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- W4289836064 abstract "Unlike the other terrestrial planets, Earth has a substantial silica-rich continental crust with a bulk andesitic composition. A small number of meteorites with andesitic bulk compositions have been identified that are thought to be the products of partial melting of chondritic protoliths, a mode of petrogenesis distinct from that of Earth’s continental crust. Here we show, using geochemical analyses, that unlike other known andesitic meteorites, Erg Chech 002 has strongly fractionated and low abundances of the highly siderophile elements and mineralogy consistent with origin from a melt. The meteorite’s bulk composition, which is similar to terrestrial andesites, cannot be explained by partial melting of basaltic lithologies and instead requires a metal-free chondritic source. We argue that Erg Chech 002 probably formed by ~15–25% melting of the mantle of an alkali-undepleted differentiated asteroid. Our findings suggest that extensive silicate differentiation after metal–silicate equilibration of chondritic parent bodies was already occurring within the first 2.25 million years of Solar System history and that andesitic crust formation does not necessarily require plate tectonics. Geochemical analyses of an andesitic meteorite suggest the continental-crust-like composition is due to partial melting after core formation on a differentiated parent body." @default.
- W4289836064 created "2022-08-05" @default.
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- W4289836064 date "2022-08-04" @default.
- W4289836064 modified "2023-09-24" @default.
- W4289836064 title "Early silicic magmatism on a differentiated asteroid" @default.
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- W4289836064 doi "https://doi.org/10.1038/s41561-022-00996-1" @default.
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