三江成矿带斑岩型矿床成矿模式与找矿方向研究

Study on metallogenic model and ore exploration of porphyry deposits in Sanjiang metallogenic belt

通过系统分析斑岩成矿作用,厘定出3种斑岩型矿床的成矿环境,建立了3种成矿环境下的斑岩型矿床成矿模式,即印支期岛弧俯冲造山斑岩型矿床成矿模式、燕山期造山后与伸展作用有关的斑岩型矿床成矿模式和喜山期陆内转换造山斑岩型矿床成矿模式。根据区域斑岩型矿床成矿模式和典型矿床的研究,总结出三江成矿带斑岩型矿床找矿模型。以找矿模型为基础,采用证据权重法,优选出5个斑岩型矿床成矿远景区,并定量圈定了19个找矿靶区,为本区斑岩型矿床找矿工作指出了方向。

Based on the systemic analysis of regional mineralization, three metallogenic settings were regulated, and three metallogen- ic models were established, they were metallogenic model of porphyry deposit on Indosinian in island-arc-subducted orogenic setting, metallogenic model of porphyry deposit on Yanshan Epoch in post-orogenic extension setting and metallogenic model of porphyry deposit on Xishan Epoch in an intra-continental transformation orogenic setting. The exploration model for porphyry deposit in the Sanjiang met- allogenic belt were summarized on the research of regional metallogenic model of porphyry deposit and typical ore deposits. Based on the regional metallogenic model of porphyry copper deposit, exploration model for porphyry copper deposit in Sanjiang metallogenic belt was summarized. On the basis of exploration model research, five metallogenetic targets were delineated, and nineteen exploration targets were delineated by weights of evidence modeling.