用户名： 密码： 验证码：
10BE Isotope Recordsin Sediment Core Z14-6fromthe Eastern Okinawa Trough Duringthe Last Deglaciationand Holocene
详细信息   
摘要
The 10Be records in sediment Core Z14-6 from the eastern side of the middle Okinawa Trough(27°07’N,127°27’E; water depth: 739m;core length: 8.96m)during the last glacial period and the Holocene are discussed and compared with the 10Be records in sediment Core DGKS9603(28°08.869’N,127° 16.238’E;water depth: 1100m,core length: 585cm)from the North Okinawa Trough. 10Be concentrations in 12 layers in the core section of 2~175cm which covers the chronologic range of 0.37~29.3kaB.P.were determined using Accelerating Mass-Spectrometry(AMS). The average 10Be concentration was 6.10×108 atoms/g,with the maximum 8.71×108atoms/g occurring at 6.3kaB.P.The 10Be concentrations in the last glacial were generally low and also lower than those in DGKS9603.The average sedimentation rate of 10Be in Z14-6 was 1.04×109 atoms/cm2·ka,with the maximum 1.36×109 atoms/cm2·ka occurred at 6.3kaB.P.and minimum 6.45×108 atoms/cm2·ka at 9.27kaB.P.layers,respectively.Due to the shallow water depth,the Kuroshio did not flow through Z14-6 during the last glacial,therefore the average sedimentation rate of 10Be in Z14-6 was at the level of the global mean 10Be atmospheric production rate(1.21×109 atoms/cm2·ka). The decreases of sedimentation rate of 10Be may be related to the low temperature events,among which are Younger Dryas(YD)and Heinrich event H1. 10Be sedimentation rate of Z14-6 significantly decreased at about 3kaB.P.and 9kaB.P.,suggesting large variations of the Kuroshio Current.The peak values of 10Be sedimentation rate of Z14-6 in the Holocene were considerably higher than those during the last glacial period,indicating that the influence of the Kuroshio Current on Z14-6 site had occurred.

© 2004-2018 中国地质图书馆版权所有 京ICP备05064691号 京公网安备11010802017129号

地址：北京市海淀区学院路29号 邮编：100083

电话：办公室：(+86 10)66554848；文献借阅、咨询服务、科技查新：66554700