Acta Geographica Sinica ›› 2002, Vol. 57 ›› Issue (3): 319-326.doi: 10.11821/xb200203008

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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:2002-05-25
  • Supported by:

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


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