崤山地区地质构造演化过程与成矿作用探讨

Exploration of the geological structural evolution process and mineralization in the Xiaoshan area

崤山地区位于华北陆块南缘,是河南西部金银多金属矿的重要成矿和找矿潜力区。本文通过对该区重要构造地质体和构造变形特征的分析,划分了该区自新太古代以来的构造演化过程,并总结其过程对区域多金属矿床的控制作用。结果表明:崤山地区构造演化过程划分为8个阶段(自新太古代—),分别为新太古代华北克拉通形成阶段、古元古代基底拼合阶段、中—新元古代板内伸展阶段、古生代板内俯冲阶段、中生代早期陆陆碰撞造山阶段、中生代中期陆内造山阶段、中生代晚期伸展拆离阶段和新生代盆岭演化阶段。其中,中生代晚期伸展拆离阶段是该区金银多金属矿的主要成矿阶段。

The Xiaoshan area,located on the southern edge of the North China block,is an important mineralization 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 area,this paper divide the tectonic evolution process,and analyz the control effect of the process on the regional polymetallic deposits.The results show that the tectonic evolution process of the Xiaoshan area is divided 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 Mesozoic and the stage of basin-range evolution in Cenozoic.Among of them,the late Mesozoic extensional detachment stage is the main metallogenic stage of gold-silver polymetallic deposits in this area.