Item talk:Q72229

From geokb

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     "name": "Mineralogical characterization of weathered and less weathered strata of the Meade Peak phosphatic shale member of the Permian Phosphoria Formation: Measured sections E and F, Rasmussen Ridge, and measured sections G and H, Sage Creek area of the Webster Range, Caribou County, Idaho",
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     "abstract": "The Permian Phosphoria Formation of the western U.S. includes one of the largest\nphosphate deposits in the world. Despite the economic significance of this formation, its\nfine-grained nature has discouraged detailed mineralogical characterization and\nquantitative studies. Recently, selenium and other potentially hazardous trace elements\nin mine wastes have drawn increased attention to these rocks and motivated more\nextensive study. Part of this effort has focused on a more detailed geological and\nmineralogical characterization of the rocks. This study uses powder X-ray diffraction\n(XRD) with Rietveld quantification software to characterize the mineralogy of channel\nsamples from stratigraphic sections measured by the U.S. Geological Survey in the\nMeade Peak Phosphatic Shale Member of the Permian Phosphoria Formation. Measured\nsections are at the Rasmussen Ridge mine and at the Smoky Canyon mine approximately\n15 and 25 miles, respectively, northeast of Soda Springs, Idaho.\nThe dominant minerals present in these samples are carbonate-fluorapatite, which\nis the most common phosphatic ore mineral in this and other marine phosphorites, quartz,\nmuscovite, albite, orthoclase, the ammonium feldspar buddingtonite (NH4AlSi3O8),\ndolomite, and calcite. Because of their potential for hosting trace elements such as Se,\nthe presence of minor pyrite and sphalerite is also noteworthy. Analysis of the carbonate\ncontent in the carbonate-fluorapatite by Rietveld refinement shows relatively low\ncarbonate contents, generally between 2 ? 3% (wt.) CO3\n2- in the apatite structure,\ncompared to other marine phosphorites.",
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