雅鲁藏布大峡谷格嘎古堰塞湖沉积岩石磁学性质指示的溃决事件
文献类型：期刊论文
| 作者 | Liu Wei-Ming1,2 ; Cui Peng1; Lai Zhong-Ping2,3; Ge Yong-Gang1; Hu Kai-Heng1; Zhang Wen-Jing1; Su Chun-Jiang1; Yi Zhi-Yu4
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| 刊名 | 地球物理学报
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| 出版日期 | 2014-09-01 |
| 卷号 | 57期号:9页码:2869-2877 |
| ISSN号 | 0001-5733 |
| 关键词 | Paleo-dammed lake Rock magnetism Tsangpo gorge Outburst floods |
| 其他题名 | Sediment rock magnetic properties indicate outburst events for Gega dammed lake at the Tsangpo Gorge in the Tibetan Plateau |
| 通讯作者 | 刘维明 |
| 合作状况 | 国内 |
| 中文摘要 | 末次冰期时，在雅鲁藏布大峡谷入口处发育了一个古冰川堰塞湖，称为格嘎古堰塞湖.该堰塞湖是认识冰川阻江地貌效应的重要地质证据.古冰川堰塞湖可能会发生多次溃决洪水，通过堰塞湖沉积的分析可以获取堰塞期间的水文事件的信息.本文通过对古堰塞湖沉积39个样品多种磁学参数的详细分析发现，湖相沉积中的砂层低频磁化率（Xlf）为291×10-8m3/kg，泥质沉积的Xlf仅为42×10-8m3/kg；而非磁滞剩磁磁化率（XARM）和饱和等温剩磁（SIRM）的差别则较小.进一步的X-T、Loop和IRM研究以及XARM/Xlf表明，砂层中包含较多的粗颗粒磁铁矿是Xlf较高的主要原因，说明砂层中的磁性矿物没有经过风化破坏，应为近源沉积，并且快速埋藏，指示了溃决事件.本文的结果表明，利用岩石磁学性质以检测古堰塞湖溃决事件是一种可行的新方法. |
| 英文摘要 | A large ice-dammed lake exists at the entrance of Tsangpo gorge in the Tibetan Plateau. Many megafloods occured down the Tasangpo gorge during the last glaciation. The lacustrine sediments are important for understanding these periodic outburst floods. Through detailed rock magnetic studies of 39 lacustrine samples, we found the low frequency magnetic susceptibility (chi(If)) is high in fine sand and low in clay, but the value of susceptibility of anhysteretic remanent magnetization (chi(ARM)) and saturation isothermal remanent magnetization (SIRM) are similar. chi-T, Loop and IRM show that coarse-grained magnetite is the main magnetic minerals in fine sand. chi(ARM)/chi(If) also shows that the grain size of magnetite in fine sand is coarser than that in clay. Rock magnetic properties indicate that the fine sand of lacustrine sediment experienced no weathering damage and should be deposited near the source and then quickly buried. Thus, the rock magnetic properties of fine sand of lacustrine may indicate the outburst event, which could be a new method for detecting the event. |
| 学科主题 | 自然地理学 ; 第四纪地质学 |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Geochemistry & Geophysics |
| 研究领域[WOS] | Geochemistry & Geophysics |
| 关键词[WOS] | LACUSTRINE SEDIMENTS ; LATE PLEISTOCENE ; RIVER INCISION ; RAPID EROSION ; SUSCEPTIBILITY ; MISSOULA ; FLOODS ; ENVIRONMENT ; MEGAFLOODS ; EVOLUTION |
| 资助信息 | 国家自然科学基金（41171012，41301010，41172168）;中国博士后基金（2013M542401）;中国科学院山地灾害与地表过程重点实验室自主设置课题（110100L104）共同资助 |
| 收录类别 | SCI |
| 原文出处 | http://manu16.magtech.com.cn/geophy/CN/10.6038/cjg20140912 |
| 语种 | 中文 |
| WOS记录号 | WOS:000342479900012 |
| 公开日期 | 2014-09-25 |
| 源URL | [http://ir.imde.ac.cn/handle/131551/7285]  |
| 专题 | 成都山地灾害与环境研究所_山地灾害与地表过程重点实验室 成都山地灾害与环境研究所_山区发展研究中心 |
| 作者单位 | 1.Chinese Acad Sci, Inst Mt Hazards & Environm, CAS Key Lab Mt Hazards & Surface Proc, Chengdu 610041, Peoples R China 2.Chinese Acad Sci, State Key Lab Cryospher Sci, Cold & Arid Reg Environm & Engn Res Inst, Lanzhou 730000, Peoples R China 3.China Univ Geosci, Sch Earth Sci, Wuhan 430074, Peoples R China 4.Chinese Acad Geol Sci, Inst Geol, State Key Lab Continental Tecton & Dynam, Beijing 100037, Peoples R China |
| 推荐引用方式 GB/T 7714 | Liu Wei-Ming,Cui Peng,Lai Zhong-Ping,等. 雅鲁藏布大峡谷格嘎古堰塞湖沉积岩石磁学性质指示的溃决事件[J]. 地球物理学报,2014,57(9):2869-2877. |
| APA | Liu Wei-Ming.,Cui Peng.,Lai Zhong-Ping.,Ge Yong-Gang.,Hu Kai-Heng.,...&Yi Zhi-Yu.(2014).雅鲁藏布大峡谷格嘎古堰塞湖沉积岩石磁学性质指示的溃决事件.地球物理学报,57(9),2869-2877. |
| MLA | Liu Wei-Ming,et al."雅鲁藏布大峡谷格嘎古堰塞湖沉积岩石磁学性质指示的溃决事件".地球物理学报 57.9(2014):2869-2877. |
入库方式： OAI收割
来源：成都山地灾害与环境研究所
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