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地质学报  2009 

西藏工布江达县沙让斑岩钼矿床辉钼矿铼-锇同位素年龄及其地质意义

, PP. 698-704

Keywords: 铼-锇同位素年龄,辉钼矿,斑岩钼矿,念青唐古拉,主碰撞期成矿,西藏

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Abstract:

沙让钼矿是念青唐古拉地区扎雪―亚贵拉成矿带的重要矿床，是西藏第一个达详查程度的独立钼矿，初步的勘查成果表明，钼资源量已经达到大型规模。为了查明念青唐古拉成矿带是否存在主碰撞期的大规模成矿作用，对沙让亚贵拉洞中拉矿集区沙让斑岩钼矿的7件辉钼矿样品进行了ReOs同位素分析，辉钼矿？？187？Re的含量22.75~46.66（μg/g），？？187？Os的含量为19.98~40.32（ng/g），辉钼矿的模式年龄分布在51.57~52.69Ma的范围内，模式年龄较为一致，所获ReOs等时线年龄为51±1.0Ma（MSWD=0.55）。该成矿年龄对应于冈底斯带主碰撞期岩浆岩底侵作用事件（介于47.0～52.5Ma之间（大约50Ma的始新世)），也与形成林子宗群帕那组43.93～53.52Ma的火山事件一致，由此表明，冈底斯构造岩浆带存在主碰撞期的大规模成矿，沙让花岗斑岩型钼矿形成于始新世早期，而分布于沙让花岗斑岩外4km范围内的矽卡岩型热液脉型铅锌铜银（Mo）多金属矿可能也属该时期成矿的产物。

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