| 末次冰盛期后格尔木河下切的时空变化及其构造意义 |
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| 引用本文： | 陈艺鑫,张梅,李川川,李英奎,刘耕年.末次冰盛期后格尔木河下切的时空变化及其构造意义[J].地理学报,2011,66(11):1540-1550. |
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| 作者姓名： | 陈艺鑫 张梅 李川川 李英奎 刘耕年 |
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| 作者单位： | 1. 北京大学城市与环境学院,北京 100871;
2. Department of Geography, University of Tennessee, Knoxville, TN 37996, USA |
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| 基金项目： | 国家自然科学基金项目(40571014;40971002); 国家重点基础研究发展规划项目(973项目)(2005CB422001)资助~~ |
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| 摘 要： | 格尔木河河谷中发育有四级河流阶地,均形成于末次冰盛期之后。阶地的形成由构造抬升驱动,四级阶地代表的河流下切过程反映了四次阶段性构造抬升。以三岔河和纳赤台为代表的中游河段,四次河流阶段性下切速率分别为16~13 ka BP (T4-T3),3.33~9.33 mm/a；13~11 ka BP (T3-T2),5.5~12 mm/a；11~5 ka BP (T2-T1),0.33~1 mm/a；5 ka BP (T1 至今),0.6~0.8 mm/a,下切速率自T4 至T1 先增快后减慢。上游小南川河段5 ka BP以来的平均下切速率为4 mm/a,显著大于三岔河和纳赤台河段,同期河流溯源侵蚀速率也较快,表明小南川局部地区全新世中期抬升强烈,应为西大滩断裂强烈活动所致。受区域性构造活动差异影响,格尔木河河流阶地在局部地区出现变形,其中在三岔河和最老冲积扇扇顶存在两个下切幅度和速度高峰值,而纳赤台河段下切和缓。表明控制昆仑河和野牛沟发育的昆仑河-野牛沟断裂、山前的红石沟断裂自末次冰盛期以来持续活动。其中,昆仑河-野牛沟断裂16~13 ka BP活动速率较快,到13~11 ka BP达到最快,11 ka BP后减慢,与河流中下游整体构造活动趋势一致。
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| 关 键 词： | 格尔木河 河流阶地 下切速率 构造抬升 |
| 收稿时间： | 2011-06-20 |
| 修稿时间： | 2011-08-31 |
Fluvial Incision Process and Its Tectonic Implications of Golmud River since Last Glaciation Maximum |
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| CHEN Yixin,ZHANG Mei,LI Chuanchuan,LI Yingkui,LIU Gengnian.Fluvial Incision Process and Its Tectonic Implications of Golmud River since Last Glaciation Maximum[J].Acta Geographica Sinica,2011,66(11):1540-1550. |
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| Authors: | CHEN Yixin ZHANG Mei LI Chuanchuan LI Yingkui LIU Gengnian |
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| Institution: | 1. College of Urban and Environmental Sciences, Peking University, Beijing 100871, China;
2. Department of Geography, University of Tennessee, Knoxville, TN 37996, USA |
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| Abstract: | The Golmud River originates from the Kunlun Mountains and drains into the Qaidam Basin on northern Tibetan Plateau.The Golmud River valley has experienced intensive tectonic movements since the Last Glacial Maximum,which deeply influenced the geomorphologic evolution of the river.In addition,well-developed fluvial terraces and sediments are preserved in the river valley and provide vital information for studying the environmental evolution in detail.Four terraces developed in the river valley since the Last... |
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| Keywords: | Golmud River fluvial terrace incision rate tectonic uplift |
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