地理学报 ›› 2002, Vol. 57 ›› Issue (3): 319-326.doi: 10.11821/xb200203008

• 论文 • 上一篇    下一篇

滇西北老君山地区岩浆活动与 长江第一弯形成的关系

曾普胜   

  1. 中国地质科学院矿产资源研究所, 北京 100037
  • 收稿日期:2001-06-04 修回日期:2001-09-26 出版日期:2002-05-25 发布日期:2010-09-06
  • 作者简介:曾普胜 (1964-), 男, 副研究员, 博士后, 主要从事岩石学和矿床学研究。E-mail: zengpusheng@sohu.com
  • 基金资助:

    国土资源部资源与环境科技攻关项目(95-02-001-02)部分资助

Relationship between the Formation of the First Bent of Changjiang River and the Magmatic Activity in Laojunshan District

ZENG Pusheng   

  1. Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China
  • Received:2001-06-04 Revised:2001-09-26 Online:2002-05-25 Published:2010-09-06
  • Supported by:

    Project of the Ministry of Land and Resources, No.95-02-001-02

摘要:

在野外观察的基础上,对长江第一弯的形成提出了新认识。首次研究了始新世岩浆活动与长江第一弯形成的关系,提出长江第一弯为始新世老君山地区 (金沙江古河道) 强烈的岩浆活动阻塞了古金沙江,导致其上游形成堰塞湖,并在玉龙雪山和哈巴雪山之间决口,在高原隆升的同时河道快速下切,形成虎跳峡,是河水改道东流的结果;计算了处于青藏高原东端的研究区的隆升的幅度,对玉龙雪山而言,始新世至更新世,隆升幅度为3300 m,加上更新世以来的隆升高度700 m,累计隆升高度为4000 m左右。

关键词: 岩浆活动, 河道阻塞, 金沙江, 决口, 滇西北老君山, 长江第一弯

Abstract:

Based on field observations, the author proposes a new understanding on the formation of the First Bent of the Changjiang River. It is the first time to study the relationship between the formation of the First Bent of the Changjiang River and Eocene magmatic activity, suggesting that the First Bent of the Changjiang River is the result from choking of the strong magma activity in Eocene. As a result, the upstream of the river became a natural reservoir, with channel bursting into breach between Mt. Yulong and Mt. Haba, making Jinshajiang River run eastward. At the same time, the plateau uplift and the drastic dissection of river channel led to the formation of the Tiger Leaping Gorge. Taking Mt. Yulong as a base, the magnitude of uplifting in the study area (located in the eastern of the Tibetan Plateau) is calculated, with the magnitude being 3300 m from Eocene to Pliocene, adding 700 m since Pleistocene, totaling 4000 m or so.

Key words: magmatic activity, choking channel, Jinshajiang River, bursting, Laojunshan district, the First Bent of the Changjiang River