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地球学报  2010 

蒙古国阿林诺尔钼矿床辉钼矿Re-Os同位素年龄及地质意义

DOI: 10.3975/cagsb.2010.03.08

Keywords: Re-Os同位素年龄,辉钼矿,成矿时代,阿林诺尔,蒙古国

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Abstract:

通过对蒙古国苏赫巴托尔省阿林诺尔钼矿7件辉钼矿样品进行Re-Os同位素分析,获得的同位素模式年龄介于(225.7?3.5)Ma~(227.5?3.4)Ma之间以及一个相关性很好的等时线年龄(227.7?3.1)Ma(2?,MSWD=0.066)。模式年龄和等时线年龄结果集中一致,为研究阿林诺尔钼矿床的形成时代提供了一个准确的时限。该矿床的成矿年龄与阿林诺尔黑云母花岗岩的形成时代比较一致。据此可以推断阿林诺尔钼矿床与含矿围岩黑云母花岗岩体的形成时间均为中三叠世末,属印支期构造?岩浆活动的产物。阿林诺尔钼矿床辉钼矿样品的Re含量为26.00?10–6~66.40?10–6,表明其成矿物质来源为壳幔混合来源。

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