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Showing 1 to 20 of 53 for “"Laramide"”.
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Laramide and post-Laramide stratigraphy and tectonism on the southeast flank of the Fra Cristobal mountains, New Mexico
Includes bibliographical references.
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Geochemistry and Basin Analysis of Laramide Rocky Mountain Basins
The Laramide Rocky Mountains in western U.S.A is an important topographic feature in the continental interior, yet its formation and evolution are poorly constrained. This study uses the oxygen and strontium isotope geochemistry of freshwater bivalve fossils from six Laramide basins in order to …
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Laramide synorogenic sedimentation in south-central New Mexico: petrologic evolution of the McRae Basin
Includes bibliographical references.
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Laramide transpression and oblique thrusting in the northeastern Front Range, Colorado: 3D kinematics of the Livermore Embayment
… σ1 analysis of minor fault data shows regional Laramide σ1 was subhorizontal and unidirectional at 085°, refuting previous hypotheses for the area invoking a dominance of vertical motions during Laramide deformation. Variable σ1 trends at individual locations provide evidence for strain …
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A PETROLEUM SYSTEM STUDY OF THE CRATONIC WILLISTON BASIN IN NORTH DAKOTA, U.S.A.: THE ROLE OF THE LARAMIDE OROGENY
The Williston Basin is a Phanerozoic intracratonic basin located in the northern USA (North Dakota, South Dakota and Montana) and southern Canada (Manitoba and Saskatchewan). The basin is known as a major hydrocarbon-producing basin in North America, with a petroleum system characterized by …
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Tectonic development of Proterozoic structures and their influence on Laramide and Miocene deformation, north Virgin Moutains, SE Nevada and NW Arizona
… shear zones later controlled the geometry of Laramide and Miocene brittle deformation. The Proterozoic basement in the core of the VMA now resides at elevations of more than 2 km above sea level, roughly 2.5 km higher than the elevation of basement in the adjacent Colorado Plateau. The …
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Laramide stress conditions and deformation mechanisms during the formation of Hudson and Dallas Domes, Lander Quadrangle, Wind River Mountains, Lander, Wyoming
Laramide fold forms along the northeastern flank of the Wind River Mountains in west central Wyoming include a series of doubly plunging folds arranged in a left-stepping en echelon pattern. The fold patterns and geometries are derived from regional scale tectonic stresses that were complicated by …
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The geology of the Elliston area, western Montana
… margin of the Boulder Batholith and within the Laramide disturbed belt. Strata ranging in age from Precambrian through recent are present, with all but the Ordovician, Silurian, and Triassic System& represented. The sedimentary rocks are mainly marine and continental carbonates, shales, and …
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Early Laramide Magmatism in Southern Arizona U-Pb Geochronology of Key Igneous Units and Implications for the Timing of Regional Porphyry Copper Mineralization
… in several distinct periods. During early Laramide time voluminous eruptions of intermediate volcanic rocks and the emplacement of mostly barren intrusive centers occurred in the region. Subsequent magmatism resulted in the emplacement of numerous productive (porphyry copper) deposits, …
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Geology of the Northern Alto Relex Area, Big Bend National Park, Brewster County, Texas
… rocks in the area were folded and faulted by Laramide compression, intruded by Tertiary sills and overprinted by high-angle normal faults from Basin and Range extension. During the Laramide Orogeny and Basin and Range extension, the underlying basement shear zone called, the Texas Lineament, …
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Stratigraphic signatures of convergent orogenesis from the plate interior : studies from Tibet and the southern Rocky Mountains
… Chapter 3 investigates the record of easternmost Laramide deformation in the southern Rocky Mountains. Detrital zircon U-Pb geochronology of Cretaceous through Eocene sedimentary units in the Raton basin provides new constraints on the uplift and exhumation of the Sangre de Cristo range, revealing …
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Paleogeography of Western North America: Insights from Detrital Zircon U-Pb Geochronology and Hf Isotope Geochemistry
… thin-skinned thrusting through the formation of Laramide basement block uplifts was accomplished by conducting U-Pb geochronologic and Hf isotopic analyses on 32 detrital zircon samples from across the entire San Juan basin. The detrital zircon U-Pb results indicate four stratigraphic intervals …
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Structural Analysis of Ernst Tinaja Canyon Focusing on Strike-Slip Faulting and Folding, Big Bend National Park, Texas
… Orogeny and the Cretaceous-early Tertiary Laramide Orogeny, Tertiary volcanism, and Basin and Range extension. The study area is in Big Bend National Park on the western slopes of the Sierra Del Carmen range at Ernst Tinaja, an erosional pothole in the Cretaceous Buda Limestone. The pothole …
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Multiscale Integration of Empirical Geologic Observations with Quantitative Structural Modeling to Constrain Late Cretaceous to Eocene Paleostress Environments on the Colorado Plateau
… on regional tectonic stress and associated Laramide deformation across the Colorado Plateau. Laramide deformation is evidenced by basement-cored uplifts bound by doubly plunging monoclinal folds. Blind basement fault geometries are estimated with trishear fault-propagation models and …
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Mesoproterozoic tectonic evolution of southwestern North America : protracted intracratonic deformation, sedimentation, and differential exhumation in Grand Canyon and the Rocky Mountain Region
… insight into tectonics of southern Laurentia: 1) Laramide-style (monoclines) deformation in the continental interior at 1250 Ma records Grenville-age shortening; 2) 1.1 Ga detrital muscovite (Ar/Ar) and zircon (U/Pb) indicate that an Unkar Group source in the Grenville highlands during development …
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Structural Analysis of the Northwest Wind Mountain Quadrangle, New Mexico: Proterozoic Shearing to Cenozoic Brittle Faulting in the Burro Mountains
… been reactivated during Mesozoic rifting, the Laramide orogeny, and Basin and Range extension. The northeast-southwest trending faults most likely formed as joints during uplift of the Ancestral Rocky Mountains or the Laramide orogeny. This fault system produced the positive flower structures …
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Geophysical constraints on the flexural subsidence of the Denver Basin
The Denver Basin is an asymmetric Laramide (Late Cretaceous through Eocene) foreland basin covering portions of eastern Colorado, northwestern Kansas, southwestern Nebraska, and southeastern Wyoming, USA. It is bordered on the west by the Rocky Mountain Front Range Uplift, a basement cored Laramide …
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Controlling factors on Mesozoic and Cenozoic metamorphism and deformation in the Maria Fold and Thrust Belt and Colorado River Extensional Corridor, Southeastern California and Western Arizona
… structures are at odds with the Sevier and Laramide thrust belts and the Basin and Range Extensional Province surrounding these areas, a fact that remains largely unexplained. Data pertaining to metamorphic grade, deformational structures, and plutonism are compiled and reported in order to …
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Tectonics of the Uinta Recess in the Sevier Fold-Thrust Belt, Utah
… fold-thrust belt, and the affects of later (Laramide) uplift and Tertiary extension.
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