| Geochronology of a surface core in the northern basin of Lake Qinghai： Evidence from ^210pb and ^137Cs radionuclides |
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| 引用本文： | 徐海,艾莉,谭亮成,安芷生. 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, 2006, 25(4): 301-306. DOI: 10.1007/s11631-006-0301-y |
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| 作者姓名： | 徐海 艾莉 谭亮成 安芷生 |
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| 作者单位： | State Key Laboratory of Loess and Quaternary Geology Institute of Earth Environment Chinese Academy of Sciences，State Key Laboratory of Loess and Quaternary Geology Institute of Earth Environment Chinese Academy of Sciences，State Key Laboratory of Loess and Quaternary Geology Institute of Earth Environment Chinese Academy of Sciences，State Key Laboratory of Loess and Quaternary Geology Institute of Earth Environment Chinese Academy of Sciences，Xi'an 710075 China，Xi'an 710075 China，Xi'an 710075 China，Xi'an 710075 China |
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| 基金项目： | 国家重点基础研究发展计划(973计划)，国家自然科学基金 |
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| 摘 要： | 1 Introduction The radionuclides 210Pb and 137Cs are of particularimportance for estimating the dates of recentsediments. It was Goldberg (1963) who firstlysuggested that the disequilibrium between 210Pb and226Ra could serve as a geochronometer applicable…
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| 关 键 词： | 深度沉降率 质量积累率 青海湖 表面核 |
| 收稿时间： | 2009-11-11 |
Geochronology of a surface core in the northern basin of Lake Qinghai: Evidence from 210Pb and 137Cs radionuclides |
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| Hai Xu,Li Ai,Liangcheng Tan,Zhisheng An. Geochronology of a surface core in the northern basin of Lake Qinghai: Evidence from 210Pb and 137Cs radionuclides[J]. Chinese Journal of Geochemistry, 2006, 25(4): 301-306. DOI: 10.1007/s11631-006-0301-y |
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| Authors: | Hai Xu Li Ai Liangcheng Tan Zhisheng An |
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| Affiliation: | (1) State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an, 710075, China |
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| 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. |
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| Keywords: | ~(210)Pb ~(137)Cs depth sedimentation rate mass accumulation rate Lake Qinghai |
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