CRUSTOBODY’S MOVEMENT AND EVOLUTION IN NORTHERN XINJIANG
YANG Mu~(1,2), PENG Shenglin~1, YANG Bin~1 and LIU Liangming~1 (1. Institute of Diwa Theory and Metallogeny of Central South University, Changsha, HN 410083, China; 2. Laboratory of Marginal Sea Geology, Guangzhou Institute of Geochemistry and South China Sea Institute of Oceanology and Chinese Academy of Sciences, Guangzhou, GD 510640, China)
Northern Xinjiang, which is located in the hinterland of the Central Asia continent, is a compound continental crustoblock composed of crustoblocks of different origins. The long-term and complicated movement-evolution courses of this region resulted in the diversity of lithospheric structures and constructions. On the basis of previous researches and analysis of regional geological and geophysical data, and by applying crustobody theory and related research methods, this region can be divided into 4 diversiform crustoblocks. Furthermore, the Tianshan region should be subdivided into the eastern and western sections. After recapitulating the characteristics of movement and evolution of this region, it is suggested that the two sections, i.e., the eastern and western Tianshan, may belong to different geotectonic systems, which is demonstrated by evident differences in geophysics, basement and geotectonic evolution of pre-platform periods. In Meso-Cenozoic, after going through the platform period, the whole region successively underwent activation. The diversity of crustal and lithospheric structures and constructions of different zones brought up the different activated geological and structural characteristics.