Extensional fault evolution within the Exmouth Sub-basin,North West Shelf,Australia |
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| Institution: | 1. Volcanic Basin Petroleum Research (VBPR), Oslo Science Park, 0349 Oslo, Norway;2. Centre for Earth Evolution and Dynamics (CEED), University of Oslo, 0315 Oslo, Norway;3. Applied Petroleum Technology AS, 0903 Oslo, Norway;4. DougalEARTH Ltd., Solihull B91 3NU, UK;5. Visiting research fellow, Earth, Environmental and Biological Sciences, Queensland University of Technology, Brisbane, QLD 4000, Australia;6. Department of Geology and Petroleum Geology, University of Aberdeen, AB24 3FX, UK;7. ISOR - Iceland Geosurvey, 108 Reykjavik, Iceland;8. TGS, Lensmannslia 4, 1386 Asker, Norway |
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| Abstract: | Structural analysis of the Indian Merge 3D seismic survey identified three populations of normal faults within the Exmouth Sub-basin of the North West Shelf volcanic margin of Australia. They comprise (1) latest-Triassic to Middle Jurassic N-NNE-trending normal faults (Fault Population I); (2) Late Jurassic to Early Cretaceous NE-trending normal faults (Fault Population II); and (3) latest-Triassic to Early Cretaceous N-NNE faults (Fault Population III). Quantitative evaluation of >100 faults demonstrates that fault displacement occurred during two time periods (210–163 and 145–138 Ma) separated by ～20 Myr of tectonic quiescence. Latest Jurassic to Early Cretaceous (145–138 Ma) evolution comprises magmatic addition and contemporaneous domal uplift ～70 km wide characterised by ≥ 900 m of denudation. The areally restricted subcircular uplift centred on the southern edge of the extended continental promontory of the southern Exmouth Sub-basin supports latest Jurassic mantle plume upwelling that initiated progradation of the Barrow Delta. This polyphase and bimodal structural evolution impacts current hydrocarbon exploration rationale by defining the nature of latest Jurassic to Early Cretaceous fault nucleation and reactivation within the southern Exmouth Sub-basin. |
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| Keywords: | Northern Carnarvon Basin Exmouth sub-basin Structural evolution Fault growth |
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