Geologic map of the Church Rock Quadrangle, McKinley County, New Mexico

Green, Morris W.; Jackson, Timothy J.

doi:10.3133/ofr75258

Cited by 4 publications

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“…Green and Jackson, 1975a, 1975bHuffman, 1976;Kirk and Sullivan, 1976;Kirk and Zech, 1976a, 1976b, and 1978Robertson, 1974Robertson, , 1976Robertson, , 1978and Robertson and Jackson, 1975. Additional mapping by R. E. Thaden and V. P. Byers is still in progress.…”

Section: Hackman and Olson 1977mentioning

confidence: 99%

Review of the history of usage of the Gallup Sandstone and related units, southern and western San Juan Basin, New Mexico

Kirk¹,

Huffman²,

Zech³

et al. 1978

Open-File Report

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Section: Hackman and Olson 1977mentioning

confidence: 99%

Review of the history of usage of the Gallup Sandstone and related units, southern and western San Juan Basin, New Mexico

Kirk¹,

Huffman²,

Zech³

et al. 1978

Open-File Report

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“…Locations and brief descriptions of all of the mines in Dakota-age rocks referred to in the present report are given in (1969). Most of the mine locations are shown by the geologic quadrangle maps of the Church Rock (Green and Jackson, 1975), Gallup East (Green and Jackson, 1976), Thoreau NE (Green and Pierson, 1971), and Goat Mountain (Thaden and others, 1966) quadrangles.…”

mentioning

confidence: 99%

Factors that localized uranium deposition in the Dakota Sandstone, Gallup and Ambrosia Lake mining districts, McKinley County, New Mexico

Pierson¹,

Green²

1980

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Geologic studies were made at all of the uranium mines and prospects in the Dakota Sandstone of Early(?) and Late Cretaceous age in the Gallup mining district, McKinley County, N. Mex. Mines in rocks of Dakota age of the adjacent Ambrosia Lake mining district were visited for comparative purposes. Mines in the eastern part of the Gallup district and in the Ambrosia Lake district are on the Chaco slope of the southern San Juan Basin in strata that dip gently northward toward the central part of the basin. Mines in the western part of the Gallup district are along The Hogback (Nutria monocline) in strata that dip steeply westward into the Gallup sag. Geologic factors that controlled formation of the uranium deposits in the Dakota Sandstone are (1) the presence of a source of uranium, believed to be uranium deposits of the underlying Morrison Formation of Late Jurassic age; (2) the accessibility to the Dakota of uranium-bearing solutions from the Morrison; (3) the presence in the Dakota of permeable sandstone beds overlain by impermeable carbonaceous shale beds; and (4) the occurrence within the permeable Dakota Sandstone beds of carbonaceous reducing material as bedding-plane laminae or as pockets of carbonaceous trash. Most of the uranium deposits in the Dakota Sandstone are found in the lower part of the formation in marginal-marine distributary-channel sandstones. However, the Hogback No. 4 (Hyde) mine (Gallup district) is found in sandy paludal shale, and another deposit, the Silver Spur (Ambrosia Lake district), is found in what is interpreted to be a massive beach or barrier-island sandstone in the upper part of the Dakota. The most favorable sedimentary depositional environments for the accumulation of uranium are the areas lateral to main distributary channels, where levee, splay, and some distributary-channel sandstones intertongue with gray carbonaceous shales and siltstones of the well-drained swamp environment. Black carbonaceous shale beds formed in the poorly drained swamps in the interfluve areas are not favorable host rocks for uranium. The depositional energy levels of the various environments in which the sandstone and shale beds of the Dakota were deposited govern the relative favorability of the strata as uranium host rocks. In the report area, uranium commonly is in carbonaceous sandstone deposited in medium-energy channels. A prerequisite, however, is that the sandstone be overlain by impermeable shale beds. 1 2 URANIUM DEPOSITION IN THE DAKOTA SANDSTONE Medium-energy fluvial conditions result in the deposition of sandstone beds having detrital carbonaceous material distributed in laminae or in trash pockets on bedding planes. The carbonaceous laminae and trash pockets provide the necessary reductant to precipitate uranium from solution. High-energy fluvial conditions result in the deposition of sandstones having little or no carbonaceous material. Low-energy swampy conditions result in carbonaceous shale deposits, which are generally barren of uranium because of their relative impermeability ...

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“…Table 4 of Hilpert (1969) gives locations and brief descriptions of all of the Dakota mines referred to in the present report. Most of the mine locations are shown by the geologic quadrangle maps of the Church Rack (Green and Jackson, 1975), Gallup East (Green and Jackson, 1976), Ihoreau NE (Green and Pierson, 1971), and Goat Mountain (Thaden and others, 1966) quadrangles.…”

mentioning

confidence: 99%

Factors controlling localization of uranium deposits in the Dakota Sandstone, Gallup and Ambrosia Lake mining districts, McKinley County, New Mexico

Pierson¹,

Green²

1977

Open-File Report

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Ku POST-DAKOTA SEDIMENTARY ROCKS, UNDIFFERENTIATED (UPPER CRETACEOUS) Menefee Formation, Crevasse Canyon Formation, Gall up Sandstone, and Mancos Shale. Kd DAKOTA SANDSTONE (UPPER AND LOWER? CRETACEOUS) Includes the Whitewater Arroyo Tongue of the Mancos Shale and the Twowells Tongue of the Dakota Sandstone. Jm MORRISON FORMATION (UPPER JURASSIC) Includes Brushy Basin Shale, Westwater Canyon Sandstone, and Recapture Shale Members. Ju PRE-MORRISON SEDIMENTARY ROCKS, UNDIFFERENTIATED (MIDDLE JURASSIC) Cow Springs S.andstone, Summerville Formation, Todilto Limestone, and the Entrada Sandstone. TRc CHINLE FORMATION (UPPER TRIASSIC). CONTACT _MONOCLINAL FLEXURES showing upper and lower fold axes. _Arrows indicate direction of dip; longer arrow indicates flatter dip. STRIKE AND DIP OF BEDS. LIMIT OF BRUSHY BASIN SHALE MEMBER Brushy Basin Member of the Morrison Formation has been removed on the hachured side by pre-Dakota erosion. Queried where data unavailable. URANIUM MINE OR PROSPECT Mine symbol located in formation (Dakota Sandstone or Morrison Formation) in which ore occurs. (Ore in the Church Rock Mine is found in both the Dakota and the Morrison.

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Geologic map of the Church Rock Quadrangle, McKinley County, New Mexico

Cited by 4 publications

References 0 publications

Review of the history of usage of the Gallup Sandstone and related units, southern and western San Juan Basin, New Mexico

Review of the history of usage of the Gallup Sandstone and related units, southern and western San Juan Basin, New Mexico

Factors that localized uranium deposition in the Dakota Sandstone, Gallup and Ambrosia Lake mining districts, McKinley County, New Mexico

Factors controlling localization of uranium deposits in the Dakota Sandstone, Gallup and Ambrosia Lake mining districts, McKinley County, New Mexico

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