Inversion of a transfer system into lateral ramps: An example from the South-Central Pyrenees (Spain) |
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| Authors: | J F Flinch J M Casas |
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| Institution: | (1) Departament de Geologia Dinàmica, Geofísica i Paleontologia, Universitat de Barcelona, Zona Universitària de Pedralbes, E-08071 Barcelona, Spain;(2) Present address: Department of Geology and Geophysics, Rice University, 77251-1892 Houston, Texas, USA |
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| Abstract: | Field work in the South-Central Pyrenees suggests that omission contacts (i.e. younger over older rocks) occur at the base
of the Cadí unit (Cadí thrust), and pass laterally into thrusts. This change occurs across tear faults which are present in
the hangingwall of the Cadí thrust sheet and which controlled the deposition of Upper Cretaceous sediments (Adraén formation).
Detailed mapping in the contact area between the Nogueres and Cadí units has shown that the actual thrust geometry in the
study area is controlled by preexisting normal and transfer faults which developed in an already compressional context. Lateral
ramps or tear faults develop depending on the angle between the pre-existing extensional transfer fault and the thrust transport
direction. |
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| Keywords: | Pyrenees Cadí Nogueres Inversion Lateral ramps Transfer faults Tear faults |
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