Extensional Tectonics in the Basin and Range Province by Brian P. Wernicke, J. Kent Snow, Gary J. Axen, B. Clark

By Brian P. Wernicke, J. Kent Snow, Gary J. Axen, B. Clark Burchfiel, Kip V. Hodges, J. Douglas Walker, Peter L. Guth(auth.)

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Published through the yank Geophysical Union as a part of the Field journey Guidebooks Series.

The function of this box journey is to envision the tectonic heritage of 1 of the planet's best-exposed intracontinental rifts, the Basin and diversity province. The journey is administered as a transect on the range of Las Vegas, Nevada, the place the province is comparatively slim (about 360 km measured east-west). whereas the emphasis of the journey is on Cenozoic extensional tectonics, a lot of the dialogue will heart on pre-Cenozoic geology, because the pre-extensional geological framework needs to be completely understood in an effort to piece jointly the extensional background. as the quantity of crustal pull-apart is huge (about 250 km orientated west-northwest) fragments of crust preserved in commonly separated basin levels are just like each other, and in a few instances pre-extension geologic beneficial properties inside of those fragments give you the foundation for exact tectonic reconstructions.

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Additional info for Extensional Tectonics in the Basin and Range Province Between The Southern Sierra Nevada And The Colorado Plateau: The Basin And Range Province of Southern Nevada And Southeastern California June 30-July 7, 1989

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2--4: Imbricate thrusts in the duplex developed within the Mormon thrust plate, northeastern Mormon Mountains, showing the location of the floor thrust (arrows). Light rocks above and below the floor thrust are upper £bb3 and the dark rocks above are lower €bb4 (Figure 2-3). The £bb3-£bb4 contact is shown by dots. View is to the north-northeast. g. The structural Wernicke and Axen, 1988]. expression of uplift here is principally steep, plateau-sid~own faulting. At Stop 2-1, we will see a flexural response to the unloading, without significant steep faulting.

Note the abrupt upward flexure of the Plateau margin a) and the initial trajectories of the Mormon Peak and Tille Springs detachments relative to the Mormon-Tule Springs thrust c). See Figures 0--4 and 2-1 for location. 2-2). The initial trajectories of the detachments, depicted in Figure 2-2c, suggest some influence' of the thrust system on them. The Castle Cliff detachment developed almost entirely within the thrust autochthon, and initiated with the steepest average dip. The Tule Springs system, on the other hand, initiated in part in the hanging wall of the Tule Springs thrust, but flattened into subhorizontality along the footwall Jurassic decollement.

1977] deposited by a major river system, and a younger sequence broadly correlative with the Horse Spring Formation of the 'Lake Mead region [Bohannon, 19841the younger deposits consist of conglomerate, sandstone, siltstone, claystone, lacustrine limestone, and subordinate tuff. , 1988]. The basins are spatially related to major extensional faults of the Sheep Range deta~hment system. These faults dip to the west under the basins, and the basin fill was deposited on the upper plate of the extensional fault system.

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