Advanced Search

Indexed by SCI、CA、РЖ、PA、CSA、ZR、etc .

Volume 19 Issue 1
Feb.  2008
Article Contents
Turn off MathJax

Citation:

Characteristics of Clay Minerals in the Northern South China Sea and Its Implications for Evolution of East Asian Monsoon since Miocene

  • Received Date: 2018-07-15
  • Claymineralassemblages,crystallinity,chemistry,andmicromorphologyofclayparticlesinsedimentsfromODPSite1146inthenorthernSouthChinaSea(SCS)wereanalyzed,andusedtotracesedimentsourcesandobtainproxyrecordsofthepastchangesintheEastAsianmonsoonclimatesincetheMiocene,basedonamulti-approach,includingX-raydiffraction(XRD)andscanningelectronmicroscopycombinedwithenergydispersiveX-rayspectrometry(SEM-EDS).Claymineralsconsistmainlyofilliteandsmectite,withassociatedchloriteandkaolinite.TheilliteatODPSite1146hasverywell-to-wellcrystallinity,andsmectitehasmoderate-to-poorcrystallinity.InSEMthesmectiteparticlesatODPSite1146oftenappearcauliflower-like,atypicalmicromorphologyofvolcanicsmecites.ThesmectiteatODPSite1146isrelativelyrichinSielement,butpoorinFe,verysimilartothesmectitefromtheWestPhilippineSea.Incontrast,thechemicalcompositionofilliteatODPSite1146hasnoobviousdifferencesfromthoseoftheLoessplateau,YellowRiver,YangtzeRiver,andPearlRiver.AfurtherstudyonsedimentsourceindicatesthatsmectiteoriginatesmainlyfromLuzon,kaolinitefromthePearlRiver,andilliteandchloritefromthePearlRiver,Taiwanand/ortheYangtzeRiver.TheclaymineralassemblagesatODPSite1146werenotonlycontrolledbycontinentaleatheringregimessurroundingtheSCS,butalsobythechangingstrengthofthetransportprocesses.Theratiosof(illite+chlorite)/smectiteatODPSite1146wereadoptedasproxiesfortheEastAsianmonsoonevolution.Relativelyhigherratiosreflectstronglyintensifiedwintermonsoonrelativeto summermonsoon,incontrast,lowerratiosindicateastrengthenedsummermonsoonrelativetowintermonsoon.TheconsistentvariationofthisclayproxyfromthoseofLoessplateau,eoliandepositionintheNorthPacific,planktonic,benthicforaminifera,andblackcarbonintheSCSsince20MashowsthatthreeprofoundshiftsoftheEastAsianwintermonsoonintensity,andaridityintheAsianinlandandtheintensityofwintermonsoonrelativetosummermonsoon,occurredatabout15Ma,8Ma,andtheyoungeratabout3Ma.Thephaseduplift&nb
  • 加载中
  • 加载中
通讯作者: 陈斌, bchen63@163.com
  • 1. 

    沈阳化工大学材料科学与工程学院 沈阳 110142

  1. 本站搜索
  2. 百度学术搜索
  3. 万方数据库搜索
  4. CNKI搜索

Article Metrics

Article views(866) PDF downloads(24) Cited by()

Related
Proportional views

Characteristics of Clay Minerals in the Northern South China Sea and Its Implications for Evolution of East Asian Monsoon since Miocene

  • 1. Key Laboratory of Marine Geology and Environmen

Abstract: Claymineralassemblages,crystallinity,chemistry,andmicromorphologyofclayparticlesinsedimentsfromODPSite1146inthenorthernSouthChinaSea(SCS)wereanalyzed,andusedtotracesedimentsourcesandobtainproxyrecordsofthepastchangesintheEastAsianmonsoonclimatesincetheMiocene,basedonamulti-approach,includingX-raydiffraction(XRD)andscanningelectronmicroscopycombinedwithenergydispersiveX-rayspectrometry(SEM-EDS).Claymineralsconsistmainlyofilliteandsmectite,withassociatedchloriteandkaolinite.TheilliteatODPSite1146hasverywell-to-wellcrystallinity,andsmectitehasmoderate-to-poorcrystallinity.InSEMthesmectiteparticlesatODPSite1146oftenappearcauliflower-like,atypicalmicromorphologyofvolcanicsmecites.ThesmectiteatODPSite1146isrelativelyrichinSielement,butpoorinFe,verysimilartothesmectitefromtheWestPhilippineSea.Incontrast,thechemicalcompositionofilliteatODPSite1146hasnoobviousdifferencesfromthoseoftheLoessplateau,YellowRiver,YangtzeRiver,andPearlRiver.AfurtherstudyonsedimentsourceindicatesthatsmectiteoriginatesmainlyfromLuzon,kaolinitefromthePearlRiver,andilliteandchloritefromthePearlRiver,Taiwanand/ortheYangtzeRiver.TheclaymineralassemblagesatODPSite1146werenotonlycontrolledbycontinentaleatheringregimessurroundingtheSCS,butalsobythechangingstrengthofthetransportprocesses.Theratiosof(illite+chlorite)/smectiteatODPSite1146wereadoptedasproxiesfortheEastAsianmonsoonevolution.Relativelyhigherratiosreflectstronglyintensifiedwintermonsoonrelativeto summermonsoon,incontrast,lowerratiosindicateastrengthenedsummermonsoonrelativetowintermonsoon.TheconsistentvariationofthisclayproxyfromthoseofLoessplateau,eoliandepositionintheNorthPacific,planktonic,benthicforaminifera,andblackcarbonintheSCSsince20MashowsthatthreeprofoundshiftsoftheEastAsianwintermonsoonintensity,andaridityintheAsianinlandandtheintensityofwintermonsoonrelativetosummermonsoon,occurredatabout15Ma,8Ma,andtheyoungeratabout3Ma.Thephaseduplift&nb

Catalog

    /

    DownLoad:  Full-Size Img  PowerPoint
    Return
    Return