| 金沙江石鼓-宜宾河段的贯通与深切地貌过程的研究 |
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| 引用本文： | 杨达源,韩志勇,葛兆帅,胥勤勉,陈可峰,徐永辉,李郎平,黄典,鹿化煜.金沙江石鼓-宜宾河段的贯通与深切地貌过程的研究[J].第四纪研究,2008,28(4):564-568. |
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| 作者姓名： | 杨达源 韩志勇 葛兆帅 胥勤勉 陈可峰 徐永辉 李郎平 黄典 鹿化煜 |
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| 作者单位： | 南京大学地理与海洋科学学院,南京,210093 |
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| 基金项目： | 高等学校博士学科点专项科研基金项目 |
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| 摘 要： | 近年来,在长江金沙江石鼓-宜宾河段进行了大量的调查研究,发现了云南巧家附近的古河谷;并在金沙江永善-宜宾河段两岸多处发现了"高阶地","高阶地"堆积物的物质成分比较单一,而且互相之间有明显差别。根据各地"高阶地"堆积物的测年资料,推测金沙江云南永善-四川宜宾河段的袭夺贯通,发生在距今103万年左右;禄劝乌东德峡谷-金坪子河段的袭夺贯通是在距今约80万年左右;虎跳峡峡谷的贯通并袭夺古中甸河大约发生在距今98万年前后。金沙江贯通以来强烈深切,平均深切速率为25～30cm/ka,但近十多万年以来平均深切速率达到99～77cm/ka。
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| 关 键 词： | 金沙江 高阶地 河流袭夺 深切速率 |
| 收稿时间： | 2008-03-15 |
| 修稿时间： | 2008-04-26 |
GEOMORPHIC PROCESS OF THE FORMATION AND INCISION OF THE SECTION FROM SHIGU TO YIBIN OF THE JINSHAJIANG RIVER |
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| Yang Dayuan,Han Zhiyong,Ge Zhaoshuai,Xu Qinmian,Chen Kefeng,Xu Yonghui,Li Langping,Huang Dian,Lu Huayu.GEOMORPHIC PROCESS OF THE FORMATION AND INCISION OF THE SECTION FROM SHIGU TO YIBIN OF THE JINSHAJIANG RIVER[J].Quaternary Sciences,2008,28(4):564-568. |
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| Authors: | Yang Dayuan Han Zhiyong Ge Zhaoshuai Xu Qinmian Chen Kefeng Xu Yonghui Li Langping Huang Dian Lu Huayu |
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| Institution: | School of Geographic and Oceanographic Sciences, Nanjing University, Nanjing 210093 |
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| Abstract: | Our field investigation on the Jinshajiang River section between Shigu and Yibin in recent years have discovered an ancient river valley close to Qiaojia in Yunnan Province.Some "high terraces" along the section of Jinshajiang River between Yongshang County,Yunnan Province to Yibin City,Sichuan Province are also found.The sediment components of these "high terraces" are considerably uniform but obviously differ from each other.Dating results of sediments from the"high terraces" show that the section of Jinshajiang River between Yongshan County of Yunnan Province and Yibin City of Sichuan Province was formed by river capture 1.03Ma ago,that between Wudongde Gorge in Luquan and Jinpingzi was also formed by river capture 0.8Ma ago.The Hutiaoxia Gorge was formed and captured the ancient Zhongdianhe River 0.98Ma ago.Extensive incision of the Jinshajiang River has taken place since its formation.An average incision rate of 25～30cm/ka is estimated,and the incision rate increases up to 99～77cm/ka in the past 100ka. |
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| Keywords: | Jinshajiang River high terrace river capture incision rate |
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