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| 金沙江奔子栏-达日河段大型泥石流堆积扇的成因机制 | |
| 引用本文： | 陈剑,崔之久,戴福初,许冲.金沙江奔子栏-达日河段大型泥石流堆积扇的成因机制[J].山地学报,2011,29(3). |
| 作者姓名： | 陈剑 崔之久 戴福初 许冲 |
| 作者单位： | 1. 中国地质大学,北京,工程技术学院,北京,100083 2. 北京大学城市与环境学系,北京,100871 3. 中国科学院地质与地球物理研究所青藏高原研究室,北京,100029 |
| 基金项目： | 国家自然科学基金青年基金项目 |
| 摘 要： | 金沙江上游奔子栏-达日河段属横断山区的干热河谷地带,河谷沿岸大型古泥石流堆积扇广泛发育,其成因却一直没有得到很好的研究.对该区瓦卡大型古泥石流堆积物进行了沉积结构、粒度、地球化学和孢粉等分析,揭示了泥石流的沉积环境及其形成过程.通过粗颗粒石英的光释光单片再生法(SAR)测年研究,获得金沙江上游奔子栏-达日河段古泥石流大规模暴发的年代为12 600～4 500 a BP.丰富的风化碎屑物源、陡峻的地形及雨季降水集中是该区古泥石流形成的主要原因.全新世早期青藏高原东南缘受西南季风加强的影响,气候趋于暖湿,季节性暴雨增加.金沙江上游干热河谷区大型泥石流堆积扇的发育年代暗示其是全新世早期西南季风加强作用下的地貌响应.从地质灾害防治的角度,由于现代气候因素导致泥石流灾害的频度和规模较小,预防该区地质灾害的重点应是防止人工砍伐树木和不合理的人工切坡导致对地表环境的破坏加剧. |
| 关 键 词： | 金沙江 干热河谷 泥石流堆积扇 气候变化 |
Genetic Mechanism of the Major Debris-flow Deposits at Benzilan-Dari Segment,the Upper Jinsha River |
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| CHEN Jian,CUI Zhijiu,Dai Fuchu,XU Chong.Genetic Mechanism of the Major Debris-flow Deposits at Benzilan-Dari Segment,the Upper Jinsha River[J].Journal of Mountain Research,2011,29(3). | |
| Authors: | CHEN Jian CUI Zhijiu Dai Fuchu XU Chong |
| Institution: | CHEN Jian1,CUI Zhijiu2,Dai Fuchu3,XU Chong3(1.School of Engineering and Technology,China University of Geosciences,Beijing 100083,China,2.Urban and Environmental Department,Beijing University,3.Division of Tibet Plateau,Institute of Geology and Geophysics,CAS,Beijing 100029,China) |
| Abstract: | The Quaternary debris-flow accumulations can provide rich information for geomorphic evolution,tectonic movement and climate change.There occur many Quaternary debris-flow accumulations in the southeastern(SE) marginal area of the Tibetan Plateau(TP),especially in valleys of the upper reach of the Jinsha River.The river segment between Benzilan to Dari of the upper Jinsha River belongs to the dry-hot valley type in the Henduan Mountainous region.Major old debris-flow accumulations are well developed in this... |
| Keywords: | Jinsha River dry valley debris flow southwest monsoon climatic change |
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