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Volume 18 Issue 2
Apr.  2007
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李前裕, 赵泉鸿, 钟广法, 翦知湣, 田军, 成鑫荣, 汪品先, 陈木宏. Deepwater Ventilation and Stratification in the Neogene South China Sea. Journal of Earth Science, 2007, 18(2).
Citation: 李前裕, 赵泉鸿, 钟广法, 翦知湣, 田军, 成鑫荣, 汪品先, 陈木宏. Deepwater Ventilation and Stratification in the Neogene South China Sea. Journal of Earth Science, 2007, 18(2).

Deepwater Ventilation and Stratification in the Neogene South China Sea

  • Received Date: 2018-07-15
  • Rev Recd Date: 2018-07-15
  • Publish Date: 2018-07-15
  • Combineddataofphysicalproperty,benthicforaminifera,andstableisotopesfromODPSites1148,1146,and1143areusedtodiscussdeepwaterevolutionintheSouthChinaSea(SCS)sincetheEarlyMiocene.Theresultsindicatethat3lithostratigraphicunits,respectivelycorrespondingto21–17Ma,15–10Ma,and10–5Mawithpositiveredparameter(a*)markingtheredbrownsedimentcolorrepresent3periodsofdeepwaterventilation.Thefirst2periodsshowacloserlinktocontemporaryproductionoftheAntarcticBottomWater(AABW)andNorthernComponentWater(NCW),indicatingafreeconnectionofdeepwatersbetweentheSCSandtheopenoceanbefore10Ma.After10Ma,redparameterdroppedbutstayedhigherthanthemodernvalue(a*=0),theCaCO3percentagedifferencebetweenSite1148fromalowerdeepwatersettingandSite1146fromanupperdeepwatersettingenlargedsignificantly,andbenthicspecieswhichpreferoxygen-richbottomconditionsdramaticallydecreased.Coupledwithamajornegativeexcursionofbenthicδ13Cat~10Ma,theseparametersmaydenoteaweakeninginthecontroloftheSCSdeepwaterbytheopenocean.Probablytheymarkthebirthofalocaldeepwaterduetoshallowwaterwaysorriseofsilldepthsduringthecourseofseabasinclosingfromsouthtoeastbythewest-movingPhilippineArcaftertheendofSCSseafloorspreadingat16–15Ma.However,ittookanother5Mabeforethedissolvedoxygenapproachedclosetothemodernlevel.Althoughtheoxygenlevelcontinuedtostabilize,severalPacificBottomWater(PBW)andPacificDeepWater(PDW)markerspeciesrapidlyincreasedsince~6Ma,followedbyadramaticescalationinplanktonicfragmentationwhichindicateshighdissolutionespeciallyafter~5Ma.Theperiodof5–3MasawthestrongeststratifieddeepwaterinthethenSCS,asindicatedbyupto40%CaCO3differencebetweenSites1148and1146.ApartfromastrengtheningPDWasaresultofglobalcoolingandicecapbuilduponnorthernhighlatitudes,adeepeningseabasinduetostrongersubductioneastwardmayalsohavetriggeredtheinfluxofmorecorrosivewatersfromthedeepwesternPacific.Since3Ma,the 
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    沈阳化工大学材料科学与工程学院 沈阳 110142

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Deepwater Ventilation and Stratification in the Neogene South China Sea

Abstract: Combineddataofphysicalproperty,benthicforaminifera,andstableisotopesfromODPSites1148,1146,and1143areusedtodiscussdeepwaterevolutionintheSouthChinaSea(SCS)sincetheEarlyMiocene.Theresultsindicatethat3lithostratigraphicunits,respectivelycorrespondingto21–17Ma,15–10Ma,and10–5Mawithpositiveredparameter(a*)markingtheredbrownsedimentcolorrepresent3periodsofdeepwaterventilation.Thefirst2periodsshowacloserlinktocontemporaryproductionoftheAntarcticBottomWater(AABW)andNorthernComponentWater(NCW),indicatingafreeconnectionofdeepwatersbetweentheSCSandtheopenoceanbefore10Ma.After10Ma,redparameterdroppedbutstayedhigherthanthemodernvalue(a*=0),theCaCO3percentagedifferencebetweenSite1148fromalowerdeepwatersettingandSite1146fromanupperdeepwatersettingenlargedsignificantly,andbenthicspecieswhichpreferoxygen-richbottomconditionsdramaticallydecreased.Coupledwithamajornegativeexcursionofbenthicδ13Cat~10Ma,theseparametersmaydenoteaweakeninginthecontroloftheSCSdeepwaterbytheopenocean.Probablytheymarkthebirthofalocaldeepwaterduetoshallowwaterwaysorriseofsilldepthsduringthecourseofseabasinclosingfromsouthtoeastbythewest-movingPhilippineArcaftertheendofSCSseafloorspreadingat16–15Ma.However,ittookanother5Mabeforethedissolvedoxygenapproachedclosetothemodernlevel.Althoughtheoxygenlevelcontinuedtostabilize,severalPacificBottomWater(PBW)andPacificDeepWater(PDW)markerspeciesrapidlyincreasedsince~6Ma,followedbyadramaticescalationinplanktonicfragmentationwhichindicateshighdissolutionespeciallyafter~5Ma.Theperiodof5–3MasawthestrongeststratifieddeepwaterinthethenSCS,asindicatedbyupto40%CaCO3differencebetweenSites1148and1146.ApartfromastrengtheningPDWasaresultofglobalcoolingandicecapbuilduponnorthernhighlatitudes,adeepeningseabasinduetostrongersubductioneastwardmayalsohavetriggeredtheinfluxofmorecorrosivewatersfromthedeepwesternPacific.Since3Ma,the 

李前裕, 赵泉鸿, 钟广法, 翦知湣, 田军, 成鑫荣, 汪品先, 陈木宏. Deepwater Ventilation and Stratification in the Neogene South China Sea. Journal of Earth Science, 2007, 18(2).
Citation: 李前裕, 赵泉鸿, 钟广法, 翦知湣, 田军, 成鑫荣, 汪品先, 陈木宏. Deepwater Ventilation and Stratification in the Neogene South China Sea. Journal of Earth Science, 2007, 18(2).

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