Physics
Scientific paper
Nov 1967
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1967gecoa..31.2109c&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 31, Issue 11, pp.2109-2123
Physics
5
Scientific paper
The development of siderite and pyrite in certain argillaceous sediments of West- phalian age has been studied in detail. Pyrite proved to predominate in marine samples whereas siderite-rich samples were associated with a non-marine fauna. Both phases formed after deposition, at some distance below the sediment/water interface. Both grew partially at the expense of iron within the detrital silicate fraction of the sediment and partially from ferric hydroxides. The latter were either transported and deposited with the clay minerals or were precipitated from the depositional waters. The extent of diagenetic mineral development was primarily governed by the activities of anionic species bacterially generated within the diagenetic environment. The aqueous phase was at all times strongly reducing and no evidence was found to suggest that the redox potential of the siderite-growth environment was higher than that of the pyrite environment.
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