| 柴西西岔沟新近系磁组构特征对环境变化的响应 |
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| 引用本文： | 高军平,李艾银,宋春晖,彭杨宏,张伟林,李生喜.柴西西岔沟新近系磁组构特征对环境变化的响应[J].沉积学报,2009,27(1):128-136. |
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| 作者姓名： | 高军平 李艾银 宋春晖 彭杨宏 张伟林 李生喜 |
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| 作者单位： | 兰州大学西部环境教育部重点实验室&资源与环境学院 兰州 730000 |
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| 基金项目： | 国家重点基础研究发展规划(973计划)，国家自然科学基金委青年科学家群体研究项目，教育部重大项目 |
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| 摘 要： | 通过对柴达木盆地西部(简称柴西地区)的干柴沟背斜南西翼的西岔沟层型剖面进行系统测制和2～3 m等间隔磁性地层学、磁化率各向异性系统采样，并进行精确测量，利用在该区建立的高分辨率、高精度磁性地层年代资料，结合沉积学等研究，讨论了磁化率各向异性参数变化趋势对环境的指示，并揭示在约23～6.2 Ma期间环境演化经历了三个阶段:Ⅰ阶段(22.4～13.4 Ma)为湿润环境；Ⅱ阶段(13.4～8.2 Ma)为温干环境向干冷转型；Ⅲ阶段(8.2～6.2 Ma)气候转冷变干且变化更复杂。认为7.8 Ma以来气候转型及有规律的变化与现代季风形成有关。为青藏高原的隆升过程及其环境效应提供可靠资料。
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| 关 键 词： | 磁组构 柴达木盆地 气候变化 西岔沟 |
| 收稿时间： | 1900-01-01 |
Response of Magnetic Fabric of Xichagou Section in Late Tertiary to Climate Change,Western Qaidam Basin |
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| GAO Jun-ping,LI Ai-yin,SONG Chun-hui,PENG Yang-hong,ZHANG Wei-lin,LI Sheng-xi.Response of Magnetic Fabric of Xichagou Section in Late Tertiary to Climate Change,Western Qaidam Basin[J].Acta Sedimentologica Sinica,2009,27(1):128-136. |
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| Authors: | GAO Jun-ping LI Ai-yin SONG Chun-hui PENG Yang-hong ZHANG Wei-lin LI Sheng-xi |
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| Institution: | Key Laboratory of Western China’s Environmental Systems (Ministry of Education) & School of Resources and Environmental Sciences, Lanzhou University, Lanzhou 730000 |
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| Abstract: | Through equidistantly sampling on 2～3 meters and accurate systematic measurement of samples of Xichagou stratotype section, located in southwesern limb of Ganchaigou anticline in western Qaidam Basin(Chaixi area) ,integrated high resolution and high precision magnetostratigraphy and sedimentological study in this section, authors think the changing trends of magnetic fabric parameters of sedimentary rocks may act as proxies of climate change.It was indicated that environmental change between 22.4 to 6.2 Ma may divide into three stages: first stage: humid context between ~22.4 to 13.4 Ma; secondary stage: warm arid environment transformed arid cold one from 13.4 to 8.2 Ma, and third stage from 8.2 to 6.2 Ma, climate lasted dry cold, and more complexly. It can be considered that rhythm of climate change or tectonism correlated to formation of modern monsoon since 7.8 Ma. This result provides available evidence for the uplift process of Tibetan Plateau and its environmental effectes. |
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| Keywords: | magnetic fabric Qaidam Basin climate change Xichagou |
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