CAJ | 학술논문

柴达木盆地北缘地区,由北向南可划分为祁连山断褶山系、柴北缘逆冲推覆构造带、前陆滑脱拆离带及前陆盆地低应变区等四个构造带,且断褶构造的形成时间有自北向南逐渐变新的趋势。综合研究表明,印支旋回和三叠纪末的印支运动,是柴北缘前陆盆地北部边界——南祁连断褶山系的强化、定型时期,奠定了山前前陆盆地发育的基本格局;燕山旋回及白垩纪末的燕山运动对柴北缘逆冲推覆构造带的影响最为强烈,并使下第三系沉降-沉积中心向盆内迁移,且在这一带有构造圈闭雏型形成;喜马拉雅旋回在柴达木盆地有两次规模较大的构造运动,渐新世末的构造运动对柴北缘前陆滑脱拆离带影响最强,并使上第三系沉降-沉积中心进一步向盆内推移,且在这一带形成有关的构造圈闭;上新世末的构造运动是一次最强烈的构造运动,使柴北缘地区各断褶构造带基本定型。
시체목분지북연지구,유북향남가화분위기련산단습산계、시북연역충추복구조대、전륙활탈탁리대급전륙분지저응변구등사개구조대,차단습구조적형성시간유자북향남축점변신적추세。종합연구표명,인지선회화삼첩기말적인지운동,시시북연전륙분지북부변계——남기련단습산계적강화、정형시기,전정료산전전륙분지발육적기본격국;연산선회급백성기말적연산운동대시북연역충추복구조대적영향최위강렬,병사하제삼계침강-침적중심향분내천이,차재저일대유구조권폐추형형성;희마랍아선회재시체목분지유량차규모교대적구조운동,점신세말적구조운동대시북연전륙활탈탁리대영향최강,병사상제삼계침강-침적중심진일보향분내추이,차재저일대형성유관적구조권폐;상신세말적구조운동시일차최강렬적구조운동,사시북연지구각단습구조대기본정형。
The northern margin area of Qaidam basin is divided into four structural zones, from north toward south,the Qilianshan fault-folding mountain system, the thrust-overthrust structural zone, the foreland decollement-detachment zone and low strain zone in the foreland basin. For all the fault-folding structural zones, their forming time shows a tendency becoming younger and younger southward. The overall configuration shows the north boundary of foreland basin is at Qaidarn basin＇s northern margin and southern Qilian fault-folding mountain system are enhanced and fixed during the Indo-China cycle and Indo-China movement by the end of Triassic, so determining the basic development configuration of foreland basin in the foremont area. The Yanshan cycle and Yanshan movement by the end of Cretaceous, exerted very intensive influence on the thrust-overthrust structural zone. It makes the center of subsidence and deposition shifted into the basin and formed some structural trapment preliminarily. During the Himalayan cycle period two tectonic movements occurred in Qaidam basin both of bigger scale. The movement that occurred by the end of Oligocene shows strongest influence on Qaidam northern marginal foreland decollement-detachment zone, not only pushing the center of subsidence-deposition further into the basin but also forming structural trap related in this zone. All the fault-folding tectonic zones at the basins northern margin area are basically fixed by one most intensive structural movement at the end of Pliocene.