| 洛川黄土序列时间标尺的初步建立 |
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| 引用本文： | 鹿化煜,安芷生.洛川黄土序列时间标尺的初步建立[J].高校地质学报,1996,2(2):230-236. |
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| 作者姓名： | 鹿化煜 安芷生 |
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| 作者单位： | 中国科学院黄土与第四纪地质国家重点实验室，南京大学大地海洋科学系，陕西省气象局气象科学研究所 |
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| 摘 要： | 对厚１４０ｍ的洛川坡头黄土剖面黄土层以５ｃｍ，古土壤层以３ｃｍ系统采样，全部样品进行了室内磁化率测量。以黄土序列磁化率变化作为古季风气候变化的代用指标，根据第四纪冰期的Ｍｉｌａｎｋｏｖｉｔｃｈ理论，利用轨道调缠绵的方法初步建立了洛川黄支的时间标尺。通过古地磁场倒转时间的检验以及与宝鸡黄土序列时间标尺对比，表明本文所论述的时间标尺适用于该地区古环境演化的研究。
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| 关 键 词： | 黄土地层 时间标尺 轨道调谐 古土壤 古气候 |
A PRELIMINARY TIME SCALE FOR LOESS STRATIGRAPHY IN LUOCHUAN, CENTRAL CHINA |
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| Lu Huayu, An Zhisheng, Yang Wenfeng.A PRELIMINARY TIME SCALE FOR LOESS STRATIGRAPHY IN LUOCHUAN, CENTRAL CHINA[J].Geological Journal of China Universities,1996,2(2):230-236. |
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| Authors: | Lu Huayu An Zhisheng Yang Wenfeng |
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| Abstract: | A high--resolution sampling spacing 5cm in loess and 3cm in paleosol layers was finished for the 140 - meter-depth classic loess profile in Luochuan, central Chinese loess plateau in the summer of 1993. Magnetic susceptibilities of all samples were measured in Xi'an Laboratory of Loess and Quaternary Geology. We employ the magnetic susceptibility as proxy indexes of palaeomonsoonal climate change during the past 2. 5Ma. Based on the Milankovitch theory of Pleistocene ice ages, a preliminary time scale for this loess profile was set up. By comparing with the absolute magnetic reversal ages and orbital tuning time scale for Baoji loess section, it is proved that. our time scale is useful for the palaeoenvironmental study around this region. |
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| Keywords: | Luochuan loess stratigraphy time scale orbital tune |
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