Origin of the Permian-Triassic Iberian Basin, central-eastern Spain



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Arche, Alfredo and López Gómez, José (1996) Origin of the Permian-Triassic Iberian Basin, central-eastern Spain. Tectonophysics, 266 . pp. 443-464. ISSN 0040-1951

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The Iberian Basin was an intracratonic rift basin in central-eastern Spain developed since Early Permian times. The
basin boundary faults were normal, listric faults controlling an asymmetric extension propagating northeast with time.
Hercynian or older lineaments controlled the orientation of the Iberian Basin and extension was accommodated
basically in the hanging wall block by the formation of secondary grabens and a central high. The basin was related with
the coeval Ebro, Catalan and Cuenca-Mancha Basins and their connections are discussed.
Subsidence curves show that the Early Permian-Early Jurassic period of extension can be subdivided into three rifting
episodes and a flexural one. Extension factor increases from 1.17 in the northwest to 1.29 near the Mediterranean coast.
The increasing extension rate was accommodated by transfer faults trending NNE-SSW, more important in the Levante
area. The rift evolution is intermittent and seems to reflect distinct stress fields.
The collapse of the late Hercynian orogen and related increased heat flux, extension and rifting is the most probable
origin of the Iberian Basin and related basins. The origin of the Catalan and the Valencia-Prebetic Basins is related to the
southwards migration of the Hesse-Burgundy Rift along the eastern margin of the Iberian Microplate.

Item Type:Article
Uncontrolled Keywords:Iberian basin; Rift basin; Asymmetric extension; Subsidence curves
Subjects:Sciences > Geology > Geodynamics
ID Code:17668
Deposited On:15 Jan 2013 10:44
Last Modified:11 Dec 2018 08:42

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