The Warnie volcanic province: Jurassic intraplate volcanism in Central Australia |
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| Institution: | 1. Department of Geology and Petroleum Geology, University of Aberdeen, Aberdeen, AB24 3FX, UK;2. Australian School of Petroleum, University of Adelaide, Adelaide, SA 5005, Australia;3. Vintage Energy, 58 King William Road, Goodwood, SA 5034, Australia;1. Wuhan Center of Geological Survey, China Geological Survey, Wuhan 430205, China;2. State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;3. Department of Earth and Environmental Sciences, University of Windsor, Ontario, Canada;4. State Key Lab of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China;5. Key Laboratory of Marine Hydrocarbon Resources Environmental Geology, Ministry of Natural Resources, Qingdao Institute of Marine Geology, Qingdao 266071, China;6. Key Laboratory of Depositional Mineralization & Sedimentary Minerals, Shandong University of Science and Technology, Qingdao 266590, China;7. School of Earth Sciences, China University of Geosciences Wuhan, Wuhan 430074, China;1. Beijing SHRIMP Center, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;2. School of Earth, Atmospheric and Life Sciences, University of Wollongong, Wollongong, NSW 2522, Australia;1. Departamento de Geología Regional, Instituto de Geología, Universidad Nacional Autónoma de México, 04510 México, DF, Mexico;2. National Taiwan Normal University, Department of Earth Sciences, 88 Tingzhou Road Section 4, Taipei 11677, Taiwan;3. Department of Geology, St. Mary''s University, Halifax, Nova Scotia, Canada B3H 3C3;4. Department of Energy, Halifax, Nova Scotia B3J 3J9, Canada;1. Czech Geological Survey, Klárov 3, Prague, 118 21, Czech Republic;2. Institute of Geology and Paleontology, Faculty of Science, Charles University, Albertov 6, Prague, 128 43, Czech Republic;3. Institute of Geology, The Czech Academy of Sciences, Rozvojová 269, Prague, 165 00, Czech Republic;4. Institute of Geochemistry, Mineralogy and Mineral Resources, Faculty of Science, Charles University, Albertov 6, Prague 128 43, Czech Republic;5. Laboratories of the Geological Institutes, Faculty of Science, Charles University, Albertov 6, Prague, 128 43, Czech Republic;1. Chengdu University of Technology, Chengdu 610059, China;2. Chengdu Center, China Geological Survey, Chengdu 610081, China;3. Land and Resources Department of Tibet Province, Lasa, Tibet 850000, China;4. Geological Team 5 of the Tibet Bureau of Geology and Mineral Exploration and Development, Golmud, Qinghai 816000, China;1. Centre for Tectonics, Resources and Exploration (TRaX), University of Adelaide, Adelaide, SA 5005, Australia;2. Australian School of Petroleum, Centre for Tectonics, Resources and Exploration (TRaX), University of Adelaide, Adelaide, SA 5005, Australia;3. Research School of Earth Sciences, The Australian National University, Canberra 0200, Australia |
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| Abstract: | The Cooper and Eromanga Basins of South Australia and Queensland are the largest onshore hydrocarbon producing region in Australia. Igneous rocks have been documented infrequently within end of well reports over the past 34 years, with a late Triassic to Jurassic age determined from well data. However, the areal extent and nature of these basaltic rocks were largely unclear. Here, we integrate seismic, well, gravity, and magnetic data to clarify the extent and character of igneous rocks preserved within Eromanga Basin stratigraphy overlying the Nappamerri Trough of the Cooper Basin. We recognise mafic monogenetic volcanoes that extend into tabular basalt lava flows, igneous intrusions and, more locally, hydrothermally altered compound lava flows. The volcanic province covers ～7500 km2 and is proposed to have been active between ～180–160 Ma. We term this Jurassic volcanic province the Warnie Volcanic Province (WVP) after the Warnie East 1 exploration well, drilled in 1985. The distribution of extrusive and intrusive igneous rocks is primarily controlled by basement structure, with extrusive and intrusive igneous rocks elongate in a NW-SE direction. Finally, we detail how the WVP fits into the record of Jurassic volcanism in eastern Australia. The WVP is interpreted as a product of extension and intraplate convective upwelling above the subducting Pacific Slab. The discovery of the WVP raises the possibility of other, yet unidentified, volcanic provinces worldwide. |
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