Full-Text Search:
Home|Journal Papers|About CNKI|User Service|FAQ|Contact Us|中文
《Marine Geology & Quaternary Geology》 2018-05
Add to Favorite Get Latest Update

Geochemical characteristics of surface sediments from the middle deep-sea basin of South China Sea

CAI Guanqiang;LI Shun;ZHAO Li;GAO Hongfang;ZHONG Hexian;KeyLaboratoryofMarine MineralResources,Ministry of Natural Resources,Guangzhou Marine Geological Survey,CGS;  
This paper presents the major and trace elements compositions of the 224 surface sediments taking from the middle deep-sea basin of South China Sea(SCS).Data shows that the samples have low SiO_2and relatively high Fe_2O_3,MgO,CaO,Na_2O,and MnO.The abundances of most trace elements are also higher compared to the upper continental crust.The sediments are composed of four fractions,i.e.the terrigenous silicate fraction,calcareous clastic fraction,pyroclastic fraction and authigenic mineral fraction.The terrigenous silicate and calcareous clastic fractions dominate,while the pyroclastic and authigenic mineral fractions are relatively low in general but significant in some regions.The geochemical characteristics of the surface sediments in the middle deep-sea basin of SCS are mainly controlled by water depth,depositional processes,and sediment sources.The distribution of calcareous clastic fraction is mainly controlled by water depth and deep bottom current transportation.The intensive dissolution of calcium carbonate results in the relatively low content of calcareous clastic fraction in the deep-sea basin deposits,while the terrigenous sediments are supplied to the middle deep-sea basin mainly from the source regions to the west and southwest.The pyroclastic fraction,which is characterized by relatively high content of Na_2O,is possibly derived from the Luzon arc,and mainly deposited in the eastern deep-sea basin and the region to the north of the spreading ridge.
【Fund】: 中国地质调查局项目(1212011220117 DD20160138 DD20160140);; 中国科学院海洋地质与环境重点实验室开放基金(MGE2016KG01)
【CateGory Index】: P736.21
Download(CAJ format) Download(PDF format)
CAJViewer7.0 supports all the CNKI file formats; AdobeReader only supports the PDF format.
©2006 Tsinghua Tongfang Knowledge Network Technology Co., Ltd.(Beijing)(TTKN) All rights reserved