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Glauconite and chamosite as depth indicators in the marine environment
Porrenga, D.H. (1967). Glauconite and chamosite as depth indicators in the marine environment. Mar. Geol. 5(5-6): 495-501
In: Marine Geology. Elsevier: Amsterdam. ISSN 0025-3227, more
Peer reviewed article  

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Keyword
    Marine

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  • Porrenga, D.H.

Abstract
    In tropical areas chamosite develops in the remains of organisms and in faecal pellets in the marine environment shallower than about 60 m, but occasionally down to about 150 m. Glauconite, not restricted to tropical areas, develops likewise, but at greater depths: in larger amounts generally between 30 and 2,000 m and in tropical areas in larger amounts deeper than about 125 m. So far, known occurrences of Recent chamosite are restricted to shallow marine environments in the tropics and this may indicate that warm (> 20°C) bottom water is essential for its formation. Temperatures lower than about 15°C tend to be favourable for the formation of glauconite.

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