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Open-File Report 01-72

Prepared in Collaboration With:

Bureau of Land Management, Forest Service, Agrium U.S. Inc., Astaris LLC, J.R. Simplot Company, Monsanto, Rhodia Inc.

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

Thumbnail of and link to report PDF (1.7 MB)Summary

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.

First posted June 11, 2001

For additional information, contact:
Geology, Minerals, Energy, and Geophysics Science Center
U.S. Geological Survey
345 Middlefield Road, MS 901
Menlo Park, CA 94025-3591
http://geomaps.wr.usgs.gov/gmeg/

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Suggested citation:

Knudsen, Andrew C., Gunter, Mickey E., Herring, James R., 2001, 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: U.S. Geological Survey Open-File Report 01-72, 69 pp., https://pubs.usgs.gov/of/2001/0072/.



Contents

Abstract

Introduction

Methods

Results

Comparison of A & B to C & D Benches

Discussion

References


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