| 高分辨率洛川剖面黄土磁性地层学 |
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| 引用本文： | 刘维明,张立原,孙继敏.高分辨率洛川剖面黄土磁性地层学[J].地球物理学报,2010,53(4):888-894. |
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| 作者姓名： | 刘维明 张立原 孙继敏 |
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| 作者单位： | 中国科学院地质与地球物理研究所新生代地质与环境重点实验室，北京 100029 |
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| 基金项目： | 国家自然科学基金项目（40830104）资助. |
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| 摘 要： | 洛川剖面作为经典的黄土剖面，磁极性地层界线的具体位置还不清楚.通过对洛川黄土-古土壤序列以10 cm间隔的古地磁研究，厘定了磁极性界线的具体位置：（1）MB (Matuyama-Brunhes) 界线位于53 m处，S8的上部.（2）Jaramillo位于67.8~72.5 m，上界在S10的上部，其下界位于L13的顶部.（3）Olduvai位于107.2~114.2 m，上界位于S25的顶部，相当于WS2的上部，其下界位于L29的上部，相当于WL2的上部.4）并未检测到Matuyama的底界，可能位于红粘土内.
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| 关 键 词： | 洛川黄土 磁性地层 极性事件界线 |
| 收稿时间： | 2009-07-10 |
| 修稿时间： | 2010-03-12 |
High resolution magnetostratigraphy of the Luochuan loess-paleosol sequence in the central Chinese Loess Plateau |
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| LIU Wei-Meng,ZHANG Li-Yuan,SUN Ji-Min.High resolution magnetostratigraphy of the Luochuan loess-paleosol sequence in the central Chinese Loess Plateau[J].Chinese Journal of Geophysics,2010,53(4):888-894. |
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| Authors: | LIU Wei-Meng ZHANG Li-Yuan SUN Ji-Min |
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| Institution: | Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China |
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| Abstract: | The Luochuan section is one of the best sections in the central Loess Plateau, but the exact stratigraphical positions of the magnetic polarity boundaries are not well studied. In this paper, we report detailed paleomagnetic investigations of the loess-paleosol sequences at Luochuan. Our results indicate that the Matuyama/Brunhes Boundary occurs at the top of soil S8 and the upper and lower boundaries of the Jaramillo Normal Subchron occur at the top of soil S10 and loess L13, respectively. The upper and lower boundaries of the Olduvai Normal Subchron occur at the top of soil S25 and loess L29, corresponding to the top of previous divided units WS2 and WL3. We did not find the lower boundary of Matuyama Chron in this study. |
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| Keywords: | Loess-paleosol Magnetostratigraphy Magnetic polarity boundaries |
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