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.

First Page Preview

First page PDF preview
You do not currently have access to this article.