Título del libro: The Sedimentary Basins Of The United States And Canada
Título del capítulo: Laramide Sedimentary Basins and Sediment-Dispersal Systems
TIMOTHY FROST LAWTON;
Autores externos:
Idioma:
Inglés
Año de publicación:
2019
Palabras clave:
U-PB GEOCHRONOLOGY; GREEN RIVER FORMATION; DETRITAL ZIRCON GEOCHRONOLOGY; MCCOY MOUNTAINS FORMATION; STRAIGHT CLIFFS FORMATION; WESTERN UNITED-STATES; WILKINS PEAK MEMBER; FORELAND BASIN; ROCKY-MOUNTAINS; SOUTHERN UTAH
Resumen:
Intermontane basins developed adjacent to and between broken-foreland uplifts of the Laramide orogen in western North America during the time interval 76-38 Ma. The basin array consists of perimeter basins around the edge of the orogen, ponded basins in the interior of the orogen, and narrow, thick axial basins that lie along the eastern edge of the stable Colorado Plateau in a fairway of great structural relief, the front ranges, between the ponded and perimeter basins. The basins filled with continental strata that consist of, in order of proximity to active uplift margins, deposits of alluvial fans, braided and meandering rivers, and lakes. Lakes were largely restricted to the ponded basins, but some southern perimeter basins contained lakes during development of maximum structural relief. Lacustrine environments ranged from freshwater fluctuating profundal conditions, when lakes likely had outlets to exterior parts of the orogen, to evaporative conditions when basins lacked high-volume fluvial inflow and did not drain externally. Although climate may have influenced fluvial style, emerging data sets suggest that tectonic factors played important roles in facies tracts of ponded basins by instigating drainage capture, thereby altering fluvial routes, and creating barriers to basin outflow. Provenance data from sandstone petrology and UPb detrital-zircon analysis indicate the presence of intra-orogen and extra-orogen sediment routing systems. Intra-orogen drainages contributed sediment from local uplifts to adjacent basins; some of this sediment bypassed perimeter basins to exterior sinks, principally in northeastern Mexico and the Gulf of Mexico. Extra-orogen river systems transferred sediment from active and quiescent segments of the continental-margin arc to ponded basins, which tended to trap the sediment, and to exterior sinks. Subduction of a flat slab, rendered buoyant by a thick oceanic plateau that constitutes a conjugate to the Shatsky Rise of the present northwestern Pacific Ocean, drove crustal shortening in the Laramide orogen. Dynamic topography of the subducted plateau modulated orogenic uplift and enhanced traction coupling between the subducted plateau and continental lithosphere of North America to produce diachronous deformation and an evolving drainage network within the Laramide orogen. © 2019 Elsevier B.V. All rights reserved.
Entidades citadas de la UNAM:
ISBN:
9780444638953
Editorial:
Elsevier
