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Alboran basin, Southern Spain. Part II: Neogene tectonic implications for the orogenic float model

Gómez Ballesteros, María and Rivera, Jesus and Muñoz, Araceli and Muñoz Martín, Alfonso and Acosta, Juan and Carbó Gorosabel, Andrés and Uchupi, E. (2008) Alboran basin, Southern Spain. Part II: Neogene tectonic implications for the orogenic float model. Marine and Petroleum Geology, 25 . pp. 75-101. ISSN 0264-8172

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Abstract

We infer that the Alboran Basin, the first western Mediterranean Basin found after crossing Gibraltar, is an orogenic float underlained by a de´ collement system, a multi-layered ductile shear extending from 10km to between 30 and 40km below sea level. This float was formed as consequence of the collision of the African–Eurasian plates in the Oligocene–late Miocene. Synchronous with this compression the float experienced basin wide crustal thinning and subsidence about 25 m/year ago by subcrustal processes. Since latest Miocene the float has undergone compression due to the continuous convergence of Eurasia and Africa. The faults created as a result of this compression are dominated by a conjugate system of northeast trending left-lateral and northwest right-lateral strike–slip faults. This deformation is taking place under a simple shear mechanism. Associated with the northwest and northeast lateral faults are zones of compression trending west and east of north extending from the base of the basin’s north upper slope to the Alboran Ridge. The initial morphology of the Alboran Ridge on the southern side of the Alboran Basin was due to the construction of a volcanic edifice at the northeast end of the ridge and igneous activity along northeast trending fractures southwest of the edifice. At the northeast end of the Alboran Ridge motion along a right-lateral fault cutting across the ridge led to sediment collapse and the creation of a prominent embayment on the ridge’s northwest flank. Deformation is more subdued in the western than in the eastern part of the Alboran Basin, a tectonic style due either to differences in sediment rheology or that the accommodation of the convergence of Africa and Iberia is more diffused and attenuated in the west than in the east.


Item Type:Article
Uncontrolled Keywords:Alboran Ridge; Alboran Basin; Carbonate mounds; Conjugate faults; Motril and Adra anticlines; Orogenic float; Stress regime (pure and simple shear); Serrata-Carboneras Fault
Subjects:Sciences > Geology > Geodynamics
ID Code:6223
Deposited On:18 Apr 2008
Last Modified:06 Feb 2014 07:47

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