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Mineralogy and paragenesis of the McAllister Sn-Ta-bearing pegmatite, Coosa County, Alabama

January 1, 1989

The McAllister Sn-Ta deposit (Alabama) is localized in a complex pegmatite that contains large zones of mineralized late-stage replacement-type saccharoidal albite and nearly monomineralic muscovite 'greisen-like' pipes. The dyke is at least 450 m long and averages approximately 9 m in thickness. At least two 'greisen-like' pipes, as much as 7.6 m by 4.5 m in cross-section and extending at least 76 m down a steep easterly pitch, occur near the center of the dyke. The dyke is hosted by an approximately 300-Ma-old pluton of a group referred to as the Rockford Granite, a mesozonal to epizonal two-mica, peraluminous tin-bearing granite. The pluton is genetically affiliated with a well-defined sequence of simple to complex pegmatite dykes and quartz-casiterite veins that occur near its margin and within the immediately adjacent metasedimentary rocks of the Wedowee Group.

Citation Information

Publication Year 1989
Title Mineralogy and paragenesis of the McAllister Sn-Ta-bearing pegmatite, Coosa County, Alabama
DOI
Authors Eugene E. Foord, Robert B. Cook
Publication Type Article
Publication Subtype Journal Article
Series Title Canadian Mineralogist
Series Number
Index ID 70015654
Record Source USGS Publications Warehouse
USGS Organization