石油与天然气地质 ›› 1986, Vol. 7 ›› Issue (2): 125-134.doi: 10.11743/ogg19860204

• 目次 • 上一篇    下一篇

中国挤压型盆地边缘的逆冲断层是潜滑俯冲作用形成的吗?——与罗志立同志商榷

李扬鉴   

  1. 化学工业部化学矿产地质研究院
  • 收稿日期:1985-06-28 修回日期:1985-10-14 出版日期:1986-06-25 发布日期:2012-01-16

HAVE OVERTHRUSTS ALONG THE MARGINS OF COMPRESSIVE BASINS IN CHINA BEEN FORMED BY BURIED SUBDUCTION?——Consulting with Luo Zhili

Li Yangjian   

  1. Geological Institute for Chemical Minerals, Ministry of Chemical Industry, Zhuoxian, Hebei
  • Received:1985-06-28 Revised:1985-10-14 Online:1986-06-25 Published:2012-01-16

摘要:

对广泛分布于中国西部和中部褶皱山系与盆地之间的逆冲断层的成因,罗志立用潜滑俯冲说进行解释,但软弱的新沉积层向早已褶皱固结的老山系下潜滑俯冲是不可能的。上述逆冲断层除少数属重力滑动构造外,主要系复式褶曲和挤压型盆地等广义纵弯褶曲的横向剪应力作用的结果,故可归属扇型逆冲断层类。

Abstract:

The origin of overthrust faults widely distributed between basins and folded mountain ranges in the west and central part of China has been explained by Luo Zhili in the theory of buried subduction.It is believed that these overthrust faults were normal ones which controlled half graben-like basins in their earlier stage.The filling of the thickest terrestrial sediments in the mountain front depressions later,and the buried subduction along sliding layer slopes of the buried muddy rocks type by gravity force that have made the surface of earlier normal faults above mentioned overturn and then become overthrust faults.Therefore,it is impossible for the newly-deposited soft formation to subduct toward the well-consolidated and folded mountain ranges.These overthrust faults,with the exception of a few from gravitation gliding structure,have resulted mainly from the process of lateral shear stress of vertical flexural fold,namely,multiple folds and compressed basins,which then can be attributed to the group of fan overthrust fault.The distribution and development of lateral shear stress within vertical flexural folds in both space and time has been studied in the concept of vertical flexural rod of material mechanics.The results from calculating in theory show that the maximum value of the vertical shear stress within the flanks of vertical folds is much stronger than that of the horizontal shear stress,as 3 times as that of later.