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Interacting tectonic faulting, karst subsidence, diapirism and continental sedimentation in Pleistocene deposits of the central Ebro Basin (Spain)

Published online by Cambridge University Press:  14 May 2014

JOSÉ LUIS SIMÓN ,
MARÍA ASUNCIÓN SORIANO ,
ANTONIO PÉREZ ,
ARÁNZAZU LUZÓN ,
ANDRÉS POCOVÍ  and
HÉCTOR GIL
JOSÉ LUIS SIMÓN*
Affiliation:
Dpto Ciencias de la Tierra, Universidad de Zaragoza, 50009 Zaragoza, Spain
MARÍA ASUNCIÓN SORIANO
Affiliation:
Dpto Ciencias de la Tierra, Universidad de Zaragoza, 50009 Zaragoza, Spain
ANTONIO PÉREZ
Affiliation:
Dpto Ciencias de la Tierra, Universidad de Zaragoza, 50009 Zaragoza, Spain
ARÁNZAZU LUZÓN
Affiliation:
Dpto Ciencias de la Tierra, Universidad de Zaragoza, 50009 Zaragoza, Spain
ANDRÉS POCOVÍ
Affiliation:
Dpto Ciencias de la Tierra, Universidad de Zaragoza, 50009 Zaragoza, Spain
HÉCTOR GIL
Affiliation:
Dpto Ciencias de la Tierra, Universidad de Zaragoza, 50009 Zaragoza, Spain
*
†Author for correspondence: [email protected]
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Abstract

During Early, as proposed by the International commission on stratigraphy Pleistocene times, interacting fluvial and aeolian processes constructed wide alluvial plains over an evaporite-dominated Miocene substratum in the central Ebro Basin. An exceptional site where these deposits show faults, folds, diapirs, karst structures and unconformities has been studied in detail. Analysis of particular structures demonstrates the interaction by that time of tectonic faulting, diapirism, karstification and sedimentation in an area where deformation was traditionally linked to the presence of underlying evaporites, without proposing any precise mechanism. Multiple approaches (sedimentology, structural geology and geophysics) have been used in order to discriminate the origin of each type of structure as well as to understand the interaction between different processes. Numerous normal faults and fractures of variable size are consistent with the regional stress field. Pleistocene deposits are pierced by diapirs of Miocene evaporites and disrupted by karst structures with different geometries (tubular, funnel and vault), both partially controlled by tectonics. The example described is proposed as an analogue model that could successfully illustrate evolution patterns of basins of potential interest for petroleum geology where similar processes have actuated, resulting in complex stratigraphical architectures.

Keywords

mantled karstextensional tectonicsdiapiralluvial depositsaeolian depositsPleistocene
Type
Original Articles
Information
Geological Magazine , Volume 151 , Issue 6 , November 2014 , pp. 1115 - 1134
Copyright
Copyright © Cambridge University Press 2014 

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