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矿床地质  2009 

大颗粒辉钼矿Re-Os同位素失耦现象及187Os迁移模式研究

Keywords: 地球化学,Re-Os年龄,失耦现象,迁移模式,辉钼矿,钨矿床,西华山

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Abstract:

对采自西华山钨矿的大颗粒辉钼矿样品的不同部位进行了取样,并对其年龄分别进行精确厘定,得到了不同的Re-Os模式年龄值,验证了失耦现象的存在。从原理上对失耦现象及其成因进行了解释,并在前人成果的基础上,探索性地提出了187Os可能的迁移模型。取样方式的不同会对辉钼矿的模式年龄产生很大影响,因此,在实际应用中一定要严格遵循“多取样,细磨碎”的原则,这对于能获得科学真实的与地质背景相符的Re-Os同位素地质年龄,从而深入探讨矿床成矿作用具有重要意义。

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