中朝地台北缘东段的平移剪切和推覆构造

STRIKE-SLIP SHEARING AND NAPPE STRUCTURE IN THE EASTERN SECTOR OF THE NORTHERN MARGIN OF THE SINO-KORFAN PLATFORM

本文指出,在中朝地台北缘东段的辽中东部、吉林西南部地区,平推断裂和冲断推覆构造十分发育。其中北东向左行平移断裂,以密山—抚顺断裂带为代表,它在印支—燕山早期活动最激烈,它把中朝地台北缘断裂带及加里东和华力西褶皱带错开的幅度达130～160km。而呈东西至北西向的冲断推覆构造,主要分布在密—抚断裂带的东南侧,它造成了横向上地壳大规模的缩短,其自然应变量为50～75%。以上两者有着密切的成因联系,在中生代早中期融为一体。

NE-trending sinistral strike-slip faults and near E-W-,NNW-and NW- trending thrust nappe structures are quite well developed in eastern Liaoning and western Jilin in the eastern sector of the northern margin of the Sino- Korean platform.The stsike-slip faults are represented by the Mishan-Wushun fault zone.(southwestern sector).It originated in the Indcsinian period and inte- nse strike-slip shearing took place in the Indosinian-early Yanshanian period.Nappes are mainly recognized on the southeastern side of the Mishan- Fushun fault Zone.Its history may be traced back to the Caledonian period. In the early-middle Mesozoic,the strike-slip faults and nappes are integrated as a whole in the study area and combined to control the tectonic development of the area.The Mishan-Fushun fault zone displaced sinistrally the Sino-Korean