Late Jurassic intraplate faulting in eastern Australia: A link to subduction in eastern Gondwana and plate tectonic reorganisation |
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| Institution: | 1. BHP, Brisbane, QLD 4000, Australia;2. CSIRO Energy, Kensington, WA 6152, Australia;3. School of Earth and Environmental Sciences, The University of Queensland, Brisbane, QLD 4072, 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. State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Science and Resources, China University of Geosciences, Beijing 100083, China;2. CAS Center for Excellence in Tibetan Plateau Earth Sciences, Beijing 100101, China;3. School of Earth Sciences, Chengdu University of Technology, Chengdu 610059, China;4. Chengdu Institute of Geology and Mineral Resources, Chengdu 610082, China;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. School of Earth and Environmental Sciences, The University of Queensland, Brisbane, QLD 4072, Australia;2. School of Earth, Environmental and Biological Sciences, Queensland University of Technology, Brisbane, QLD 4001, Australia;3. Institut des Sciences Exactes et Appliquées, University of New Caledonia, BP R4, 98851 Noumea, New Caledonia;4. Service Géologique de Nouvelle-Calédonie, BP 465, 98 845 Noumea, New Caledonia |
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| Abstract: | Eastern Gondwana was subjected to subduction processes during the Middle-Late Jurassic, but how these processes affected intraplate deformation in eastern Australia is poorly understood. Here we present 40Ar/39Ar, K-Ar, and Rb-Sr geochronological data from illitic clay-bearing fault gouges associated with the northern part of the 200 km long, N-striking, dextral strike-slip, Demon Fault in eastern Australia. We show a major range of geochronological ages at 162.99 ± 0.74–152.1 ± 4.8 Ma, indicating that the Demon Fault was active during the Late Jurassic. This period partially coincides with the Middle-Late Jurassic deposition of widespread ash-fall tuffs in the Clarence-Moreton, Surat, and Eromanga basins. We propose that Middle-Late Jurassic intraplate tectonism in eastern Australia was influenced by subduction processes farther east, which produced extensive calc-alkaline magmatism in New Zealand from ~170 Ma. A global plate reorganisation event, related to the development of Early-Middle Jurassic sea-floor spreading of the Pacific Plate, possibly acted as the driving mechanism responsible for the intensification of magmatism and intraplate faulting in eastern Gondwana. |
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