The elemental carbon record in Weinan loess section since the last 21 ka  

作　　者：YANG Ying SHEN Chengde YI Weixi SUN Yanmin LIU Dongsheng 

机构地区：[1]Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640,China [2]Xi’an State Key Laboratory of Loess and Quaternary Geology,Chinese Academy of Sciences,Xi’an 710061,China [3]Institute of Geology and Geophysics Chinese Academy of Sciences,Beijing 100029,China

出　　处：《Chinese Science Bulletin》2001年第18期1541-1544,共4页

基　　金：This work was supported by the National Natural Science Foundation of China (Grant No. 49773186); the National Key Basic Research Project (Grant No. G1999043401); the Natural Resources and Environment Program, the CAS (Grant Nos. KZ951-A1-402-08-01 and

摘　　要：We studied the records of elemental carbon (EC) of the last 21 ka in the Weinan loess section, Shanxi Province. The variations of EC abundance and δ13CEC value along with depth (or age) were presented. There are four large peaks of EC abundance around the following years: 20.16 ka, 17.76 ka, 11.97 ka and 4.49 ka. Climatic situation was changed rapidly during these periods. The peaks around 11.97 ka and 20.16 ka are particularly sharp, occurring over intervals of tens to hundreds of years, which could represent short-duration intense events. δ13CEc values in the upper 4 m of the Weinan loess section vary between -11.71‰ and -21.34‰, which suggests that the vegetation pattern of the last 21 ka on the Loess Plateau is G4-dominated grasses.We studied the records of elemental carbon (EC) of the last 21 ka in the Weinan loess section, Shanxi Province. The variations of EC abundance and δ13CEC value along with depth (or age) were presented. There are four large peaks of EC abundance around the following years: 20.16 ka, 17.76 ka, 11.97 ka and 4.49 ka. Climatic situation was changed rapidly during these periods. The peaks around 11.97 ka and 20.16 ka are particularly sharp, occurring over intervals of tens to hundreds of years, which could represent short-duration intense events. δ13CEC values in the upper 4 m of the Weinan loess section vary between ?11.71‰ and ?21.34‰, which suggests that the vegetation pattern of the last 21 ka on the Loess Plateau is C4-dominated grasses.

关 键 词：ELEMENTAL carbon fire history Weinan LOESS SECTION δ13C paleoenvironment. 

分 类 号：P595[天文地球—地球化学]