CAJ | 학술논문

为了更好认识柴北缘晚海西—印支期古构造应力特征与演化过程，在天峻快日玛乡、城墙沟、石灰沟等地区详细野外观测的基础上，利用地层恢复和古构造应力反演技术对柴北缘及邻区石炭系—新生界构造观测数据进行分析。结果表明晚二叠世—中三叠世，柴北缘在南—北向挤压作用下向北俯冲碰撞，盆地内部上二叠—中三叠统缺失。晚三叠世开始，西秦岭斜向碰撞柴达木盆地，柴北缘进入造山阶段，所受挤压作用方向转变为北西—南东向，盆地内大范围缺失上三叠统。晚海西—印支期柴北缘内部二叠纪—三叠纪地层大面积剥蚀加之该期强烈挤压作用造成尕海南山石炭系与白垩系、旺尕秀煤矿石炭系与侏罗系之间的角度不整合，意味着下伏石炭系可能遭受强烈破坏。
위료경호인식시북연만해서—인지기고구조응력특정여연화과정，재천준쾌일마향、성장구、석회구등지구상세야외관측적기출상，이용지층회복화고구조응력반연기술대시북연급린구석탄계—신생계구조관측수거진행분석。결과표명만이첩세—중삼첩세，시북연재남—북향제압작용하향북부충팽당，분지내부상이첩—중삼첩통결실。만삼첩세개시，서진령사향팽당시체목분지，시북연진입조산계단，소수제압작용방향전변위북서—남동향，분지내대범위결실상삼첩통。만해서—인지기시북연내부이첩기—삼첩기지층대면적박식가지해기강렬제압작용조성소해남산석탄계여백성계、왕소수매광석탄계여주라계지간적각도불정합，의미착하복석탄계가능조수강렬파배。
In order to investigate the Late Hercynian-Indosinian paleotectonic stress characteristics and tectonic evolution on the northern margin of the Qaidam Basin, the authors analyzed the data of Carboniferous-Cenozoic tectonic features obtained in Kuairimaxiang, Chengqianggou, Shihuigou and some other areas by using stratigraphic recovery and paleotectonic stress inversion techniques. Under the influence of SN compression, the north margin of Qaidam underwent northward subduction, collision and denudation in the Late Permian–Middle Triassic period. From the Late Triassic, the collision between western Qinling and Qaidam caused the change of the orientation of the compressive stress into NW-SE, which resulted in the considerable loss of the Upper Triassic strata and local deposition of the Upper Triassic conglomerate on the northern margin of the Qaidam Basin. An analysis shows that voluminous denudation of the Permian-Triassic strata and the angular unconformity between Cretaceous and Carboniferous strata in Gahainanshan area and between Jurassic and Carboniferous strata in Wanggaxiu area caused by strong compression might indicate the destruction of the underlying Carboniferous strata in Late Hercynian-Indosinian period.