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Sea-level changes controlled detrital sediment inputs to the bicol shelf in the western Philippine Sea since 150 ka

Journal of Oceanology and Limnology 2020年第4期38卷 1153-1168页

作者： ZHANG Zhishun JIANG Fuqing LI Tiegang YANG Dezhou ZHOU Xiaojing XIONG Zhifang QIU Xiaohua JIA Qi YAN Yu FENG Xuguang Key Laboratory of Marine Geology and Environment Institute of OceanologyChinese Academy of SciencesQingdao 266071China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China University of Chinese Academy of Sciences Beijing 100049China Laboratory for Marine Geology Qingdao National Laboratory for Marine Science and TechnologyQingdao 266237China Key Laboratory of Marine Sedimentology and Environmental Geology First Institute of OceanographyMinistry of Natural ResourcesQingdao 266061China Key Laboratory of Ocean Circulation and Waves Institute of OceanologyChinese Academy of ScienceQingdao 266071China School of Marine Science and Environment Dalian Ocean UniversityDalian 116023China No.1 Institute of Geology and Mineral Resources of Shandong Province Jinan 250014China School of Geography and Ocean Science Nanjing UniversityNanjing 210023China

Detrital sediments derived from the Philippine Islands are one of the main sources of deep-sea sediments in the western Philippine ***,systematic research on their characteristics and transport mechanisms are *** used parametric end-member analysis to quantitatively partition the grain size of detrital sediments in core MD06-3052 from the bicol shelf in the western Philippine Sea;three endmembers EMI,EM2,and EM3,whose respective modes were at 2,10,and 45 μm,were *** also measured the Sr and Nd isotopic compositions of different size fractions(20 μm) of the detrital sediments and the results showed that the detrital sediments mainly originate from the Philippine *** EMI and EM2 are transported to the bicol shelf mainly by surface and bottom currents from the islands,and component EM3 is delivered by gravity flow from the exposed shelf during low sea-level *** content of the total detrital fraction and the three end-members,as well as the mass accumulation rates(MARs) of the coarse detritus(EM2 and EM3),were considerably higher during glacial periods(40-14 ka and 150-130 ka) than during other intervals;the glacials corresponded to a low sea level,while the MAR of the fine detritus(EMI) did not increase remarkably during 40-14 *** therefore concluded that the input of coarse detritus to the bicol shelf from the islands was mainly controlled by sea-level *** of the input of fine-grained detritus(EM1) was influenced not only by sea level but also by ocean currents and regional ***,our results help understand "source-to-sink" processes in the western Pacific marginal seas and their response to global change.

关键词： bicol shelf late Pleistocene grain size sea level change

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