TangeiteMonument Valley, White Canyon-Monument Valley District, Apache & Navajo Cos., Arizona, USA
Photo: luigi chiappino ‡Ref.: Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 106, 116, 127, 141, 162, 165, 172, 184, 241, 285, 286, 295, 340, 431; Witkind, I.J. & R.E. Thaden (1963), Geology and uranium-vanadium deposits of the Monument Valley area, Apache and Navajo Cos., AZ: ; Mitcham, T.W. & C.G. Evensen (1955), Uranium ore guides, Monument Valley district, AZ, Econ.Geol.: 50: 170-176; Young, R.G. (1964), Distribution of uranium deposits in the White Canyon-Monument Valley district, UT-AZ, Econ.Geol.: 59: 850-973; Evensen, C.G. & I.B. Gray (1958), Evaluation of uranium ore guides, Monument Valley, AZ and UT, Econ. Geol.: 53: 639-662; Rosenzweig, A., et al (1954), Widespread occurrence and character of uraninite in the Triassic and Jurassic sediments of the Colorado Plateau, Econ.Geol.: 49: 351-361; Jensen, M.L. (1958), Sulphur isotopes and the origin of sandstone-type uranium deposits, Econ.Geol.: 53: 598-616; Holland, H.D., et al (1958), The use of leachable uranium in geochemical prospecting on the Colorado Plateau-II, The distribution of leachable uranium in surface samples in the vicinity of ore bodies, Econ.Geol.: 53: 190-209; Joralemon, I.B. (1952), Age can not wither her varieties of geological experience, Econ.Geol.: 47: 243-259; Coleman, R.G. & M. Delavaux (1957), Occurrence of selenium in sulphides from some elementary rocks of the western United States, Econ.Geol.: 5: 499-527.
Monument Valley lacks clearly delineated geographical boundaries. It occupies parts of SE Utah & NE Arizona and is near the eastern border of these states. It is within the central part of the Colorado Plateau.
Mineralization is in the Shinarump member of the Chinle formation and the Menkoepi formation. All uranium ore deposits are in symmetric & asymmetric troughs (channels)(62 channels), cut into the Moenkopi formation & the DeChelly Sandstone member of the Cutler formation and are filled with sedimentary rocks.
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