Sedimentology Revealment to Meso-Cenzoic Tectonic Movement Process of Altun Strike-slip Fault
中、新生代阿尔金走滑断裂系构造运动的沉积学揭示

In this paper,we consider the Altun strike\|slip fault zone and its surrounding fault zones with uniformed spread direction and similar motion mode to be the Altun strike\|slip fault system.Based on composition of these fault zones,extension scale,active period,activity behavior as well as lithofacies paleogeography of the Meso-Cenzoic sedimentary strata in the area of the Altun strike-slip fault system,seismic data interpretation of the upper sedimentary strata of the basin,and the fission-track dating of the Paleogene System sedimentary rock in the Chaixi depression and remote sensing geology,we discuss the tectonic movements process of The Altun strike\|slip fault.The results suggest that the general tectonic movement pattern of the Altun strike-slip fault system is in the uplift condition under the Indo-China movement action,and there is lack of the Jurassic deposition as denudation phase.With influence of Yanshain movement and week extension tectonics,the Altun strike-slip fault systems accepted the Jurassic deposition in the relative whole settlement,and the big Altun Lake was formed.At the middle and late Yanshan Period,the close of new Tethyan tectonic domain made the regional tectonic uplift,resulting in the big Altun lake disappeared.During the end of the Yanshan Period,the left\|lateral strike slip motion was developed within a regional range,and the Altun strike-slip fault was formed.After the Himalayan period,the southeast depression and the Qaidam basin came into the relative depression stage.The Paleocene thick sediments reveal that the Altun fault uplift began to raise,and the tectonic process of the Altun strike-slip fault intensified gradually,especially at the later of the Paleogene.With influence of this tectonic event,the Cenozoic Minfeng depression as a strike-slip pull-apart basin was formed by compressive deformation between the Altun strike\|slip fault and the north Minfeng salient,and the Ruoqiang depression as a pull\|apart basin was formed by compressive action among the Cheerchenhe River fault zone,Qiemo-Ruoqiang fault and Altun northern fault.