Edge tectonics (trench rollback,terrane export) of Gondwanaland-Pangea synchronized by supercontinental heat |
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| Institution: | 1. College of Earth Sciences and Guangxi Key Laboratory of Hidden Metallic Ore Deposits Exploration, Guilin University of Technology, Guilin, Guangxi 541004, China;2. State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;3. Geology & Geochemistry Cluster, Department of Earth Sciences, VU Amsterdam, De Boelelaan 1085, 1081 HV Amsterdam, The Netherlands;1. Department of Geological Engineering, Hacettepe University, Beytepe, Ankara, Turkey;2. Department of Geology, University of Patras, Rio, Patras, Greece;3. MTA, General Directorate of Mineral Research and Exploration, Ankara, Turkey;1. V.S. Sobolev Institute of Geology and Mineralogy SB RAS, Koptyuga av. 3, Novosibirsk 630090, Russia;2. Novosibirsk State University, Pirogova st. 2, Novosibirsk 630090, Russia;3. John de Laeter Centre for Isotope Research, Curtin University, GPO Box U 1987, Perth 6845, Western Australia, Australia |
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| Abstract: | From 650–500 Ma assembly, 320 Ma merger in Pangea, to 185 Ma breakup, Gondwanaland developed by the accretion of lithosphere along the convergent edge on the south and by the export of terranes from the divergent edges on the west and northeast. The interior underwent epeirogenic movement except in areas affected during the merger by farfield shortening. Synchronous or near-synchronous events on the edges and interior are linked hypothetically by convection currents in the asthenosphere driven by supercontinent-induced heat. On the convergent edge, currents countered the sinking slab to roll back the trench and generate a backarc basin. On the divergent edge, currents initiated an ocean that prised off continental rims in the form of terranes. In the interior, currents extended the lithosphere in basins and rifts. |
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