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Causes of Cretaceous subduction termination below South China and Borneo:Was the Proto-South China Sea underlain by an oceanic plateau?

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Geoscience Frontiers 2024年第2期15卷 100-124页

作者： Suzanna H.A.van de lagemaat licheng Cao Junaidi Asis eldert l.advokaat Paul R.D.Mason Mark J.Dekkers Douwe J.J.van Hinsbergen Department of Earth Sciences Utrecht UniversityUtrechtthe Netherlands College of Marine Science and Technology China University of GeosciencesWuhanChina Faculty of Science and Natural Resources Universiti Malaysia SabahKota KinabaluMalaysia

The South China,Indochina,and Borneo margins surrounding the South China Sea contain long-lived arcs that became inactive at approximately 85 Ma,even though an embayment of oceanic crust(the‘Proto-South China Sea’)remained in the intervening *** oceanic crust eventually subducted in the Cenozoic below Borneo and the Cagayan arc,while the modern South China Sea opened in its *** investigate the enigmatic cessation of Mesozoic subduction below South China and Borneo,we studied a fragment of oceanic crust and overlying trench-fill sediments that accreted to NW Borneo during the final stages of Paleo-Pacific *** on radiolarian biostratigraphy of cherts overlying the pillow basalts and detrital zircon geochronology of the trench-fill,we constrained the minimum age of the oceanic crust during accretion to 40 *** shows that subduction cessation was not related to ridge *** analysis of pillow basalts revealed an enriched mid-ocean ridge basalt signature comparable to oceanic *** paleomagnetism,we show that this fragment of oceanic crust was not part of the Izanagi Plate but was part of a plate(the‘Pontus’Plate)separated from the Izanagi Plate by a subduction *** on the minimum 40 Ma age of the oceanic crust and its geochemistry,we suggest that Mesozoic subduction below South China and Borneo stopped when an oceanic plateau entered the trench,while the eastern plate margin with the Izanagi Plate remained *** show how our findings offer opportunities to restore plate configurations of the Panthalassa-Tethys junction region.

关键词： Proto-South China Sea Paleomagnetism Geochemistry Borneo Paleo-Pacific Izanagi Plate

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