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Geometry and kinematic evolution of a long-living foreland structure inferred from field data and cross section balancing, the Sainte-Victoire System, Provence, France

Abstract : The Sainte-Victoire System (SVS) is a key area to understand how the shortening is accommodated in outer foreland of the Pyrenean-Provence orogen between Late Cretaceous and Eocene. Structural data, growth strata and fault slip analysis, and four balanced cross sections are used to decipher the along-strike geometry, deformational characteristics and kinematics of the SVS. The SVS is divided into two structural domains separated by a regional relay zone: the eastern domain is governed by a N-vergent thin-skinned tectonic style above Triassic series and the western domain, by a mixed S-vergent thick- and thin-skinned tectonic style with tectonic inversion of Late Paleozoic-Triassic half grabens. Growth strata indicate that the eastern SVS grew during Danian as a result of shortening transfer from the southern Arc Basin. In contrast, the western SVS is an independent structure which has recorded the early stage (∼83 Ma) of shortening and focused continuous deformation during ∼40 Myr. The shallow N-S shortening is ∼5 km (∼25%) and ∼8 km (∼34%) in the western and eastern SVS, respectively. At a regional scale, the tectonic inversion of the SVS and the Arc Basin recorded a deep shortening of the order of 15-18 km (∼34%). Although the shortening magnitude of the SVS remains small, other structures similar to the SVS were synchronously active across foreland basin, suggesting a significant amount of cumulated shortening. This outer foreland shortening may account for a non-negligible amount of deformation at the Pyrenean-Provence orogen scale.
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https://hal.archives-ouvertes.fr/hal-00812656
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Submitted on : Friday, April 12, 2013 - 3:31:18 PM
Last modification on : Tuesday, December 8, 2020 - 3:45:39 AM

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N. Espurt, J.C. Hippolyte, Marianne Saillard, O. Bellier. Geometry and kinematic evolution of a long-living foreland structure inferred from field data and cross section balancing, the Sainte-Victoire System, Provence, France. Tectonics, American Geophysical Union (AGU), 2012, 31 (TC4021), pp.XX. ⟨10.1029/2011TC002988⟩. ⟨hal-00812656⟩

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