The Sheep Pass Formation,syn-convergent extension in the Sevier Orogen - Druschke, Peter
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The Cretaceous to Paleogene Sevier orogen of western North America is considered an ancient high-elevation plateau, broadly analogous to the modern Andean Altiplano. The Sevier orogen has since undergone extension and topographic collapse and today is occupied by the Basin and Range Province, a region of narrow mountain belts separated by broad fault-bounded valleys. The prevailing geological models suggest that the Sevier hinterland was a low-relief, tectonically quiescent plateau during the Late Cretaceous and Paleogene. New geologic mapping of the Sheep Pass Formation type section of Nevada…mehr

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Produktbeschreibung
The Cretaceous to Paleogene Sevier orogen of western North America is considered an ancient high-elevation plateau, broadly analogous to the modern Andean Altiplano. The Sevier orogen has since undergone extension and topographic collapse and today is occupied by the Basin and Range Province, a region of narrow mountain belts separated by broad fault-bounded valleys. The prevailing geological models suggest that the Sevier hinterland was a low-relief, tectonically quiescent plateau during the Late Cretaceous and Paleogene. New geologic mapping of the Sheep Pass Formation type section of Nevada indicates that deposition occurred in response to normal fault movement, with deposition of the basal Sheep Pass Formation bracketed as latest Cretaceous based on new absolute age control data. These data suggest that an ancestral Basin and Range occupied portions of the Sevier hinterland tens of millions of years prior to the onset of the modern Basin and Range. This study therefore strengthens comparisons of the Sevier hinterland to the Andean-Altiplano, as similar processes of plateau-top normal faulting have been documented in the modern Andes.
Autorenporträt
Peter Druschke received his doctorate from the University of Nevada Las Vegas in 2009. His studies have lead him across the western U.S, Mexico and China. For the past 6 years Peter has been employed by ExxonMobil as a senior petroleum geologist working on projects from the Gulf of Mexico, to West Africa, the Middle East and the Black Sea.