Oil & Gas Geology ›› 2006, Vol. 27 ›› Issue (2): 152-158.doi: 10.11743/ogg20060203

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Evolution of Gan-Shaan paleochannel during Early and Middle Jurassic in Ordos basin

Zhao Junxing, Chen Hongde   

  1. Chengdu University of Technology, Chengdu, Sichuan, 610059
  • Received:2006-02-13 Online:2006-04-25 Published:2012-01-16

Abstract:

The Upper Triassic Yanchang Fm underwent denudation and incision of river valley to different degrees before the deposition of Lower and Middle Jurassic in Ordos basin due to the strong tectonic uplifting du-(ring) Indosinian movement,resulting in rolling paleotopography.Five major paleo-streams,including Gan-Shaan and Qingxi,were developed in early Jurassic'of which Gan-Shaan paeo-stream was the main stream channel.In the Gan-Shaan paleo-stream drainage area, the strata from Fuxian Fm to Yan'an Fm have different sedimentary and palaeogeographic characteristics,and they altogether reflect the structural and sedimentary evolution history of the basin.

Key words: Gan-Shaan paleo-stream, palaeogeomorphology, Fuxian Formation, Jurassic, Yan'an Formation, (Ordos) basin

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