| 滇西北金沙江河流袭夺的研究——兼与任美锷先生商榷 |
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| 引用本文： | 何浩生
,何科昭
,朱祥民
,朱照宇.滇西北金沙江河流袭夺的研究——兼与任美锷先生商榷[J].现代地质,1989(3). |
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| 作者姓名： | 何浩生 何科昭 朱祥民 朱照宇 |
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| 基金项目： | 国家自然科学基金资助项目 |
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| 摘 要： | 本文根据实地调查与研究,对长期有争议的金沙江袭夺问题提出一些认识供讨论。从石鼓段金沙江河谷地貌发育、鸿文村—剑川谷地的地貌、第四纪沉积特征及其成因三个方面,论证了金沙江在石鼓、鸿文附近自早更新世以来河道并无明显变迁,鸿文—剑川谷地也不是金沙江的古道。
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| 关 键 词： | 金沙江 河流袭夺 河流阶地 |
A DISCUSSION ON THE PROBLEM OF RIVER-CAPTURING OF THE JINSHAJIANG RIVER IN NORTHWEST YUNNAN |
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| He Haosheng He Kezhao Zhu Xiangmin Zhu Zhaoyu.A DISCUSSION ON THE PROBLEM OF RIVER-CAPTURING OF THE JINSHAJIANG RIVER IN NORTHWEST YUNNAN[J].Geoscience——Journal of Graduate School,China University of Geosciences,1989(3). |
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| Authors: | He Haosheng He Kezhao Zhu Xiangmin Zhu Zhaoyu |
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| Institution: | He Haosheng He Kezhao Zhu Xiangmin Zhu Zhaoyu |
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| Abstract: | The argument on the river-capturing of the Jinshajiang river, i. e, the upper Yangtze River, in northwestern Yunnan Province has proceeded for decades. In 1981-1987, a series of detail research works on geomorphology, Quaternary sed iments and geologic structure were done in Jinshajiang valley between Wuzhu and Reshuitang and the valley from Hongwen to Jianchuan-the "desert Jinshaji ang Valley". Base on a large amount of first-hand data, following conclusions were reached.
1.In the Jinshajiang valley seven continuous terraces have been found in the upper, middle and lower Shigu and Hongwen village, which indicate that the Jinshajiang River has never altered its course since early Pleistocen;
2. In the valley between Hongwen and Jianchuan, the "three erosion terraces of old Jinshajiang" are now proved |o be the fault steps of the same planation
surface formed in the end of Pliocene, The composition of alluvialand pluvial gravels inside the valley is rigorously confined to the rock exposed around, which is sharply different from that in Jinshajiang valley. The "Jiuhe conglomerate". which was regarded as old Jinshajiang deposit is acturally only widely spreaded Eocene molasse deposit.
3. So, the Hongwen-Jianchuan valley can not be deemed as the old Jinshaji ang River valley but a fault valley controlled by the Jianchuan Fault Zone, where there are several fault basins and lakes in it. |
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| Keywords: | : Jinshajiang river-capturing river-terrace |
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