| 中国黄土10Be研究进展 |
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| 引用本文： | 沈承德,刘东生.中国黄土10Be研究进展[J].地球科学进展,1995,10(6):590-596. |
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| 作者姓名： | 沈承德 刘东生 |
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| 摘 要： | ８０年代中期，中国和瑞士科技工作者开始联合进行黄土＾１０Ｂｅ研究。建立了黄土＾１０ＢｅＡＭＳ测量的理想流程，发现了＾１０Ｂｅ在黄土地层良好保存性等重要地球化学行为特征，确认了黄土＾１０Ｂｅ研究具有重要意义。对洛川黄土部面０．４－１３８ｍ段６００多个样品进行了＾１０Ｂｅ测定，建立了２．５Ｍａ以来大陆堆积物同位素记录曲线。
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| 关 键 词： | 黄土 铍 地球化学 |
ADVANCE IN 10Be STUDY IN CHINESE LOESS |
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| Shen Chengde,Yi Weixi,Liu Dongsheng.ADVANCE IN 10Be STUDY IN CHINESE LOESS[J].Advance in Earth Sciences,1995,10(6):590-596. |
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| Authors: | Shen Chengde Yi Weixi Liu Dongsheng |
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| Institution: | 1.Guangzhou Institute of Geochemistry, Academia Sinica, Guangzhou 510640;2.Institute of Geology, Academia Sinica, Beijing 100029 |
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| Abstract: | In the middle of 1980’s, an effective procedure for 10Be measurement in loess by AMS has been established. Some important geochemistry behaviors such as good preservation of 10Be in loess strata have been observed, showing obviously that the investigation on 10Be in loess would be very significant. A total of more than 600 samples from the upper 0.4~138m of the Luochuan section was analysed for 10Be concentrations and an isotopie curve of continental deposition since 2.5Ma has been established. Relative increase of 20~25% of 10Be concentration within 20~30ka duration are observed in the vicinity of the geomagnetic reversals. The linearity of relationship between accumulation rate and 10Be flux of loess is also astonishingly good. It reveals a new way for the dating of loess strata. Both the event of Raisbeck peak at 35000 a BP and 10Be/26Al ratio have been studied, which are expected to be new dating methods for loess strata. Based on 10Be-susecptibility model with a new concept of magnetic material flux, pedogenic ferromagnetic material flux in Chinese loess have been estimated quantitatively and average paleorainfall values in Luochuan region have been calculated. The concentrations of in situ cosmogenic 10Be in quartz from loess have been measured accurately and the erosion rates of the source regions have also been calculated. |
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| Keywords: | Loess 10Be syudy |
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