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The AAPG/Datapages Combined Publications Database
Journal of Sedimentary Research (SEPM)
Abstract
Marine Phosphorite Formation Off Peru
Frank Manheim, Gilbert T. Rowe, Dan Jipa
ABSTRACT
Formation of contemporary phosphorite in the Peru-Chile offshore area is confirmed. Synthesis is believed to occur as a result of replacement of carbonate tests of Holocene benthonic Foraminifera in the interstitial waters of organic-rich sediments. Step-by-step phosphatization of Holocene benthic Foraminifera can be demonstrated. Four simultaneous requirements for formation of phosphorites are: (a) sediments rich in organic detritus blanketed by (b) water with low concentrations of dissolved oxygen, (c) low rates of inorganic (especially terrigenous) sedimentation and (d) low but not negligible concentrations of calcium carbonate in the sediment.
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