施洞口地区的逆冲推覆体及其基本特征

The Reversed Thrust Nappes in Shidongkou, Guizhou and Their Basic Features

本文以1:5万区域地质调查新资料为基础,重点介绍了施洞口地区近年来首次圈定的具有飞来峰、构造窗、冲断体和双冲构造4种不同样式的逆冲推覆体。对它们的形成作用或形成机制进行了较详细的分析和探讨。初步认为,它们均形成于燕山期。此外,本文对具有特殊构造位置的施洞口断裂,其主要的产出状态、产状变化特征及由南东向北西的1—4次逆冲推覆作用及位移量亦进行了较详细的介绍和初步的估算。

Based on the new data collected in the 1 : 5000 regional geological survey, this paper introduces four different types of reversed thrust nappes like outside flying peaks, structure windows, thrusts and double thrust structures which have been marked in Shidongk-ou in recent years. The paper makes detailed analysis and approaches to their formation effect or formation mechanism, tentatively thinking that they were all formed in Yanshan period. Besides, the paper also makes a detailed introduction and preliminary estimation of Shidongkou rifts which have special structural positions, their main occurrances, occur-rance change features, and the SE -NW reversed nappe actions and displacement amount.