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Formation of Hengchun Accretionary Prism Turbidites and Implications for Deep-water Transport Processes in the Northern South China Sea
投稿时间:2020-05-22  修订日期:2020-11-27  点此下载全文
引用本文:CUI Yuchi,SHAO Lei,YU Mengming,HUANG Chiyue.2021.Formation of Hengchun Accretionary Prism Turbidites and Implications for Deep-water Transport Processes in the Northern South China Sea[J].ACTA GEOLOGICA SINICA(English edition),95(1):55~65
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DOI:10.1111/1755-6724.14640
作者单位E-mail
CUI Yuchi 1 State Key Laboratory of Marine Geology,Tongji University,Shanghai 200092,China2 Earth Dynamics Research Group,The Institute for Geoscience Research (TIGeR), School of Earth and Planetary Sciences,Curtin University,GPO Box U1987,Australia  
SHAO Lei 1 State Key Laboratory of Marine Geology,Tongji University,Shanghai 200092,China lshao@tongji.edu.cn 
YU Mengming 1 State Key Laboratory of Marine Geology,Tongji University,Shanghai 200092,China  
HUANG Chiyue 1 State Key Laboratory of Marine Geology,Tongji University,Shanghai 200092,China  
 
Author NameAffiliationE-mail
CUI Yuchi 1 State Key Laboratory of Marine Geology,Tongji University,Shanghai 200092,China2 Earth Dynamics Research Group,The Institute for Geoscience Research (TIGeR), School of Earth and Planetary Sciences,Curtin University,GPO Box U1987,Australia  
SHAO Lei 1 State Key Laboratory of Marine Geology,Tongji University,Shanghai 200092,China lshao@tongji.edu.cn 
YU Mengming 1 State Key Laboratory of Marine Geology,Tongji University,Shanghai 200092,China  
HUANG Chiyue 1 State Key Laboratory of Marine Geology,Tongji University,Shanghai 200092,China  
Abstract:Located at the end of the northern Manila Trench,the Hengchun Peninsula is the latest exposed part of Taiwan Island,and preserves a complete sequence of accretionary deep-sea turbidite sandstones.Combined with extensive field observations,a ‘source-to-sink’approach was employed to systematically analyze the formation and evolutionary process of the accretionary prism turbidites on the Hengchun Peninsula.Lying at the base of the Hengchun turbidites are abundant mafic normal oceanic crust gravels with a certain degree of roundness.The gravels with U-Pb ages ranging from 25.4 to 23.6 Ma are underlain by hundreds-of-meters thickness of younger deep-sea sandstone turbidites with interbedded gravels.This indicates that large amounts of terrigenous materials from both the‘Kontum-Ying-Qiong’River of Indochina and the Pearl River of South China were transported into the deep-water areas of the northern South China Sea during the late Miocene and further eastward in the form of turbidity currents.The turbidity flow drastically eroded and snatched mafic materials from the normal South China Sea oceanic crust along the way,and subsequently unloaded large bodies of basic gravel-bearing sandstones to form turbidites near the northern Manila Trench.With the Philippine Sea Plate drifting clockwise to the northwest,these turbidite successions eventually migrated and,since the Middle Pleistocene,were exposed as an accretionary prism on the Hengchun Peninsula.
keywords:IODP boreholes,source-to-sink analysis,submarine canyon,turbidite sandstones,Hengchun Peninsula,Taiwan
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