Geological, Geochemical Characteristics and Diagenetic Age of the Super-large Gold Deposits in Western Qinling, Gansu Province

The West Qinling metallogenic belt has good condition for forming large and super-large gold deposits in China. In this paper, the geological and geochemical characteristics of four super-large deposits in West Qinling, Gansu Province have been analyzed, and they are compared with the ones of Karlin-type and orogenic gold deposits. The results show that these four super-large gold deposits have many characteristics of multi-stage mineralization, and they have the transition characteristics of changing from Karlin-type gold deposit to orogenic gold deposit.The gold mineralization was occurred in the collision orogenic stage, which has been defined as "Carlin-orogenic compound type".The metallogenic age of these super-large gold deposits is 127~216 Ma, the metallogenic background and time show the metallogenic preferentiality.