首页|期刊导航|中国地球化学学报（英文版）|Geochronology of a surface core in the northern basin of Lake Qinghai: Evidence from 210Pb and 137Cs radionuclides
中国地球化学学报（英文版）2006，Vol.25Issue(4)：301-306,6.
Geochronology of a surface core in the northern basin of Lake Qinghai: Evidence from 210Pb and 137Cs radionuclides
Geochronology of a surface core in the northern basin of Lake Qinghai: Evidence from 210Pb and 137Cs radionuclides
摘要
Abstract
The radioactivities of 210Pb and 137Cs have been measured to estimate the dates of the sediments of a surface core (QH0407-C-2) in the northern basin of Lake Qinghai. The sedimentation rate derived from 210Pb radioactivity correlates well with that inferred from 137Cs radioactivity. The dates calculated from depth sedimentation rate (cm/a) are similar to those derived from mass accumulation rate (g·cm-2·a-1) between 0-5 cm, but are significantly different below 5 cm, which has been ascribed to the compaction of surface sediments during early diagenesis. The dates derived from mass accumulation rate are consistent with those calculated from the AMS 14C dating model. The precipitation-controlled indices based on the chronology data derived from mass accumulation rate are similar in trends to the precipitation reconstructed from tree rings in adjacent region, which further verifies the reliability of the geochronology data.关键词
210Pb/137Cs/depth sedimentation rate/mass accumulation rate/Lake QinghaiKey words
210Pb/137Cs/depth sedimentation rate/mass accumulation rate/Lake Qinghai分类
天文与地球科学引用本文复制引用
XU Hai,AI Li,TAN Liangcheng,AN Zhisheng..Geochronology of a surface core in the northern basin of Lake Qinghai: Evidence from 210Pb and 137Cs radionuclides[J].中国地球化学学报（英文版）,2006,25(4):301-306,6.基金项目
This work is supported by the National Basic Research Program of China (No.2004CB720207), and by the National Natural Science Foundation of China (No.40599422). （No.2004CB720207）
