Coesite, a high-pressure silica polymorph, is a diagnostic indicator of impact cratering in quartz-bearing target rocks. The mechanism formation of coesite is still debate since its discovery in 1960s therefore it remains the subject of numerous studies aiming to better understand how silica polymorphs react under sudden and extreme P-T increases. Here, I show evidence documenting the coesite formation through direct quartz-tocoesite transformation in subsolidus conditions studying two different impact events: Kamil crater (Egypt), a small-scale simple crater of 45 m in diameter, and the large-scale Australasian tektite/microtektite strewn field.

The formation of coesite in impact rocks

Campanale F.
;
Mugnaioli E.;Folco L.;Gemmi M.
2022-01-01

Abstract

Coesite, a high-pressure silica polymorph, is a diagnostic indicator of impact cratering in quartz-bearing target rocks. The mechanism formation of coesite is still debate since its discovery in 1960s therefore it remains the subject of numerous studies aiming to better understand how silica polymorphs react under sudden and extreme P-T increases. Here, I show evidence documenting the coesite formation through direct quartz-tocoesite transformation in subsolidus conditions studying two different impact events: Kamil crater (Egypt), a small-scale simple crater of 45 m in diameter, and the large-scale Australasian tektite/microtektite strewn field.
2022
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/1153954
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