离石断裂带构造特征及演化

STRUCTURAL FEATURE AND EVOLUTION OFLISHI FRACTURAL ZONE

离石断裂带位于鄂尔多斯盆地与山西隆起之间，北段以雁行断裂系为特征，南段则主要为强烈挤压剪切。北段活动始于晚太古代末，具有硅镁层断裂特征，南段活动始于中三叠世，为硅铝层断裂，晚三叠世南、北连成一体。此一断裂并非岩石圈断裂，应属壳断裂性质，因为它所分隔的不是活动带与稳定区，而是华北板块内部的次级构造单元。

Lishi fractural zone, situated between Ordos Basin and Shanxi Rise,is characterized by.en echelon fault system in its north section and compresso-shear structures in south section.The faulting of the north section started in Late Paleozoic and the system has the property ofsimasphere fault;the compresso-shear started in Middle Triassic and the structures are considered to be sialsphere faults. The fault zone is not in lithosphere but in the earth crust since'it does not separate active zone from stable zone but secondary struetural units within NorthChina Plate