西秦岭甘肃段特大型金矿床的地质地球化学特征及其成岩成矿年龄

西秦岭是中国具有大型、特大型金矿成矿条件的成矿带，通过对西秦岭甘肃段4个特大型金矿之间及其卡林型金矿、造山型金矿的地质、地球化学特征对比研究表明：这4个特大型金矿均具有多期多次成矿的特点，且具有由卡林型金矿向造山型金矿过渡的特征，成矿作用发生在碰撞造山阶段的挤压向伸展转换期，代表了一种新的成矿类型，建议定义为"卡林-造山复合型"，特大型金矿成矿时间为127~216 Ma，成矿背景及成矿时间具有偏在性。

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.