Advances in Earth Science ›› 2000, Vol. 15 ›› Issue (4): 426-433. doi: 10.11867/j.issn.1001-8166.2000.04.0426

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THE MAJOR PROGRESSES IN THE RESEARCHES ON THE THRUST AND NAPPE TECTONICS OF OROGENIC BELTS

WU Yun-gao ,LI Ji-liang,FAN Jing-liang
  

  1. ①Laboratory of Lithosphere Tectonic Evolution,Institute of Geology and Geophysics,The Chinese Academy of Sciences,Beijing 100029,China;②The Department of Earth Science,University of Petroleum,Beijing102249,China
  • Received:1999-09-02 Revised:2000-01-04 Online:2000-08-01 Published:2000-08-01

WU Yun-gao,LI Ji-liang,FAN Jing-liang. THE MAJOR PROGRESSES IN THE RESEARCHES ON THE THRUST AND NAPPE TECTONICS OF OROGENIC BELTS[J]. Advances in Earth Science, 2000, 15(4): 426-433.

The researches on the thrust and nappe tectonics of orogenic belts are one of the important problems in the studies of orogenic belts. Cover thrust nappes, developing mainly in the outer part of the orogenic belts or the foreland fold and thrust belts, formed by the rule of thin-skinned tectonics; however,basement fold nappes, occurring mainly in the inner part of the orogenic belts, developed by the rule of thick-skinned tectonics. Although there are many big differences not only in their geometric and kinematic characteristics but also in their mechanics of formation, cover thrust nappes are directly related to base-ment fold nappes. The major progresses in the researches on the thrust and nappe tectonics of orogenic belts ,made in the last two decades, are summarized as follows:①apart from that the analyses of the geometric characteristics of the thrusts and their related folds in the foreland fold and thrust belts have become quantified, more comprehensive knowledge of their composite types and developing sequences has come to its existence, and common senses of the development models of the foreland fold and thrust belts have been achieved, which agree to the critical Coulomb taper model;②the techniques of cross-section balancing and restoring ,applied in the foreland fold and thrust belts, have changed from 2-dimensional approaches to 3-dimensional ones and become more and more computerized;③more deep understanding of the main types of the crystalline basement thrust and nappe tectonics C-type and F-type thrust sheets and their characteristics in the inner part of orogenic belts has been obtained;④new knowledge of the relationship between foreland fold and thrust belts and the crystalline basement thrust and nappe tectonics in the inner part of
orogenic belts and of their development models has uncovered. So far the key problems lying in the studies of the above-mentioned topics include:①the studies of the crystalline basement thrust and nappe tectonics in the inner part of orogenic belts are relatively weak;②the crystalline basement thrust and nappe tectonics in the inner part of orogenic belts became more complicated as result of their being overlapped and reformed by the strike-slip tectonics and the extensional tectonics formed in the late stage of orogenic belts,which make the studies of that more difficult;③more comprehensive and detailed deep geophysical data is short;④the relationship between the deformational and metamorphic history of the crystalline thrust sheets in orogenic belts and the formation mechanism and the exhumation process of UHP metamorphic rocks is still unclear. The above-mentioned problems should be paid more attention to, which also will become the studies trends in this field in the near future.

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