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- W183533794 abstract "Minerals districts an southwestern Colorado commonly contain a central altered area encliosed by irregular zones containing different metal deposits, including uranium. The central altered area is essentially a high-angle pipe'' which encloses a portion of a major fault zone, or an igneous contact, or is apparently not associated with any major structure. Alteration occurs in all rock types although it is selectively stronger in the metamorphic basement rocks and the intrusives of Tertiary age. Alteration, in paragenetic sequence, is commonly of the argillitic, sericitic, silicic, and pyritic types. In intensely mineralized districts, veins and replacement bodies occur principally marginal to the central, pervasively altered area, in ground altered only in the wall zones of larger fissures. Deposits within the central altered area are principally replacement disseminations. Types of metal deposits are generally grouped along preferred structural weaknesses according to distance from the central alltered area. Each group defines a zone, partially concentric about a central area. The central allteration pipe is interpreted as the principal feeder channel for the district and represents the most permeable locality prior to mineralization. Early alteration products are believed to have sealed this permeable area near the surface, forcing later metalilizing solutions from the centralmore » channel at depth to less permeable available marginal channels. Later solutions rose through successively more distant channels, unless inner channels were reopened or incompletely sealed. In the western Colorado metallogenic province uranium occurs within some central alteration pipes, possibly as a lattice constituent in iron sulfide. Deposits contain less than 100 tons of rock containing 0.03% U/sub 3/O/sub 8/. Uranium occurs in base-metal zones as pitchblende, commonly associated with copper. Here deposits are less than 1000 tons of 0.1% U/sub 3/O/ sub 8/ material. Commercial uranium deposits occur on the outer margin of the gold zone, where deposits may be about 50,000 tons of 0.5% U/sub 3/O/sub 8/ ore. Many alteration pipes in the southern Colorado Plateau enclose collapsedbreccia or collapsed-plug pipe structures which contain no volcanic material, but which are interpreted as cryptovolcanic structures. Many of these pipes are mineralized by uranium. Several, having a magnitude order of 30,000 tons of 0.5% U/sub 3/O/sub 8/ ore per pipe, are known. These pipes are interpreted as possible central feeder structures for districts where the ore is of hydrothermal origin. Such pipes may not only contain uranium deposits but may also have supplied laterally migrating solutions from which outlying sandstone impregnations were deposited. (auth)« less" @default.
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- W183533794 date "1958-06-01" @default.
- W183533794 modified "2023-09-28" @default.
- W183533794 title "Relation of uranium deposits to feeder structures, associated alteration, and mineral zones" @default.
- W183533794 doi "https://doi.org/10.2172/4327417" @default.
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