| 中国新疆博斯腾湖全新世沉积环境年代学特征 |
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| 引用本文： | 张成君,曹洁,类延斌,尚华明.中国新疆博斯腾湖全新世沉积环境年代学特征[J].沉积学报,2004,22(3):494-499. |
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| 作者姓名： | 张成君 曹洁 类延斌 尚华明 |
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| 作者单位： | 兰州大学资源环境学院 兰州 730000 |
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| 基金项目： | 国家重点基础研究规划项目“中国西部干旱区生态环境演变与调控研究”(批准号 :G1 9990 4 350 1 )，国家自然科学基金项目 (批准号 :40 0 4 1 0 0 4 )资助 |
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| 摘 要： | 通过对博斯腾湖沉积物湖芯样品进行137Cs,14C-AMS测年分析,湖芯剖面上有明显的1986年的切尔诺贝利核事故蓄积峰,以及1975年和1963年次蓄积峰,这些137Cs蓄积峰对博斯腾湖现代沉积有明显的时标意义。通过质量深度与年代分析,博斯腾湖的沉积速率相对稳定,平均沉积速率为0.13±0.01g/cm2.a。与14C年代获得的中全新世以来的平均沉积速率0.13±0.03cm/a和0.12±0.05cm/a相似,表明博斯腾湖中全新世以来的沉积环境较稳定,并且也说明14C-AMS测年分析所得的结果较为可靠,可以利用博斯腾湖沉积物样品测定的14C年代进行线性回归作年代校正,由于湖泊沉积物中老碳效应的影响,博斯腾湖沉积物有机质14C测年偏老约650a左右。
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| 关 键 词： | 博斯腾湖 137Cs计年 沉积速率 14CAMS年代 |
| 文章编号： | 1000-0550(2004)03-0494-06 |
| 收稿时间： | 2003-10-16 |
| 修稿时间： | 2003年10月16日 |
The Chronological Characteristics of Bosten Lake Holocene Sediment Environment in Xinjiang, China |
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| ZHANG Cheng-junCAO Jie,LEI Yan-binSHANG Hua-ming.The Chronological Characteristics of Bosten Lake Holocene Sediment Environment in Xinjiang, China[J].Acta Sedimentologica Sinica,2004,22(3):494-499. |
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| Authors: | ZHANG Cheng-junCAO Jie LEI Yan-binSHANG Hua-ming |
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| Institution: | School of Resources and Environmental Sciences, Lanzhou University, Lanzhou 730000 |
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| Abstract: | Cs and 14C AMS were analyzed for the Bosten Lake sediment cores in Xinjiang, arid China. In the BST-4 core 137 Cs section, there are obvious 1986 Chemobyl nucleus accident peak and 1975, 1963 peaks, which are important age characteristics for the Bosten lake sediment. The sedimentation rate, which was average 0.13±0.01 g/cm 2 .a, was stable in the Bosten Lake by analysing the mass depth and ages. It is very similar to that from the 14C age, 0.13±0.03cm/a for BSTC-1 core and 0.12±0.05cm/a for xb46 core, in Bosten Lake after middle Holocene and show that the depositional environment was stable and the 14C ages were accurate. From the 14C age of the samples in Bosten Lake, it can be calibrated the old carbon effect produced by the hard water in the lakes and old carbon effect can lead to the old age for the 14C age in analysing the lake organic matters in sediments. We obtained the result of about 650a old effect in Bosten lake from the 14C age and the sedimentation rate by the 137 Cs data. |
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| Keywords: | Bosten lake 137 Cs sedimentation rate 14 C AMS age |
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