Structural control on basaltic dike and sill emplacement, Paiute Ridge mafic intrusion complex, southern Nevada

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Late Miocene basaltic sills and dikes in the Paiute Ridge area of southern nevada show evidence that their emplacement was structurally controlled. Basaltic dikes in this area formed by dilating pre-existing vertical to steeply E-dipping normal faults. Magma propagation along these faults must have required less energy than the creation of a self-propagated fracture at dike tips and the magma pressure must have been greater than the compressive stress perpendicular to the fault surface. N- to NE-trending en echelon dikes formed locally and are not obviously attached to the three main dikes in the area. The en echelon segments are ... continued below

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27 p.

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Carter Krogh, K.E. & Valentine, G.A. August 1, 1996.

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Description

Late Miocene basaltic sills and dikes in the Paiute Ridge area of southern nevada show evidence that their emplacement was structurally controlled. Basaltic dikes in this area formed by dilating pre-existing vertical to steeply E-dipping normal faults. Magma propagation along these faults must have required less energy than the creation of a self-propagated fracture at dike tips and the magma pressure must have been greater than the compressive stress perpendicular to the fault surface. N- to NE-trending en echelon dikes formed locally and are not obviously attached to the three main dikes in the area. The en echelon segments are probably pieces of deeper dikes, which are segmented perhaps as a result of a documented rotation of the regional stresses. Alternatively, changes in orientation of principal stresses in the vicinity of each en echelon dike could have resulted from local loads associated with paleotopographic highs or nearby structures. Sills locally branched off some dikes within 300 m of the paleosurface. These subhorizontal bodies occur consistently in the hanging wall block of the dike-injected faults, and intrude Tertiary tuffs near the Paleozoic-Tertiary contact. The authors suggest that the change in stresses near the earth`s surface, the material strength of the tuff and paleozoic rocks, and the Paleozoic bedding dip direction probably controlled the location of sill formation and direction of sill propagation. The two largest sills deflected the overlying tuffs to form lopoliths, indicating that the magma pressure exceeded vertical stresses at that location and that the shallow level and large size of the sills allowed interaction with the free (earth`s) surface. 32 refs., 4 figs., 1 tab.

Physical Description

27 p.

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INIS; OSTI as DE96014431

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  • Other Information: PBD: Aug 1996

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  • Other: DE96014431
  • Report No.: LA--13157-MS
  • Grant Number: W-7405-ENG-36
  • DOI: 10.2172/373820 | External Link
  • Office of Scientific & Technical Information Report Number: 373820
  • Archival Resource Key: ark:/67531/metadc679927

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  • August 1, 1996

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  • July 25, 2015, 2:20 a.m.

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  • Feb. 26, 2016, 6:27 p.m.

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Carter Krogh, K.E. & Valentine, G.A. Structural control on basaltic dike and sill emplacement, Paiute Ridge mafic intrusion complex, southern Nevada, report, August 1, 1996; New Mexico. (digital.library.unt.edu/ark:/67531/metadc679927/: accessed September 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.