【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。更多还原

【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.更多还原