首页> 中文期刊> 《西北地质》 >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

         

摘要

The West Qinling metallogenic belt has good condition for forming large and superlarge 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 superlarge 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.%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.

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