铜陵地区狮子山矿田侵入岩地球化学特征及成岩机制探讨Geochemical Characteristics and Petrogenesis of the Intrusive Rocks from Shizishan Ore Field,Tongling Region
陆顺富;李锦伟;曾键年;龚鹏飞;吴亚飞;李小芬;余冯力;
摘要(Abstract):
铜陵地区是长江中下游成矿带中重要的矿集区,以燕山期大规模岩浆-热液活动形成的Cu-Fe-Au多金属矿产为主。以狮子山矿田3类侵入岩体为研究对象,通过手标本和显微镜观察,将狮子山3类侵入岩体定名为辉石闪长岩、石英闪长岩和花岗闪长岩。对区内岩体地球化学组成、同位素资料及年代学数据的分析整理,推测出本区侵入岩的来源与成因:燕山期太平洋板块斜向俯冲欧亚大陆脱水产生的流体交代地幔楔并使其发生部分熔融形成上地幔玄武质岩浆,少部分与地壳物质发生了较低程度同化混染的玄武质岩浆上升侵位形成辉石闪长岩,大部分玄武质岩浆底侵下地壳熔融形成埃达克质岩浆,熔融作用产生的高温可以使中上地壳物质部分熔融形成浅部花岗质岩浆房。大部分埃达克质岩浆快速上升,直接侵位至地壳浅部并与地壳发生少量混染形成石英闪长岩,小部分埃达克质岩浆上升至浅部花岗质岩浆房与花岗质岩浆发生混合,侵位结晶形成花岗闪长岩。
关键词(KeyWords): 狮子山矿田;侵入岩;地球化学特征;埃达克岩;成岩机制
基金项目(Foundation): 中国地质调查局资源评价项目“长江中下游成矿带浅部与深部金属成矿作用耦合及成矿系统评价”(12120114038101);“长江中下游深部铜铁矿精细地球化学勘查技术研究”(1212011120866)
作者(Author): 陆顺富;李锦伟;曾键年;龚鹏飞;吴亚飞;李小芬;余冯力;
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