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Cholerny Spammer
Joined: 03 Nov 2010
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Location: England
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 Posted: Wed 5:50, 16 Feb 2011 Post subject: uggs ireland East Pacific Rise hydrothermal geoche |
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East Pacific Rise hydrothermal geochemistry of sediment cores
lowerparts, thecontentsofFeandMndecrease,[link widoczny dla zalogowanych], whilethecontentofAlincreasesdistinctly, withlittleornohydrothermalsignature. Asthedistanceetweenthetwocoresandtheridgeaxisortheventsarediffrent,[link widoczny dla zalogowanych], thehydrothermalsignaturespreservedinthetwocoreehavedifferently. ThecommoncharacteristicofthetwocoresiSthatCaandSrinbothcoresarenegativelyorslightlytxxsitivelycorrelatedwithotherelements. Carbon-14agesofsedimentsfromdifferentlayeretween35 - 250crnbelowtheseafloorinCoreB13-26showsalimitedrangefrom10500to12000yearsBP. withthedif an article by the National Key Basic Research Program First author: Xue Fayu, female, born in 1977, Ph.D., marine geochemistry direction; E-mail: xuefayu @ sina. corn. Supplement Xuefa Yu et al: Liquid active region East Pacific Rise Geochemistry of sediment cores 201ferenceofonlyseveralhundredyears, evenlowerthantheerrors. Combinedwiththedistributionpatternsoftypicalhydrothermalcomponentsalongthecore, itisheldthatthesedimentsinCoreB13-26haverecordedanintensehydrothermaleventwithahighsedi-mentationrate. Thiseventshouldhavestartedfrom12000yrBPandweakenedalittle10000yrBP. Carbon a 14ageoftheforaminiferinthesedimentsat45 ~ 50eIrtbelowtheseafloorfromCoreB13-62iS32900 �� 530yearsBP. Owingtothelimitationofthisdatingmethod, theageofsedimentsat135 ~ 140cmbelowtheseafloorwasnotacquired. Itshouldbeolderthan40000yearsBP. Obviously, CoreB13-62Wasnotaffectedbythehydrothermalactivitiesattheearlyperiod, andwithalowsedimentationrate. Onlyrecently,[link widoczny dla zalogowanych], intheupper0 - 35cin, thesedimentswereaffectedbyhyarothermalactivities, resultingintheenrichmentofFe,[link widoczny dla zalogowanych], Mn, Zn, Cr, Co, N /, V,[link widoczny dla zalogowanych], etc. KeywordshyarothermalactivitysedimentcoresgeochemistryCarbon a 14agesEastPacificRise
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