The Characteristics of Proterozoic Stratum in Northern Area of Western Qinling

As the stratum survey of western Qinling went on,geologists applied tectonic analysis and tectonic-petrologic stratum method.Along with the petrological deformation and isotope age that was obtained in recent years,Xihanshui Group of Devonian period of western Qinling stratum was rerecognized.Proterozoic stratum was dismembered,and was temporarily named Wujashan Rock Group since it assumes a large and non-sequence stratum look and with a middle-deep range of deformation.The conclusion and the new cognition improved the level of basic geology study in western Qinling,especially t he Xihanshui Grounp,Devonian period.The results of this research also have import ant geological implications in tectonic evolvement research of western Qinling area and in the study of the galena-zinc mineral characteristics in Xihe-Chengxian belt.