planetary body." @default.
- W2080450095 created "2016-06-24" @default.
- W2080450095 creator A5044393706 @default.
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- W2080450095 date "1983-08-01" @default.
- W2080450095 modified "2023-10-12" @default.
- W2080450095 title "Petrogenesis of the Elephant Moraine A79001 meteorite: Multiple magma pulses on the shergottite parent body" @default.
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- W2080450095 doi "https://doi.org/10.1016/0016-7037(83)90309-5" @default.
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