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Fluid systems and fracture development during syn-depositional 1 fold growth: an example from the Pico del Aguila anticline, Sierras Exteriores, Southern Pyrenees, Spain.

Abstract : This paper reports an integrated, spatio-temporal analysis of the fracture-controlled paleo-fluid system in the Pico del Aguila anticline, a N-S trending fold located in the Sierras Exteriores, the southern front of the Spanish Pyrenees. Eight fracture sets (joints or faults) are recognized throughout the fold and are separated into a fracture sequence that is defined using field relationships and the remarkable temporal constraints offered by the syn-tectonic sedimentary deposits. This fracture sequence records a complex Paleocene to Early Oligocene structural evolution, including map-view, clockwise rotation and tilting of the fold axis. The geochemical analysis of calcite cements from the different mineralized fracture/vein sets reveals a compartmentalized fluid system during most of fold development. This initial paleofluid system was later perturbed when bending-related fractures associated with foreland flexure and outer arc extension triggered small-scale, vertical fluid migration. Fractures developed in shallow strata facilitated downward migration of surficial fluids that controlled the paleo-fluid system in the Late Priabonian/Stampian continental deposits. The study of the Pico del Aguila anticline depicts for the first time the evolution of a fluid system in a shallow, syn-depositional compressional setting, and results further strengthen the statement that fluids migrate vertically across stratigraphic boundaries take place during fold hinge-related deformation.
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Submitted on : Tuesday, November 18, 2014 - 10:32:15 AM
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Nicolas Beaudoin, Damien Huyghe, Nicolas Bellahsen, Olivier Lacombe, Laurent Emmanuel, et al.. Fluid systems and fracture development during syn-depositional 1 fold growth: an example from the Pico del Aguila anticline, Sierras Exteriores, Southern Pyrenees, Spain.. Journal of Structural Geology, Elsevier, 2015, 70, pp.23-38. ⟨10.1016/j.jsg.2014.11.003⟩. ⟨hal-01083732⟩

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