Open-File Report 01-72

Preliminary Mineralogical Characterization of Weathered and Less-Weathered Strata of the Meade Peak Phosphatic Shale Member of the Permian Phosphoria Formation: Measured Sections C and D, Dry Valley, Caribou County, Idaho

by Andrew C. Knudsen*, Mickey E. Gunter*, and James R. Herring#

Prepared in Collaboration With

Bureau of Land Management

Forest Service

Agrium U.S. Inc.

Astaris LLC

J.R. Simplot Company

Monsanto

Rhodia Inc.

 

*University of Idaho, Department of Geological Sciences, Moscow ID 83844

# U.S. Geological Survey, DFC, Box25046, MS 973, Denver CO 80225

2001

This study used powder X-ray diffraction, with Rietveld quantification software to quantify and characterize the mineralogy of the 83 samples collected from two stratigraphic sections measured by the U.S. Geological Survey at the Dry Valley mine in the Meade Peak Member of the Phosphoria Formation. Analyses show extensive variability of carbonate substitution in the fluorapatite structure, determined by measuring the apatite a-cell dimension, as well as patterns of correlation between mineralogy and the stratigraphy.

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