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

IOCAS-IR

	Sea-level changes controlled detrital sediment inputs to the Bicol Shelf in the western Philippine Sea since 150 ka
	ZHANG Zhishun ; JIANG Fuqing ; LI Tiegang; YANG Dezhou ; ZHOU Xiaojing ; XIONG Zhifang ; QIU Xiaohua ; JIA Qi; YAN Yu ; FENG Xuguang
发表期刊	Journal of Oceanology and Limnology
ISSN	2096-5508
	2020-07-15
出版年	2020
卷号	v.38 期号:04 页码:258-273
文献类型	CNKI期刊论文
摘要	Detrital sediments derived from the Philippine Islands are one of the main sources of deep-sea sediments in the western Philippine Sea.However,systematic research on their characteristics and transport mechanisms are lacking.We 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 separated.We also measured the Sr and Nd isotopic compositions of different size fractions(<4 and >20 μm) of the detrital sediments and the results showed that the detrital sediments mainly originate from the Philippine Islands.Components 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 stands.The 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 ka.We therefore concluded that the input of coarse detritus to the Bicol Shelf from the islands was mainly controlled by sea-level change.Variations of the input of fine-grained detritus(EM1) was influenced not only by sea level but also by ocean currents and regional precipitation.Overall,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
CNKI专辑号	A;
CNKI专辑名称	基础科学;
CNKI专题号	A010;A011;
CNKI专题名称	海洋学;地质学;
分类号	P736.2
收录类别	中科院核心 ; 中科院扩展
语种	英文;
资助项目(基金）	Supported by the National Natural Science Foundation of China (Nos.41776065,41576050,41830539) ; the Basic Scientific Fund for National Public Research Institutes of China (Nos.2019S04,2017Y07) ; the Strategic Priority Research Program of the Chinese Academy of Sciences(No.XDB42000000) ; the Open Fund of Qingdao National Laboratory for Marine Science and Technology (No.QNLM20160RP0205)
文献类型	CNKI期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/188138
专题	中国科学院海洋研究所
作者单位	1.KeyLaboratoryofMarineGeologyandEnvironment,InstituteofOceanology,ChineseAcademyofSciences 2.CenterforOceanMega-Science,ChineseAcademyofSciences 3.UniversityofChineseAcademyofSciences 4.LaboratoryforMarineGeology,QingdaoNationalLaboratoryforMarineScienceandTechnology 5.KeyLaboratoryofMarineSedimentologyandEnvironmentalGeology,FirstInstituteofOceanography,MinistryofNaturalResources 6.KeyLaboratoryofOceanCirculationandWaves,InstituteofOceanology,ChineseAcademyofScience 7.SchoolofMarineScienceandEnvironment,DalianOceanUniversity 8.No.1InstituteofGeologyandMineralResourcesofShandongProvince 9.SchoolofGeographyandOceanScience,NanjingUniversity
推荐引用方式 GB/T 7714	ZHANG Zhishun,JIANG Fuqing,LI Tiegang,et al. Sea-level changes controlled detrital sediment inputs to the Bicol Shelf in the western Philippine Sea since 150 ka. 2020.