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Article Dans Une Revue Nature Communications Année : 2017

Reduced and unstratified crust in CV chondrite parent body

Clément Ganino

Résumé

Early Solar System planetesimal thermal models predict the heating of the chondritic protolith and the preservation of a chondritic crust on differentiated parent bodies. Petrological and geochemical analyses of chondrites have suggested that secondary alteration phases formed at low temperatures (<300 °C) by fluid-rock interaction where reduced and oxidized Vigarano type Carbonaceous (CV) chondrites witness different physicochemical conditions. From a thermodynamical survey of Ca-Fe-rich secondary phases in CV3 chondrites including silica activity (aSiO2), here we show that the classical distinction between reduced and oxidized chondrites is no longer valid and that their Ca-Fe-rich secondary phases formed in similar reduced conditions near the iron-magnetite redox buffer at low aSiO2 (log(aSiO2) <−1) and moderate temperature (210–610 °C). The various lithologies in CV3 chondrites are inferred to be fragments of an asteroid percolated heterogeneously via porous flow of hydrothermal fluid. Putative ‘onion shell’ structures are not anymore a requirement for the CV parent body crust.
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hal-01737089 , version 1 (03-01-2021)

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Paternité - Pas de modifications

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Clément Ganino, Guy Libourel. Reduced and unstratified crust in CV chondrite parent body. Nature Communications, 2017, 8 (1), ⟨10.1038/s41467-017-00293-1⟩. ⟨hal-01737089⟩
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