Structural style in a young flexure-induced oblique extensional system,north-western Bonaparte Basin,Australia |
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| Institution: | 1. Department of Earth Science, University of Toronto, 22 Russell Street, Toronto, ON M5S 3B1, Canada;2. AEL-AMS Laboratory, Advanced Research Complex, University of Ottawa, 25 Templeton St., Ottawa, ON K1N 6N5, Canada;1. Department of Geological and Environmental Sciences, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel;2. Geological Survey of Israel, 30 Malkhe Israel Street, Jerusalem 95501, Israel;1. Limnological Institute, Siberian Branch of the Russian Academy of Sciences, Ulan-Batorskaya Street 3, Irkutsk, 664033, Russia;2. V.B. Sochava Institute of Geography SB RAS, Ulan-Batorskaya Street 1, Irkutsk, 664033, Russia;3. Renard Centre of Marine Geology (RCMG), Universiteit Gent, Belgium;4. Royal Belgian Institute of Natural Sciences, Operational Directorate Natural Environment (RBINS, OD Nature), Ostend, Belgium;5. Environmental and Energy Resources Research Center, Kitami Institute of Technology, Kitami, Japan;1. Dipartimento di Scienze della Terra, Università di Napoli Federico II, Naples, Italy;2. Dipartimento di Scienze della Terra e dell''Ambiente, Università di Pavia, Via Ferrata, 1, Pavia, Italy;1. CAS Key Laboratory of Marginal Sea Geology, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou City, 510640, China;2. State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou City, 510640, China |
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| Abstract: | In the north-western Bonaparte Basin (North West Shelf of Australia) Neogene to Recent flexure-induced extension superimposed obliquely over the Mesozoic rift structures. Thus, the area offers a good opportunity to investigate the dynamics and architecture of oblique extension fault systems. Analysis of basin-scale 2D and 3D seismic data along the Vulcan sub-basin shows that Neogene deformation produced a new set of extensional, en échelon faults, at places accompanied by the reactivation of the Mesozoic faults. The pre-existing Mesozoic structures strongly control the distribution of the Neogene-Recent deformation, both at regional and local scales. Main controls on the Neogene-Recent fault style, density and segmentation/linkage include: (1) the orientation of the underlying Mesozoic structures, (2) the obliqueness of the younger extension relative to the rift-inherited faults, and (3) the proximity to the Timor Trough. Three types of vertical relationships have been observed between Mesozoic and Neogene-Recent faults. Hard linkages seems to develop when both fault systems trend parallel, therefore increasing risks for trap integrity. It is suggested that the orientation of maximum horizontal stress (SHmax) relative to the Mesozoic faults, forming hydrocarbon traps, is critical for their potential seal/leak behaviour. Stratigraphic growth across the faults indicates that main fault activity occurred during the Plio-Pleistocene, which corresponds to the timing of tectonic loading on Timor Island and the development of lithospheric flexure. Synchronism of normal faulting with flexural bending suggests that extensional deformation on the descending Australian margin accompanied the formation of the Timor Trough. |
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| Keywords: | Flexure Oblique extension En échelon faulting 3D seismic megasurvey Fault linkages |
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