Supra-salt normal fault growth during the rise and fall of a diapir: Perspectives from 3D seismic reflection data,Norwegian North Sea |
| |
| Institution: | 1. 3D Seismic Lab, School of Earth and Ocean Sciences, Cardiff University, Main Building, Park Place, CF10 3AT Cardiff, United Kingdom;2. Department of Earth Sciences, Olabisi Onabanjo University, Ago-Iwoye, Nigeria;1. Dr. Moses Straus Department of Marine Geosciences, Leon H. Charney School of Marine Sciences, University of Haifa, Haifa, Israel;2. Department of Earth Sciences, University of Geneva, Geneva, Switzerland;3. Department of Geoscience and Petroleum, Norwegian University of Science and Technology, Trondheim, Norway |
| |
| Abstract: | Normal faulting and the deep subsurface flow of salt are key processes controlling the structural development of many salt-bearing sedimentary basins. However, our detailed understanding of the spatial and temporal relationship between normal faulting and salt movement is poor due to a lack of natural examples constraining their geometric and kinematic relationship in three-dimensions. To improve our understanding of these processes, we here use 3D seismic reflection and borehole data from the Egersund Basin, offshore Norway, to determine the structure and growth of a normal fault array formed during the birth, growth and decay of an array of salt structures. We show that the fault array and salt structures developed in response to: (i) Late Triassic-to-Middle Jurassic extension, which involved thick-skinned, sub-salt and thin-skinned supra-salt faulting with the latter driving reactive diapirism; (ii) Early Cretaceous extensional collapse of the walls; and (iii) Jurassic-to-Neogene, active and passive diapirism, which was at least partly coeval with and occurred along-strike from areas of reactive diapirism and wall collapse. Our study supports physical model predictions, showcasing a three-dimensional example of how protracted, multiphase salt diapirism can influence the structure and growth of normal fault arrays. |
| |
| Keywords: | Salt tectonics Active diapirism Reactive diapirism Collapse Fault length establishment |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
