Structural evolution of a salt-cored,domed, reactivated fault complex,Jebel Madar,Oman |
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| Affiliation: | 1. Bureau of Economic Geology, Jackson School of Geosciences, The University of Texas at Austin, University Station, Box X, Austin, TX 78713-8924, USA;2. Basins Research Group (BRG), Department of Earth Science and Engineering, Imperial College, Prince Consort Road, London SW7 2BP, UK;1. Department of Geology, Faculty of Earth Sciences, Shahid Beheshti University, Tehran, Iran;2. National Iranian Oil Company, Exploration Directorate, Tehran, Iran;3. Research Institute for Earth Sciences, Geological Survey of Iran, Tehran, Iran;1. Group of Dynamics of the Lithosphere (GDL), Institute of Earth Sciences Jaume Almera, ICTJA-CSIC, Lluís Solé i Sabarís s/n, 08028 Barcelona, Spain;2. Géosciences Rennes, UMR CNRS 6118, Université de Rennes 1, OSUR, Campus de Beaulieu, 263 Avenue Leclerc, 35042 Rennes Cedex, France;3. Departament de Mineralogia, Petrologia i Geologia Aplicada, Universitat de Barcelona, Martí i Franquès s/n, 08028 Barcelona, Spain;4. Statoil Research Centre, Bergen, Norway;1. Postgraduate Program in Geodynamics and Geophysics, Federal University of Rio Grande do Norte, Brazil;2. Department of Geology, Federal University of Rio Grande do Norte, Brazil;3. Department of Earth Science, University of Bergen, Bergen, Norway |
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| Abstract: | Fault and fracture patterns associated with domal structures are observed around the world both at outcrop and in the subsurface. However, the structural evolution of domes and the influence of previous fault and fracture sets are not yet fully understood. This study provides the first structural evolution analysis of Jebel Madar, a domal outcrop in the Adam Foothills of Northern Oman, and evaluates the role of multiple local tectonic events and the associated salt diapirism on fracture and fault distribution pattern development of a salt-cored domal outcrop.Analyses at Jebel Madar suggest that three local tectonic events with different stress regimes that are tentatively linked to three regional tectonic events resulted in a salt-cored, domed, reactivated fault complex: 1) initial dome-formation and NE–SW oriented mode 1 opening fractures and subsequent grabens; 2) E–W oriented dextral strike-slip faulting; and 3) reactivation and inversion of faults, and final dome formation. Salt emplacement is associated with the first and last tectonic events.This integrated study highlights the complicated evolution of fault and fracture distribution patterns at a salt-cored dome. Caution is therefore required in interpretation of similar structural patterns on top of and around salt-cored domes. |
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| Keywords: | Salt-cored dome Structural evolution Fault and fracture distribution pattern Jebel Madar Oman |
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