Strontium and neodymium isotopic compositions of detrital sediment of NS90-103 from South China Sea: Variations and their paleoclimate implication  

作　　者：韦刚健 桂训唐 李献华 陈毓蔚 于津生 

机构地区：[1]Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China

出　　处：《Science China Earth Sciences》2000年第6期596-604,共9页中国科学（地球科学英文版）

摘　　要：Strontium, neodymium isotopic compositions and trace elements of the detrital sediments of Core NS90-103 from South China Sea were analyzed. The results show that the87Sr/86Sr ratios of the detritus during the last glacial range from 0.722 4 to 0.723 0. They are significantly higher than those during the Holocene and the maximum of the last interglacial, which range from 0.721 0 to 0.721 7. This indicates stronger continental weathering during the last glacial. On the other hand, the143Nd/144Nd ratios of these detritus are higher during the last glacial too, similar to the variation of the87Sr/86Sr ratios. The trace element geochemistry of these detritus indicates that more authigenic sediments, such as ferromanganese, during the last glacial may partly contribute to the increase of143Nd/144Nd ratios. Furthermore, much more detritus from continent of South China to the north of the South China Sea may probably contribute to143Nd/144Nd ratios increase during the last glacial, which was the result of the enhancement of northeast monsoon.Strontium, neodymium isotopic compositions and trace elements of the detrital sediments of Core NS90-103 from South China Sea were analyzed. The results show that the 87Sr/86Sr ratios of the detritus during the last glacial range from 0.722 4 to 0.723 0. They are significantly higher than those during the Holocene and the maximum of the last interglacial, which range from 0.721 0 to 0.721 7. This indicates stronger continental weathering during the last glacial. On the other hand, the 143Nd/144Nd ratios of these detritus are higher during the last glacial too, similar to the variation of the 87Sr/86Sr ratios. The trace element geochemistry of these detritus indicates that more authigenic sediments, such as ferromanganese, during the last glacial may partly contribute to the increase of 143Nd/144Nd ratios. Furthermore, much more detritus from continent of South China to the north of the South China Sea may probably contribute to 143Nd/144Nd ratios increase during the last glacial, which was the result

关 键 词：Nansha ISLANDS DETRITAL sediments STRONTIUM and NEODYMIUM ISOTOPES paleoclimate. 

分 类 号：P597[天文地球—地球化学]