Effect of dead carbon on the^(14)C dating of the speleothem  

作　　者：CAIYanjun WarrenBeck ZHANGZhaofeng 

机构地区：[1]StateKeyLaboratoryofLoessandQuaternaryGeology,InstituteofEarthEnvironment,ChineseAcademyofSciences,Xi'an710075,China [2]UniversityofArizona,Tucson,AZ85721,USA [4]DepartmentofEarthandSpaceSciences,UniversityofScienceandTechnologyofChina,Hefei230026,China//UniversityofIllinois-UrbanaChampaign,Champaign,IL61801,USA

出　　处：《Chinese Science Bulletin》2005年第8期817-821,共5页

基　　金：supported by the Chinese Academy of Sciences(Grant Nos.KZCX2-SW-118 and KZCX3-SW-120);the National Basic Research Program of China(Grant No.G1 999043401).

摘　　要：Based on the comparison of dating results among high-precision TIMS U-series and AMS 14C as well as the published 14C dating results and their band counting ages (i.e. calendar ages), this paper discusses the effect of dead carbon on the speleothem 14C dating. The result shows that the fraction of incorporated dead carbon during the forma- tion of speleothem varies. The change in the fraction of dead carbon would result in big deviation in the 14C age of the speleothem. It is indispensable to take the dead carbon into consideration when dating the speleothem using the 14C method or studying the atmospheric 14C concentration dur- ing the past with the speleothem.Based on the comparison of dating results among high-precision TIMS U-seriesand AMS ^(14)C as well as the published ^(14)C dating results and their band counting ages (i.e.calendar ages), this paper discusses the effect of dead carbon on the speleothem ^(14)C dating. Theresult shows that the fraction of incorporated dead carbon during the formation of speleothemvaries. The change in the fraction of dead carbon would result in big deviation in the ^(14)C age ofthe speleothem. It is indispensable to take the dead carbon into consideration when dating thespeleothem using the ^(14)C method or studying the atmospheric ^(14)C concentration during the pastwith the speleothem.

关 键 词：洞穴堆积物 钟乳石 “死碳” 岩石年龄 测定方法 

分 类 号：P585[天文地球—岩石学]