Origin of Silver-Copper-Lead Deposits in Red-Bed Sequences of Trans-Pecos Texas: Tertiary Mineralization in Precambrian, Permian, and Cretaceous Sandstones

Price, Jonathan G.; Henry, Christopher D.; Standen, Allan R.; Posey, J.S.

doi:10.23867/ri0145d

Cited by 3 publications

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“…The resulting normal faults were oriented north and northwest, but in part, these directions were the result of Laramide trends. Contemporaneous eastnortheast-and northeast-trending fractures document the change to northwest-oriented extension (Price, 1983). The timing of this change in stress orientation has not been established, but a similar change occurred in the northern Rio Grande rift and in the rest of the Basin and Range province about 10 m.y.…”

Section: Basin and Range Extensionmentioning

confidence: 96%

Studies of geology and hydrology in the Basin and Range Province, southwestern United States, for isolation of high-level radioactive waste: Characterization of the Trans-Pecos region, Texas

Bedinger¹,

Sargent²,

Langer³

1989

Professional Paper

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The Trans-Pecos region of Texas, in the southeasternmost part of the Basin and Range province, is semiarid; precipitation ranges from less than 250 to 450 millimeters and potential evapotranspiration is as great as 2.5 meters annually. Structurally, the region is transitional with the Great Plains to the east; only the northern and western parts of the region have well-developed, northwest-trending basins and ranges. The area has experienced repeated deformation since the Precambrian with igneous activity and basin-and-range extension, and to a lesser extent Laramide structures, dominating the topography. Potential host media for isolation of high-level radioactive waste in the region include: (1) Intrusive rocks occurring as stocks, sills, and laccoliths of several rock types; (2) tuffaceous rocks, which include densely welded ash-flow tuff; (3) basaltic lava flows; and (4) argillaceous Manuscript approved for publication, January 3, 1985. rocks. Quaternary tectonism of the region is characterized by: (1) Many small earthquakes and only one damaging earthquake; (2) heat flow that is transitional between that of the craton to the east and the greater heat flow of the Basin and Range; and (3) Quaternary fault scarps, which are more common in the western part of the region. Longterm (late Cenozoic to modern) vertical crustal movement is estimated to be 1 to 2 meters per 10,000 years. Surface and groundwater drainage in the region is to the Rio Grande and to topographically closed basins. Groundwater recharge in the upland areas and in channels of ephemeral streams probably averages about 10 millimeters or less annually. Relatively long travel paths and traveltimes exist from groundwater divides to natural discharge areas. Ground water generally contains less than 1,000 milligrams per liter of dissolved solids except in the Salt Basin where concentrations exceed 3,000 milligrams per liter. Mineral production from the Trans-Pecos region has been dominated by silver, fluorspar, and mercury. Bl B2

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Section: Basin and Range Extensionmentioning

confidence: 96%

Studies of geology and hydrology in the Basin and Range Province, southwestern United States, for isolation of high-level radioactive waste: Characterization of the Trans-Pecos region, Texas

Bedinger¹,

Sargent²,

Langer³

1989

Professional Paper

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Mid‐Cenozoic stress evolution and magmatism in the Southern Cordillera, Texas and Mexico: Transition from continental arc to intraplate extension

Henry¹,

Price²,

James³

1991

J. Geophys. Res.

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Orientations of dikes, veins, faults, and slickenlines reveal the evolution of stress during Eocene to Miocene magmatism in the southern Cordillera. Where most thoroughly studied by us in Trans‐Pecos Texas, magmatism began at about 48 Ma shortly after the cessation of Laramide folding. Dikes and veins that formed from then until about 32 Ma strike dominantly east‐northeast. This indicates that the least principal stress (σ3) was north‐northwest; additional data suggest that the maximum principal stress (σ1) was east‐northeast. The stress field changed to σ1 vertical and σ3 east‐northeast (i.e., east‐northeast extension) at least by 28 Ma and probably by 31 Ma. Dikes and veins that formed between 31 and 17 Ma, when all magmatism ceased in Texas, strike north‐northwest. This change marks the beginning of regional, Basin and Range extension; however, major normal faulting, exclusively of high‐angle type, did not begin until about 24 Ma. A similar stress change, marked by a similar change in dike and vein orientations, occurred throughout the southwestern United States and northern Mexico. The time of change is not well constrained in Texas, but available information allows it to have occurred at the same time thoughout the southern Cordillera. We suggest the earlier stress field is related to east‐northeast convergence between the Farallon and North American plates. The change in stress is approximately coincident with collision of the East Pacific Rise and paleotrench. Extension may be related to the change from a convergent to a transform margin along the western edge of North America. The changes in the stress field are accompanied by changes in the sources and compositions of magmas erupted in Texas. Contemporaneity of the changes in stress and magmatism indicates that they are related. Combined with regional age patterns, paleostress and geochemical data indicate that pre‐31 Ma magmatism in the southern Cordillera occurred in a subduction‐related, continental volcanic arc. Subsequent magmatism occurred in an environment of intraplate extension of the Basin and Range province.

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Early basin and range development in Trans‐Pecos Texas and adjacent Chihuahua: Magmatism and orientation, timing, and style of extension

Henry¹,

Price²

1986

J. Geophys. Res.

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Origin of Silver-Copper-Lead Deposits in Red-Bed Sequences of Trans-Pecos Texas: Tertiary Mineralization in Precambrian, Permian, and Cretaceous Sandstones

Cited by 3 publications

References 0 publications

Studies of geology and hydrology in the Basin and Range Province, southwestern United States, for isolation of high-level radioactive waste: Characterization of the Trans-Pecos region, Texas

Studies of geology and hydrology in the Basin and Range Province, southwestern United States, for isolation of high-level radioactive waste: Characterization of the Trans-Pecos region, Texas

Mid‐Cenozoic stress evolution and magmatism in the Southern Cordillera, Texas and Mexico: Transition from continental arc to intraplate extension

Early basin and range development in Trans‐Pecos Texas and adjacent Chihuahua: Magmatism and orientation, timing, and style of extension

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