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Showing 1 to 20 of 23 for “"unroofing"”.
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The unroofing history of the funeral mountains metamorphic core complex, California
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1994.
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Provenance of Eastern Magallanes Foreland Basin Sediments: Mineralogical and Geochemical Analyses Reveal Paleogene Tectonic Unroofing of the Fuegian andes
<p>Though southern South America and the Antarctic Peninsula were previously connected through a Paleozoic-Mesozoic subduction system on the western margin of Gondwana, this connection was tectonically disrupted in the Cenozoic by forming the Drake Passage in the Scotia Sea. Heavy mineral …
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Multidisciplinary analysis of a polymetamorphic terrane, western New England
… affected by superimposed metamorphisms, and the unroofing history of an area that records only the youngest metamorphism. The area chosen for the study of polymetamorphism, northwestern Connecticut and adjacent New York and Massachusetts, records Taconian (Ordovician) peak metamorphic effects in …
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Structural constraints on the exhumation of the Tso Morari Dome, NW Himalaya
… continued exhumation occurred by progressive unroofing along a younger, brittle-ductile detachment. Through a rolling-hinge mechanism similar to that proposed for many metamorphic core complexes of the North American Cordillera, this unroofing led to the development of the culmination into a …
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Provenance and tectonic significance of the Lower Paleozoic Douglas Conglomerate, northern Churchill Mountains, Antarctica
… granitic batholiths it does not record the unroofing of these plutons. Therefore, it is probably older than the intrusives and was deposited in response to an earlier tectonic event.
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Depositional history of the Black Mountain conglomerate, Mohave County, Arizona: Sedimentary response to Miocene extension
… along Wilson Ridge and whether there is an unroofing sequence preserved within the basin. Stratigraphic sections from four locations were measured to capture the vertical succession of clastic and volcanic rocks and correlated to determine the lateral variability within the basin. Data …
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Provenance and depositional environments of the upper Permian-lowermost Triassic fluvial and lacustrine sandstones, Wutonggou low-order cycle, Bogda Mountains, NW China
… improves our understanding of the nature and the unroofing history of ENTS and factors in controlling compositions and textures of fluvial-lacustrine sandstones"--Abstract, page iv.</p>
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Structural evolution of the Max Meadows thrust sheet, Southwest Virginia
… thrusting. These changes may reflect erosional unroofing during uplift and thrust sheet emplacement.
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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
… Gold Creek basin was contemporaneous with the unroofing of the Anaconda metamorphic core complex. The upper Renova Formation observed in the study area is equivalent to the upper Renova Cabbage Patch beds best developed in the Flint Creek basin to the west and indicate primarily lacustrine, …
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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
… Gold Creek basin was contemporaneous with the unroofing of the Anaconda metamorphic core complex. The upper Renova Formation observed in the study area is equivalent to the upper Renova Cabbage Patch beds best developed in the Flint Creek basin to the west and indicate primarily lacustrine, …
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Kinematic and flexural isostasy modeling in central nepal: using erosional, depositional, and cooling histories to validate a balanced cross section
… from the hinterland. The timing of erosional unroofing and deposition implied by the flexural isostasy model is inconsistent with provenance data from the foreland basin, suggesting that the implied kinematic sequence is not viable or that new timing constraints should be chosen. Because the …
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Biostratigraphy of Cretaceous and Paleogene Strata from Northern Yukon Territory and District of Mackenzie, Northwest Territories
… inverted providing evidence for progressive unroofing of the orogenic wedge during Cordilleran orogenesis. This research provides a foundation for regional geologic mapping, basin evolution studies and resource assessment in these northern Canadian basins.
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Fluid inclusions: evidence for a counterclockwise P-T trajectory in the Central Maine terrane of South-Central Massachusetts
… below peak recorded temperatures before eventual unroofing. Evidence for this path includes sillimanite pseudomorphs after early andalusite, abundant cordierite in pelitic lithologies, late replacement of low-P cordierite-bearing assemblages by high-P garnet-bearing assemblages, recrystallization …
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Characterization of a volcanically impacted, overfilled continental rift basin within the southeastern Jemez Mountains, New Mexico
… of volcanism. This pattern contrasts with unroofing of progressively older rocks to provide sediment into a conventional rift basin. Pyroclastic-flow, surge, fall, and block-and-ash-flow deposits dominate the stratigraphic record with fewer hiatuses as basin filling progressed. In the …
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Paleoenvironmental and tectonic reconstruction of the lower Eocene Ghazij Formation and related units, Balochistan, Pakistan: Implication for India -Asia collision
… compressional suture zone in the north. The unroofing pattern and uplift geometry of the western Indian shelf suggests that India first collided in the southern part of the study area (Kalat-Khuzdar area) during the late Paleocene-early Eocene along a transpressional suture and proceeded …
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Stratigraphic response to Cordilleran processes along the south central Andean margin
… coarsening stratigraphic trends, erosional unroofing, deformation, and magmatic high flux events provides new evidence of upper-plate Cordilleran feedbacks driven by changes in subduction regime. This chapter will be submitted to Lithosphere with coauthors Brian Horton, Chelsea …
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⁴⁰Ar/³⁹Ar and U-Pb geochronological constraints on the thermal and tectonic evolution of the Connemara Caledonides, Western Ireland
… and deformation, rather than differential unroofing of the orogen. 40Ar/ 39Ar dates older than the onset of magmatism or younger than a regional Silurian unconformity represent the combined effects of excess 40Ar contamination, metasomatism, thermal resetting or alteration related to …
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Geology of the Phil Pico Mountain Quadrangle, Daggett County, Utah, and Sweetwater County, Wyoming
… Formation is clearly synorogenic and contains an unroofing succession from the adjacent Uinta Mountains. On Phil Pico Mountain, the Wasatch Formation contains clasts eroded sequentially from the Permian Park City Formation, Permian Pennsylvanian Weber Sandstone, Pennsylvanian Morgan Formation, and …
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Paleogeography of Western North America: Insights from Detrital Zircon U-Pb Geochronology and Hf Isotope Geochemistry
… the Paleozoic and Mesozoic cratonal blanket to unroofing of distant basement cored-uplifts and Laramide plutons, then a final transition to more local Laramide uplifts. Hf isotopes were also collected on zircons from the San Juan basin, and also for a select group of samples of the Paleocene …
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Tectonics of the lower Susquehhanna River region, southeastern Pennsylvania and northern Maryland: late proterozoic rifting to late paleozoic dextral transpression
… and associated change in stress array suggests unroofing during transpression, consistent with the decrease in metamorphic grade. Post-transpressional deformation produced a pair of conjugate cleavages in the lower Susquehanna River region, and determined orientations of the principal …
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