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地球学报  2010 

蒙古国额尔登特特大型铜-钼矿床年代学与成因研究

DOI: 10.3975/cagsb.2010.03.03

Keywords: 年代学,含矿岩体,斑岩型铜-钼矿床,额尔登特,蒙古国

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Abstract:

额尔登特铜钼矿床是20世纪60年代蒙古国发现的一处特大型斑岩型矿床。本文对矿区内的含矿斑岩体-石英闪长岩开展了锆石SHRIMP和LA-MC-ICP-MS同位素测年。分析结果表明,含矿岩体形成时代在240Ma左右,这与矿石中辉钼矿的Re-Os等时线年龄(241.0±3.1Ma,MSWD值为1.02)大体一致,表明成岩成矿作用均发生在早三叠世末至中三叠世初。矿区范围内侵入岩体岩石地球化学研究表明,石英闪长岩、花岗闪长岩和安山岩以及煌斑岩均可能是同源岩浆演化产物,形成于岛弧环境,成岩物质来源较深,可能来自地幔或者熔融的年轻下地壳。硫、铅同位素和锇同位素初始比值显示,成矿物质主要来自含矿侵入岩体,但是也有其它来源。额尔登特斑岩型铜-钼矿床的成矿作用与蒙古?鄂霍次克洋的闭合所导致的构造-岩浆活动有关。

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