CAJ | 학술논문

贵州中生代变形主要发生在燕山期,发育三幕褶皱变形、两幕逆冲和三幕走滑.根据区域对比、卷入褶皱的地层和褶铍间的叠加关系,判断三期褶皱的形成顺序依次为近东西向、北东向和南北向,时限在J_3-K_2之间.逆冲推覆构造主要由向北西或西逆冲的近南北向逆冲断层组成,大体与南北向褶皱同时形成;自雪峰构造带西缘向西,依次划分出根部带、中部带和前锋带.但是,在根部带识别出两幕逆冲推覆,其它两带各识别出一幕.走滑断层也有3个方向:东西向、北东向和近南北向.东西向走滑断层旱现出右行压扭的运动学特征,而大多数北东向走滑断层是左行张扭性质的.依据各个方向断层间的切割和限制关系,推测东西向走滑断层最早形成,其次是南北向逆冲断层,北东向走滑断层最晚活动.这些断裂和褶皱特征,总体表现出贵州多重多种复合联合的构造特征,最后,探讨了本区的构造成因模式.
귀주중생대변형주요발생재연산기,발육삼막습추변형、량막역충화삼막주활.근거구역대비、권입습추적지층화습피간적첩가관계,판단삼기습추적형성순서의차위근동서향、북동향화남북향,시한재J_3-K_2지간.역충추복구조주요유향북서혹서역충적근남북향역충단층조성,대체여남북향습추동시형성;자설봉구조대서연향서,의차화분출근부대、중부대화전봉대.단시,재근부대식별출량막역충추복,기타량대각식별출일막.주활단층야유3개방향:동서향、북동향화근남북향.동서향주활단층한현출우행압뉴적운동학특정,이대다수북동향주활단층시좌행장뉴성질적.의거각개방향단층간적절할화한제관계,추측동서향주활단층최조형성,기차시남북향역충단층,북동향주활단층최만활동.저사단렬화습추특정,총체표현출귀주다중다충복합연합적구조특정,최후,탐토료본구적구조성인모식.
The main Mesozoic deformation in the Guizhou Province is Yanshanian three-stage folding,two-stage thrusting and three-stage strike slipping.Three-stage folds of different strikes are divided based on their newest-involved strata in these folds and their superposition relationship.The earliest is nearly EW-striking folds,and the second is NE-striking folds,followed by the N-S-striking folds.The folds formed between Late Jurassic and Late Cretaceous.The thrust fault system consists of the top-to-northwest or top-to-west,NS-striking thrust faults coeval to the NS-striking folds.To the west of west margin of the Xuefeng basement,the thrust belt can be divided into three sections:the root zone,the middle zone and the frontal zone from the east to the west.It underwent two-stage thrusting in root zone.However,there is only one-stage thrusting in the other two zones.Three-stage,differentlyoriented strike-slip faults extend spatially parallel to axes of three folds and temporally later than the equivalent folding,respectively.EW-striking strike-slip faults are dextral and transpressional.However,NE-striking strike-slip faults are almost sinistral and transextenional.According to their intersection and confinement among these faults,it is obvious that EWstriking strike-slip faults occurred at the earliest stage,followed by NS-and NE-striking ones in sequence.At last,a possible dynamic model about deformation in Guizhou is proposed.