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.File | Dimensione | Formato | |
---|---|---|---|
Coesite in impact rocks.pdf
accesso aperto
Tipologia:
Versione finale editoriale
Licenza:
Tutti i diritti riservati (All rights reserved)
Dimensione
227.82 kB
Formato
Adobe PDF
|
227.82 kB | Adobe PDF | Visualizza/Apri |
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.