Iron Hill carbonatite complex

outcrops of asbestos in Gunnison county, CO

Geologic information

Name of siteIron Hill carbonatite complex
Developmentoutcrops
StateCO
CountyGunnison
Geographic location:-107.0504, 38.2489
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Fibrous mineralFibrous blue magnesio-arfvedsonite and richterite are found in the groundmass, often occurring as large mats"" (Lowers, 2005, p. 23)
Associated mineralscalcite
dolomite
apatite
biotite
iron-titanium oxides
barite
pyroxene
pyrite
Host rock typesmixed zone along carbonatite-pyroxenite contact
Geologic map unit-107.0504, 38.2489
Nearby scientific dataFind additional scientific data near this location

Reference information

Olson, J.C., and Wallace, S.R., 1956, Thorium and rare-earth minerals in the Powderhorn district, Gunnison County, Colorado: U.S. Geological Survey Bulletin 1027-O, 28 p., 2 plates.
[http://pubs.er.usgs.gov/publication/b1027O]
Temple, A.K., and Grogan, R.M., 1965, Carbonatite and related alkalic rocks at Powderhorn, Colorado: Economic Geology, v. 60, no. 4, p. 672-692.
[http://econgeol.geoscienceworld.org/cgi/reprint/60/4/672]
Nash, W.P., 1972, Mineralogy and petrology of the Iron Hill carbonatite complex, Colorado: Geological Society of America Bulletin, v. 83, no. 5, p. 1361-1382.
[http://gsabulletin.gsapubs.org/content/83/5/1361.full.pdf+html]
Olson, J.C., 1974, Geologic map of the Rudolph Hill quadrangle, Gunnison, Hinsdale, and Saguache Counties, Colorado: U.S. Geological Survey Geologic Quadrangle Map GQ-1177, scale 1:24,000.
[http://pubs.er.usgs.gov/publication/gq1177]
Hedlund, D.C., and Olson, J.C., 1975, Geologic map of the Powderhorn quadrangle, Gunnison and Saguache Counties, Colorado: U.S. Geological Survey Geologic Quadrangle Map GQ-1178, scale 1:24,000.
[http://pubs.er.usgs.gov/publication/gq1178]
Armbrustmacher, T.J., 1980, Abundance and distribution of thorium in the carbonatite stock at Iron Hill, Powderhorn district, Gunnison County, Colorado: U.S. Geological Survey Professional Paper 1049-B, 11 p.
[http://pubs.er.usgs.gov/publication/pp1049B]
Olson, J.C., and Hedlund, D.C., 1981, Alkalic rocks and resources of thorium and associated elements in the Powderhorn district, Gunnison County, Colorado: U.S. Geological Survey Professional Paper 1049-C, 34 p.
[http://pubs.er.usgs.gov/publication/pp1049C]
White-Pinilla, K.C., 1996, Characterization of fenitizing fluids and processes involved in fenitization at the Iron Hill carbonatite complex, Gunnison County, Colorado: Golden, Colo., Colorado School of Mines, M.S. thesis, 170 p.
Cappa, J.A., 1998, Iron Hill alkalic complex, Powderhorn district (Chapter 7), in Cappa, J.A., Alkalic igneous rocks of Colorado and their associated ore deposits: Colorado Geological Survey Resource Series 35, p. 61-68.
Shaver, K.C., and Lunceford, R.A., 1998, White Earth Project, Colorado--The largest titanium resource in the United States: Canadian Industrial Minerals Bulletin, v. 91, p. 63-65.
Lowers, H.A., 2005, Origin of fibrous amphiboles in the Iron Hill carbonatite complex, Gunnison County, Colorado: Golden, Colo., Colorado School of Mines, M.S. thesis, 159 p.
Van Gosen, B.S., Lowers, H.A., Bush, A.L., Meeker, G.P., Plumlee, G.S., Brownfield, I.K., and Sutley, S.J., 2005, Reconnaissance study of the geology of U.S. vermiculite deposits--Are asbestos minerals common constituents?: U.S. Geological Survey Bulletin 2192, 8 p.
[http://pubs.er.usgs.gov/publication/b2192]