机构地区: 南京大学地球科学与工程学院内生金属矿床成矿机制研究国家重点实验室
出 处: 《大地构造与成矿学》 2012年第1期118-126,共9页
摘 要: 哈达特陶勒盖铅、锌矿区的辉绿岩是隐伏岩体。本文在野外地质工作和钻孔岩芯观察基础上,运用岩石化学和同位素地质学方法,通过主量元素、微量元素、稀土元素和铅同位素研究,探讨了辉绿岩岩石化学性质、形成构造环境及成岩物质来源。岩石化学研究表明,辉绿岩具有低硅、钛和高铁,大离子亲石元素(LILE)明显富集,高场强元素(HFSE)相对亏损的特征,形成于俯冲火山弧构造环境,属于碱性辉绿岩。Pb同位素显示辉绿岩具有岛弧玄武岩特征,成岩物质来源于岩石圈地幔,侵位过程中可能混染了部分地壳物质。 Major and trace elements as well as Pb isotope geochemistry study on the drill core samples of diabase from the Hardat Tolgoi Pb-Zn minefield were carried out to investigate its petrogenesis and tectonic setting. The results show that the diabase is enriched in LILE and depleted in HFSE, formed in volcanic arc environment, and derived from partial melting of lithospheric mantle with crustal contamination.