Shaanxi Mianlue Rather Triangular Geological Structure Characteristics, Evolution And Mineralization Of The Relationship,

The Mianluening triangluar region locates in the north margin of YangZi plate,which is seperated from Qinling Orogenic belt by Mian-lue suture zone,with strong tecˉtonic movement and rich mineral resources as a triangluar block.The stratigraphy consists of two parts,basal and drape rock series.Undergoing tectonic process of the different stages and patterns,it forms complex tectonic landscapes,and control the forming and distribution of the different type of metallic mineral resources. Based on the new knowledge and thought in the theory of plate-tectonic and dyˉnamics of the continent,and by means of regional route geologic survey and tectonic analˉysis of the stress region and synthetic analysis of the different course and technical method,combined with the tectonic evolution history of adjacent tectonic unit,the inflecˉtional style,deformational series,tectonic frame and tectonic evolution history of the triˉangluar region are established.The tectonic evolution and ore-forming process in this reˉgion are also discussed.This paper suggested that this region mainly underwent tectonic evolution and ore-forming process of the different stage and pattern:一.The feature of tectonic evolution 1.The stage of basal formation and evolution Jinning movement is the key stage of this regional basal formation.The triangluar region emerge basic suture along Xiakouyi-Heimulin.It not only formed ophiolitic melange,but also formed complex tectonic Combiˉnation which are Hejiayan terraind,Da'an terrain and Bikon terrain of the middle-late proterozoic,and formed basal metamorphic rock series.The basal rock series splice in Jinˉning movement formed strong fold,deformational and metamorphic process,and made penetrative foliation and ductile shear zone. 2.Tectonic process of drape rock deformational stage and making the basal rock series superimposed regeneration. ①The Chengjiang stage(800-600Ma).On the regional extension background,the===================...