Central caldera collapse complex - implications for extensional tectonics for Basin and Range province
The Basin and Range Province, being one of the youngest tectonically rejuvenated terrains, exhibits a series of concentric patterns that are identifiable on a computerized, shaded, relief map. The concentric patterns in the Nevada and Utah portions of the Basin and Range coincide with the track of crustal plutonism and volcanism dating from the Cretaceous, and described in detail by G.P. Eaton in 1979. This observation implies a genetic relationship between plutonism and detected concentric patterns. Numerous geotectonic and economic implications are associated with observed concentric patterns. These patterns appear to be centers of crustal extension and rifting. A gravitational collapse of the overlying sedimentary strata into the spreading centers results in observed thrusting, block faulting, and segmentation, resulting in megacalderalike concentric rims. Most of the gravitational thrusting and imbrication is achieved by sedimentary plate movements on a low-angle detachment zone. This low-angle detachment zone, described by B. Wernicke in 1981, may be rooted in the lower crust. The economic implications for mineral and hydrocarbon exploration are enormous in this province. Many researchers have identified an association of mineral accumulations and oil production with areas where concentric rims intersect with each other, or with straight lineaments.
- Research Organization:
- Geosphere Consulting, Boulder, CO
- OSTI ID:
- 5906360
- Report Number(s):
- CONF-870915-
- Journal Information:
- AAPG (Am. Assoc. Pet. Geol.) Bull.; (United States), Vol. 71:8; Conference: American Association of Petroleum Geologists Rocky Mountain Section meeting, Boise, ID, USA, 13 Sep 1987
- Country of Publication:
- United States
- Language:
- English
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