Exploration of the geological structural evolution process and mineralization in the Xiaoshan area
The Xiaoshan area,located on the southern edge of the North China block,is an important mineral-ization and prospecting potential area for gold silver polymetallic deposits in western Henan.Basing on the observation of the important structural geological bodies and structural deformation characteristics in this ar-ea,this paper divide the tectonic evolution process,and analyz the control effect of the process on the re-gional polymetallic deposits.The results show that the tectonic evolution process of the Xiaoshan area is di-vided into eight stages(since Neoarchean):the formation stage of North China Craton in Neoarchean,the stage of basement assembly in Paleoproterozoic,the stage of intraplate extension in Meso-Neoproterozoic,the stage of intraplate subduction in Paleozoic,the stage of continental collision orogeny in early Mesozoic,the stage of intracontinental orogeny in middle Mesozoic,the stage of extensional detachment in late Mesozo-ic and the stage of basin-range evolution in Cenozoic.Among of them,the late Mesozoic extensional detach-ment stage is the main metallogenic stage of gold-silver polymetallic deposits in this area.
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