华南晚中生代发育大规模的岩浆活动及巨量金属成矿,成岩成矿作用一直是大花岗岩成矿省研究的主要内容.闽西浸铜湖铜钼矿床中发育有与矿化同时代的花岗闪长斑岩及花岗斑岩.为查明这两个岩体与矿化的关系,对其进行详细的岩石地球化学分析.研究表明:花岗闪长斑岩属弱过铝质岩,具埃达克质岩石的亲缘性.元素和同位素特征指示其为俯冲交代富集地幔来源,分离结晶作用控制着岩体的形成.花岗斑岩属过铝质岩,发生斜长石的分离结晶.花岗斑岩的Sr-Nd同位素组成排除华夏元古代陆壳基底物质及幔源岩浆参与的可能,指示其物质来源应为早期就位的火成岩或正变质岩.浸铜湖矿床形成于受古太平洋板块俯冲、柝返影响而形成的伸展构造环境.
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