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科学通报  2011 

Mo同位素对中低温热液成矿作用的指示:以粤西大降坪黄铁矿矿床为例

, PP. 1378-1385

Keywords: Mo同位素,成矿环境,粤西大降坪,黄铁矿矿床

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Abstract:

报道了粤西大降坪黄铁矿矿床的Mo同位素组成,其Ⅲ号矿体的δ97/95Mo变化范围较小,为-0.02‰~0.29‰,平均为0.18‰(n=3);Ⅳ号矿体的δ97/95Mo变化范围大,为-0.70‰~0.62‰(n=8),尤其是主矿层处的5个样品均以富集轻同位素为特征.Ⅲ号矿体与Ⅳ号矿体明显不同的Mo同位素组成可能反映了两个矿体形成于不同的成矿环境,并可能具有不同程度的后期热液改造和叠加作用.Ⅲ号矿体可能形成于一种开放的生物作用较强烈的缺氧环境,而Ⅳ号矿体形成于一种封闭或半封闭的弱氧化的局限环境.Ⅳ号矿体主成矿层位的δ97/95Mo整体偏负且具有随成矿层位的升高而增大的特点,反映了在局限环境条件下Mo同位素的分馏不同于海洋开放环境,可能存在Mo的动力学分馏效应.Ⅳ号矿体Mo同位素组成变化范围大于Ⅲ号矿体,还可能反映该矿体海底喷流沉积形成后,受到了较强的后期热液改造和叠加作用.因此,Mo同位素可以作为一种指示成矿流体以及成矿环境的有效示踪剂.

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