USGS Open-file Report 02-125

Open-File Report 02-125

MINERALOGICAL CHARACTERIZATION OF STRATA OF THE MEADE PEAK PHOSPHATIC SHALE MEMBER OF THE PERMIAN PHOSPHORIA FORMATION

Channel and Individual Rock Samples of Measured Section J and Their Relationship to Measured Sections A and B, Central Part of Rasmussen Ridge, Caribou County, Idaho

by

A. C. Knudsen1, M. E. Gunter1, J. R. Herring2, and R. I. Grauch2

1 Department of Geological Sciences, University of Idaho, Moscow, ID 83844-3022
2 U.S. Geological Survey, Denver Federal Center, Box 25046, MS 973, Denver, CO 80225

2002

The Permian Phosphoria Formation of southeastern Idaho hosts one of the largest phosphate deposits in the world. Despite the economic significance of this Formation, the fine-grained nature of the phosphorite has discouraged detailed mineralogical characterization and quantification studies. Recently, selenium and other potentially toxic trace elements in mine wastes have drawn increased attention to this formation, and motivated additional study. This study uses powder X-ray diffraction (XRD), with Rietveld quantification software, to quantify and characterize the mineralogy of composite channel samples and individual samples collected from the stratigraphic sections measured by the U.S. Geological Survey in the Meade Peak Member of the Permian Phosphoria Formation at the Enoch Valley mine on Rasmussen Ridge, approximately 15 miles northeast of Soda Springs, Idaho.

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Created: 6-11-01
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