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Showing 1 to 20 of 39 for “"Precambrian Basement"”.
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Petrology and structure of the buried Precambrian basement of Colorado, The
Includes bibliographical references.
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Potassic alteration of Cambrian-Ordovician sandstones and Precambrian basement rocks of the North American midcontinent
… zone, and a lowermost feldspar zone. Uppermost Precambrian basement exhibits potassic alteration similar to the overlying Mt. Simon Sandstone. Sericite in the basement rock was likely formed during the same episode as in the Mt. Simon Sandstone, based on similar $\delta\sp{18}$O values. A K/Ar …
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Kaolinitic weathering zone on Precambrian basement rocks, Red River Valley, eastern North Dakota and northwestern Minnesota
… Project has provided new information on the Precambrian basement of eastern North Dakota and northwestern Minnesota. Basement rocks in this area consist of intermediate to felsic coarse-grained massive or gneissic rocks, and intermediate to mafic metavolcanic and metasedimentary schists. The …
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Precambrian Basement Influence on the Deposition of the Upper Ordovician Utica Shale Play in East Central Ohio
… (Utica/Point Pleasant), suggesting movement of basement blocks along pre-existing Proterozoic basement faults creating localize topographic highs and lows. The Utica shale also thickens along the northern side of the study area, suggesting that the Sebree Trough further extends into northeastern …
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The Midcontinent exposed: Precambrian basement topography, and fault-and-fold zones, within the cratonic platform of the United States
… American craton. This region is underlain by Precambrian basement formed dominantly during Proterozoic accretionary orogenies. It was modified by Proterozoic anorogenic felsic magmatism and was cracked by several episodes of rifting. Subsequently, when North America was part of a …
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Delineating of the Utica Shale/Point Pleasant Formation Play System to Determine Influence of the Precambrian Basement in Northeastern Ohio
… of the controls on deposition of this system. Precambrian basement features have long been known to affect deposition of older strata near these features across Ohio, but the effects of far field tectonics is not fully agreed upon. Precambrian faults and lineaments are known to exist and have …
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An Investigation of 3D Seismic Deep Basement Events in Osage County, Oklahoma
<p>Deep basement events seen in 3D seismic surveys located in Osage County, Oklahoma can be observed and may have affect overlying sedimentary formations. The 3D surveys used in this study are on the Chautauqua platform about fifty miles northwest of Tulsa, Oklahoma. Stratigraphy of the work area …
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Geothermal regime of the Williston Basin in North Dakota
… relationships gives insight into the effect of basement heat production on the thermal state of the basement rocks and the overlying sedimentary successions. These relationships provide valuable insight on the radioactive heat contribution to heat flow, heat flow from the lower crust, …
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Identification, Characterization and Analysis of Wrench Related Faulting in Southwestern Warren County, Kentucky
… profiles of the subsurface extending down to the Precambrian basement. Analysis of these profiles revealed a number of 'pop-ups' or possible wrench-related structures that can be traced upward through faulting from the Precambrian basement through the Knox Group and into the Mississippian section. …
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Gravity Modeling, Seismic Stratigraphy, and Thermal Maturity Modeling of Hydrocarbons of the Permian Foreland Basin, USA, and the Sergipe-Alagoas Rifted-Passive Margin, Brazil
… northern Permian Basin. I inferred the AGM as a Precambrian rift zone composed of lower density granitic and metasedimentary rocks. Basement structure defines the limits of deep basinal areas that may host productive, thermally mature source rock kitchens controlled in part by strike-slip faults …
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Three-dimensional modeling of complex salt wall terminations in the Paradox Basin: implications for salt structure evolution, compartmentalizing fault trends and petroleum exploration
… of the basin by northeast-southwest-trending Precambrian basement structures. This has resulted in the abrupt or abnormal terminations of these salt structures observed in the basin today. Previously, minimal research was conducted on these salt wall terminations, perhaps due to their complex, …
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Pre-Grenville ages of basement rocks in central Virginia: a model for the interpretation of zircon ages
Late to Middle Precambrian basement rocks in the Blue Ridge of Central Virginia represent a heterogeneous admixture of highly deformed gneisses, paragneisses and igneous intrusives, which have undergone multiple periods of metamorphism. Isotopic U-Pb age determinations on the Lovingston Formation …
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A seismic reflection study over the Bane anticline in Giles County, Virginia
… of the Cambrian sedimentary sequence and Precambrian basement rocks believed to underlie the Bane anticline, it was concluded that an unbroken Cambrian sequence overlying the basement could not produce reflection coefficients of the magnitude required, but that a thrust fault could. No …
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Regional-Scale Impacts of Fluid Composition and Geologic Structure for Injection-Induced Seismicity in the Southern U.S. Midcontinent
… The Arbuckle is hydraulically connected to Precambrian basement through an extensive fracture system, which transmits pressure perturbations from wastewater injections to seismogenic depths. Previous studies have convincingly attributed induced seismicity to pore pressure diffusion and solid …
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Geochemical and petrologic study of the Fries-Rockfish Valley Fault near Roanoke, Virginia
… and central Virginia is a complex slice of Precambrian basement emplaced on the margin of Laurentia during collisional events in the Paleozoic. This allochthonous basement is composed of Middle Proterozoic continental crust, Late Proterozoic intrusives, and Late Proterozoic-early Paleozoic …
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Evolution of the Kingman Arch, southern Nevada
… samples collected from a 4.5 kilometer thick Precambrian section in the central McCullough Range. 40Ar/ 39Ar data suggest slow cooling of the Kingman Arch between 1000 to about 560 Ma. Cessation of cooling is coincident with deposition of the Cambrian Tapeats Sandstone. Paleozoic and Mesozoic …
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Stratigraphic Variations in the Carboniferous Section Across the Arkansas-Oklahoma State Line Arch
… linking Mississippian-aged Waulsortian mounds to Precambrian Spavinaw granite structures of northeastern Oklahoma and southwestern Missouri suggests Precambrian basement structures may extend into the study area. The structural nature of the arch provided an environment favorable to carbonate …
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Tectonic history of Billings and southern McKenzie Counties, southwestern North Dakota
… a total of 45 log markers were picked from the Precambrian basement and the Pierre Formation (Cretaceous). Structural maps were used in conjunction with trend surface residuals to define structures. Isopach map patterns, along with subsidence analysis were used to identify episodes of tectonic …
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Proterozoic structures in north-central North Dakota: a gravity study
… anomalies due to density variations in the Precambrian basement. Four east-west gravity profiles were constructed and modeled with a two dimensional polygonal method (Talwani et al . , 1959) . A fifth profile was constructed and modeled, after gravity modeling of the first four indicated …
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Geochemistry and Basin Analysis of Laramide Rocky Mountain Basins
… the spatial evolution of the paleotopography and Precambrian basement erosion in late Cretaceous-early Eocene. In addition it uses the sedimentology, detrital zircon U-Pb geochronology, and isotope paleoaltimetry of early Eocene sedimentary strata to constrain the tectonic setting, paleogeography …
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