河南省西峡─淅川─内乡─带燕山潮冲断推覆构造研究

本文在区域地质填图的基础上，通过详细的中型构造研究和区域地质特征分析，确立了研究区的冲断推覆构造格局，讨论了浅层次冲断层带内部的构造几何学特征及冲断推覆构造运动学问题。本区晚燕山期由北向南的冲断推覆作用，控制了区内地层与岩浆岩带的展布，导致了变质相带的缺失和变质梯度的倒置，并造成了上百公里的上部地壳缩短。研究表明，纵向的区域性高角度断裂（商－丹断裂）不是重要的大地构造单元分界线。

A STUDY ON THE YANSHANIA THRUST-NAPPE TECTONICS IN THE AREA OF XIXIA-XICHUAN-NEIXIANG COUNTIES, HENAN PROVINCE

On the basis of the geological mapping and detailed research of mesoscopic structuralgeometric features, as well as analysis of regional geology, the tectonic framwork in thestudy area is determined as an imbricate thrust systems. Both the structural geometry inmajor thrust fault zone and the kinematics of thrust systems are discussed. The Late Yanshanian south-ward thrusting not only brought about the characteristic distribution ofstrata and intrusions in this area, but also resulted in the missing of metamorphic belt along Linting thrust and the development of inverted isograd along Qinling and Doulingthrust. The least slip estimates for the four major thrust faults is 100 km in total. It isshown that the two high-angle faults which extend along the strike of mountain belt (e. g.Shangnan-Danfeng fault) are not an important collision zone as inferred previously.