| 长江三峡河流袭夺与河流起源 |
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| 引用本文： | 赵诚.长江三峡河流袭夺与河流起源[J].吉林大学学报(地球科学版),1996(4). |
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| 作者姓名： | 赵诚 |
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| 作者单位： | 地质矿产部宜昌地质矿产研究所 |
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| 摘 要： | 李四光有“黄陵背斜为华西、华东的分水岭，岭西之水流入归州盆地和四川盆地，岭东之水则向东流，袭夺……”的正确论断，但他“（袭夺）年代是第三纪末至早更新世初”的见解则过早。黄陵背斜西侧之水属古金沙江东支流，仅香溪至重庆段内竟有７３．３％的支流呈倒插；巫山至故陵镇８２．５ｋｍ间的Ｔ６、Ｔ５、Ｔ４阶地面沿江呈西倾，而Ｔ３、Ｔ２、Ｔ１阶地面沿江呈东倾，二者刚好反向。在重庆、奉节分别发现了鹅岭风口和白帝城风口，二者与倒插支流、反向阶地共同证实了此段属掉向（被袭夺）流段。由于２．０Ｍａ以来印度板块与亚欧板块碰撞所导致的西域上升，黄陵背斜遭冰后期和其它外营力剥蚀、降低，古金沙江南下水路被横断山封堵，西支流只好向东支流涌来，又借黄陵背斜东坡古长江向源侵蚀之机，终于０．１５～０．２０Ｍａ间切开黄陵背斜分水岭，形成新型长江
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| 关 键 词： | 长江三峡河流袭夺 袭夺高程／年代 鹅岭／白帝城风口 河流起源 |
RIVER CAPTURE AND ORIGIN OF THE YANGTZE GORGES |
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| Zhao Cheng.RIVER CAPTURE AND ORIGIN OF THE YANGTZE GORGES[J].Journal of Jilin Unviersity:Earth Science Edition,1996(4). |
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| Authors: | Zhao Cheng |
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| Abstract: | The Huangling anticline was divide of the ancient Yangtze and Jinsha river at the beginning of Quaternary period. Because of continental elevation resulted from the collision of Indian plate with Eurasian plate, the ancient Jinsha river was captured by the ancient Yangtze river at 0.15-0.20 Ma.B.P. at a height of 155-170 m . This is supported by the existence of refluent tributaries, reversed terraces and wind gaps. Among the current rivers on the world formed at the beginning of Quaternary period, the river capture of the Yangtze Gorges is a special example and shows close relation to ancient climate and neotectonism. So study on evolutional history of the river has important significance. |
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| Keywords: | river capture of Yangtze Gorges capture elevation/age Erling/Baidicheng wind gap origin of river |
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