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Weld kinematics of syn-rift salt during basement-involved extension and subsequent inversion : results from analog models
Roma, M. (Universitat de Barcelona. Departament de Dinàmica de la Terra i de l'Oceà)
Ferer, O, (Universitat de Barcelona. Departament de Dinàmica de la Terra i de l'Oceà)
McClay, K.R. (Fault Dynamics Research Group, Earth Sciences Department)
Muñoz, Josep Antón (Universitat de Barcelona. Departament de Dinàmica de la Terra i de l'Oceà)
Roca i Abella, Eduard (Universitat de Barcelona. Departament de Dinàmica de la Terra i de l'Oceà)
Gratacós, O. (Universitat de Barcelona. Departament de Dinàmica de la Terra i de l'Oceà)
Cabello López, Patricia (Universitat de Barcelona. Departament de Dinàmica de la Terra i de l'Oceà)

Fecha: 2018
Resumen: Scaled analog models based on extensional basins with synrift salt show how basement topography exerts a control factor on weld kinematics during the extension and inversion phases. In the case of basement-involved extension, syn-rift salt thickness differences may lead to variable degrees of extensional decoupling between basement topography and overburden, which in turn have a strong impact on the development of salt structures. With ongoing extension and after welding, the basin kinematics evolves toward a coupled deformation style. The basin architecture of our experimental results record the halokinetic activity related to growing diapirs and the timing of weld formationduring extension. Moreover, the structures that result from anysubsequent inversion of these basins strongly depends on the inherited welds and salt structures. While those basins are uplifted,the main contractional deformation during inversion is absorbed by the pre-existing salt structures, whose are squeezed developing secondary welds that often evolve into thrust welds. The analysis of our analog models shows that shortening of diapirs is favored by: i) basement topography changes that induce reactivation of primary welds as thrust welds; ii) reactivation of the salt unit as a contractional detachment and iii) synkinematic sedimentation during basin inversion. Finally, in this article, we also compare two natural examples from the southern North Sea that highlight deformation patterns very similar to those observed in our analog models.
Derechos: Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original. Creative Commons
Lengua: Anglès.
Documento: article ; recerca ; publishedVersion
Materia: Extension and inversion ; Salt tectonics ; Syn-rift salt ; Analog modeling ; Southern North Sea
Publicado en: Geologica acta, Vol. 16 Núm. 4 (December 2018) , p. 391-410 (Articles) , ISSN 1696-5728

Adreça alternativa: https://www.raco.cat/index.php/GeologicaActa/article/view/347814
DOI: 10.1344/GeologicaActa2018.16.4.4


20 p, 15.8 MB

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