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Gulbrandsen 1966

Gulbrandsen, R.A. (1966). Chemical composition of phosphorites of the Phosphoria Formation. Geochimica et Cosmochimica Acta 30(8): 769-778. doi: 10.1016/0016-7037(66)90131-1.

Results are presented of chemical analyses of 60 phosphorite samples from the Phosphoria Formation. The phosphate is basically apatite, with small but significant variable substitutions (Na, Sr, U, and Th for Ca; CO (sub 3) and SO (sub 4) for PO (sub 4) ). Rare metals not associated with apatite are associated mainly with the organic-matter component; Cr is most abundant. The average phosphorite consists of about 80 percent apatite, 10 percent quartz, 5 percent muscovite-illite, 2 percent organic matter, 1 percent dolomite-calcite, 1 percent iron oxide, and 1 percent other components. Texturally it is a medium-grained pellet phosphorite.

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	Abstract

	Table 1A
	Table 1B
	Table 1C
	Table 1D
	Table 1E
	Table 1F
	Table 2
	Table 3

	Chemical Analyses
	Major Constituents
	Rare Metals

Keywords
analyses; geochemistry; major-element analyses; mineral, composition; Paleozoic; Permian; Phosphate rock; Phosphoria, Formation; sedimentary rocks; trace-element analyses; United, States; western, 02, Geochemistry

Journal
Geochimica et Cosmochimica Acta
http://www.elsevier.com/wps/product/cws_home/212

Publisher
Elsevier Science
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The Netherlands
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