The illite-phosphate association

Details The illite-phosphate association The illite-phosphate association

Jan 1972

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1972gecoa..36....1w&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 36, Issue 1, pp.1-4

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Scientific paper

The insoluble (HCl) residues of phosphate grains from the Atlantic Coastal Plain, the Pacific Ocean and other areas, in addition to quartz, organic matter, and iron compounds, consist largely of K-feldspar and K-mica. Though the matrix of the phosphate sands contains a wide variety of clay minerals, only illite is present in the phosphate grains. Apparent K--Ar ages indicate most of the K-silicates are detrital in origin, though thin section studies show a minor amount of authigenic illite and glauconite are present in some phosphate grains. Chemical analyses and electron microscope studies indicate considerable amorphous material is present in the phosphate grains. The observed relations indicate that clay minerals may act as a phosphate reservoir during the formation of phosphorites and that the phosphate eventually destroys the non-K-clay minerals. The environment in which phosphate grains form is apparently similar to that in which glauconite forms.

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