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Showing 1 to 20 of 49 for “"thrust faults"”.
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Field based study of thrust faults in the Appalachian Valley and Ridge Province Newport, Virginia
This study focuses on a series of thrust sheets exposed in the Appalachian Valley and Ridge Province Blacksburg-Pembroke area in southwest Virginia. Structures in the hanging wall of the Saltville thrust (Saltville thrust sheet) and the footwall of the Saltville thrust (Narrows thrust sheet) are …
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Geology of the Radford area, Virginia
… much of the Radford area is covered by three overthrust sheets which conceal formations that would otherwise be exposed in the area. The greatest movement along these low-angle thrust faults appears to be that of the Pulaski thrust sheet. It has a horizontal displacement of at least eight miles …
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3D Structural and Stratigraphic Architecture of the Northwest Santa Barbara Basin and Implications for Submarine Landslide Generation
… understanding of the relationships between faults, folds, stratigraphic architecture, and submarine landslides can be obtained with 3D seismic datasets. In this study we use an industry 3D seismic-reflection volume that encompasses the slope and shelfbreak surrounding the Gaviota submarine …
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Field-based Constraints on the Origin of the Benton Uplift, Ouachita Mountains
… Mountains are an east-west trending fold-and-thrust belt exposed in west central Arkansas and southeastern Oklahoma. The Mississippian-Pennsylvanian Ouachita orogeny occurred when the Sabine arc terrane collided during south-facing subduction, during closure of the Cambrian passive margin of …
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Mechanisms of late-stage rift deformation: evidence from new 3D seismic data over the West Iberia margin
… sediments are cut by more small-scale normal faults in the north. I hypothesize that extension within the frontal basin was constrained by basement topography, specifically a small mantle ridge identified at the southern extent of the basin that may have obstructed the extension of the …
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Kinematic implications of football structures
Folding prior to thrust-sheet emplacement is proposed to explain presence of overturned synclines in the footwalls of many thrust-faults in the Appalachian foreland fold- and thrust-belt of southwest Virginia. Investigation of relations in the footwalls of the Saltville and St. Clair thrust-sheets …
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Cenozoic extension superimposed on a Mesozoic thrust belt, central Nevada
The central Nevada thrust belt (CNTB) is a north-south trending belt of contractile structures in the hinterland of the Sevier orogenic belt. This study tests the hypothesis that analysis and regional correlation of CNTB structures is possible after retrodeformation of younger extensional faults; …
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Structural Style and Regional Comparison of the Paleoproterozoic Ketyet River Group in the Region North-Northwest of Baker Lake, Nunavut
… schists. D1 recumbent isoclinal folds and thrust faults caused multiple structural repetitions of the Neoarchean and Paleoproterozoic strata. D2 coaxially refolded D1 structures, producing type 3 “hook” interference patterns. D1 structures were generally transposed sub-parallel to the …
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Structural Analysis of Ernst Tinaja Canyon Focusing on Strike-Slip Faulting and Folding, Big Bend National Park, Texas
… in the study area including folds, normal and thrust faults and a previously unmapped, large dextral strike-slip fault, with associated negative flower structure. Theories for the mechanisms and kinematics of deformation are discussed and a model is presented for the overall tectonic history of …
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Seismic interpretation and structural analysis of the Alleghanian fold-thrust belt in Central Alabama
In the central part of the Alleghanian fold-thrust belt of Alabama, multi-channel seismic and well log data are used to analyze structural elements of the thrust belt. Six horizons were interpreted on the seismic data in two-way travel time and were depth-converted using interval velocities derived …
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Lithospheric dynamics of Earth’s subduction zones and Martian tectonic provinces
… Numerical simulations show that normal faults first appear on the seaward side of a subducted seamount, followed by thrust faults on the landward side of the seamount. In Chapter 4, I use the latest Martian gravity and topography data to constrain spatial variations in lithospheric …
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Mesoscopic analysis of folds in the Briggs Formation, Malone Mountains, Texas
… large- scale folds and the surfaces of several thrust faults approximate the plane along which the intermediate- and small-scale folds are distributed. Thus, it appears that folding on all orientations, and thrusting are part of the same, perhaps protracted deformation. The sense of tectonic …
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Displacement transfer mechanisms in a portion of the Narrows/Copper Creek thrust sheet, Southwestern Virginia
… along the contiguous Narrows and Copper Creek thrusts in southwestern Virginia has generated a series of regional folds and second-order faults between their surface terminations. These structures form a complex system which accommodates shortening within a region where no major thrust faults …
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Lithospheric dynamics of Earth's subduction zones and Martian tectonic provinces
… simulations show that a group of normal faults would first appear on the seaward side of a subducted seamount, followed by a group of thrust faults on the landward side of the seamount. In Chapter 4, I use the most recent Martian gravity and topography data to constrain spatial variations …
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Geology of the Damascus area
… and four anticlines and are broken by two major thrust faults, and Lodi thrust and the Holston Mountain thrust. The faults were initially low-angle thrusts which have been folded with the overridden rocks so that locally the fault planes have steep dips.
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Architecture of the Silurian sedimentary cover sequence in the Cadia porphyry Au-Cu district, NSW, Australia : implications for post-mineral deformation
… at the end of the Benambran Orogeny. N-striking faults, including the curviplanar, northerly striking, moderately west-dipping basement thrust faults of the Cadiangullong system, developed early in the district history. NE-striking faults formed during rifting in the late Silurian. Subsequent E-W …
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Characterizing the southeast Caribbean-South American plate boundary at 64°W
… crust along the weakened, former passive margin. Thrust faults flanking the strike-slip system to the north and south dip systematically toward the plate boundary. These faults have been previously interpreted as delineating a 300 km-wide diffuse plate boundary zone, caused by oblique convergence …
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A Gis Investigation of Regional Geologic Controls on Mercury Deposits in the Southwest Region of Arkansas
… between mercury deposits and regional faults or changes in lithology, both of which have been suggested (Clardy and Bush, 1976) to explain the narrow band of permissive host rock for the deposits. GIS was used to determine which mode of deposition (structural features or lithologic …
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Kinematic models of interseismic deformation in Southern California
… near San Bernadino (6.6 [plus-minus] 2.7 mm/yr). Thrust faults underneath Los Angeles, the Ventura Basin, and the San Gabriel range front all exhibit active shortening from 0.5 to 13.5 mm/yr. We suggest that differences between paleoseismic and block model slip rate estimates may be explained by …
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Cenozoic Evolution of the Gold Creek Basin, Western Montana: Mapping and Documenting the Geology of the Rock Creek Lake 7.5' USGS Quadrangle
… to the north. Synthetic top-to-the-east normal faults throughout the study area are interpreted as joining the main detachment at depth. Granitic and metamorphic rock fragments observed during provenance studies of sandstones and conglomerates indicate the initial opening of the Gold Creek basin …
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