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Fig. 4 | Geochemical Transactions

Fig. 4

From: A geochemical view into continental palaeotemperatures of the end-Permian using oxygen and hydrogen isotope composition of secondary silica in chert rubble breccia: Kaibab Formation, Grand Canyon (USA)

Fig. 4

(Diagram modified from [46])

Diagrammatic sketch contrasting chert-rich, marine carbonate rock and secondary silica and chert rubble deposits in a continental karst terrain. a Early diagenetic, marine carbonate-draped chert nodule with variable percentage of unreplaced carbonate. b Lag accumulation of resistant, slumped and randomly oriented chert nodules in a continental karst terrain. Unreplaced carbonate is leached out and replaced by secondary, cavity-fill silica which consists of fibrous, botryoidal and drusy quartz

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