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Transición dúctil-frágil en la corteza de la zona central de la Península Ibérica

Tejero López, Rosa María and Ruiz Pérez, Javier (1999) Transición dúctil-frágil en la corteza de la zona central de la Península Ibérica. Geogaceta, 27 . pp. 163-166. ISSN 0213-683X

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Abstract

Brittle-ductile transition is estimated on the basis of pore-pressure dependent frictional failure in the
brittle regime, and power-Iaw steady-state creep in the ductile regime. Structure and lithological composition
of the Centrallberian Peninsula Crust combined with geotherm are used to generate rheological profiles.
Two brittle-ductile transitions are shown in the crust. The shallower one is located at "" 7 km under
compressional stress es, and at "" 9 km under tensional stresses. The deepest is located at the top of the
middle crust, at "" 14 km in compression and "" 17 km in tension regime. Below it, the material is ductile
throughout, with a jump in strength at the Moho, which is a main rheological discontinuity. Upper part of
lithospheric mantle behaviour is dominated by brittle mechanisms when the crust thickness is30 km, but
ductile mechanisms prevail in 34 km crust thickness.


Item Type:Article
Uncontrolled Keywords:Brittle-ductile transition, Rheology, Continental crust
Subjects:Sciences > Geology > Geodynamics
ID Code:16964
Deposited On:31 Oct 2012 11:06
Last Modified:31 Oct 2012 11:06

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