REGIONAL GEOLOGY AND PROSPECTING DIRECTION OF CUOGOU-SIDALONG COPPER (ZINC) METALLOGENIC BELT IN GANSU PROVINCE

The Cuogou-Sidalong copper (zinc)metallogenic belt is located in the spreading ridge volcanic rock belt of Ordovician back-arc basin and island arc.Five centralized mineral areas are included in the belt.Studying on typical deposits in the belt demonstrates that the deposits are formed in an extended geologic setting and occurred in the basic volcanic lava volcanic clastic sedimentary rocks in the middle-upper part of ophiolite suite.The ore bodies are controlled by paleovolcanic apparatus and its original structural fractures.Based on the analysis of ore-forming condition,the authors suggest a necessary work on Bailanggou area and Xiaoshashi area,where ophiolite suite is well developed and with Cu chemical anomalies and sign of submarine hydrothermal solution spouting.