摘要
本文从地貌、第四纪地层和新构造运动特点的角度，着重讨论了金沙江奔子栏－金江街段河谷的发育历史。通过近两年的野外调查，认为金沙江上游开始于中更新世早期，至中更新世中、晚期已完全贯通。九河－剑川－下关谷地并非金沙江的古河道，而奔子栏－尼西－中旬－小中甸－大具－丽江－鹤庆－金江街才可能是早更新世“古金沙江”的古谷地，但“古金沙江”由串珠状盆地组成。
This paper emphatically discussed the evolutionary history of the Jinsha river valleyfrom Benzilan to Jinjiangjie section from the angle of the features of landform ,strata of theQuaternary period and neotectonism. Through field investigation of the recent years,it wasbelieved that the upper reaches of the Jinsha River started in the early Middle pleistocene,andcompletely formed in the middle and late Middle pleistocene.The valley ofJiuhe-Jianchuan-Xiaguan was not suggested the palaeo-valley of the Jinsha River. Thepalaeo-valley of the Jinsha River at the Early pleistocene might develope along the valley ofBenzilan-Nixi-Zhongdian-Xiaozhongdian-Daju-Lijiang-Heqing-Jinjiangjie,but the‘palaeo Jinsha River’,was formed by the moniliform basin。
出处
《华东地质学院学报》
1994年第3期234-241,253,共9页
Journal of East China Geological Institute
关键词
金沙江上游
古河道
发育史
upper reaches of Jinsha River
ancient river courses
evolutionary history
