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地球学报  2011 

河南新县大银尖钼矿床成岩成矿作用地球化学及地质意义

DOI: 10.3975/cagsb.2011.03.03

Keywords: 大别山,二长花岗岩,硫同位素、Sr-Nd-Pb同位素,岩石地球化学,大银尖钼矿床

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Abstract:

大银尖钼矿床产于大别变质核杂岩带北缘,为典型的与花岗侵入岩有关的石英脉-矽卡岩型复合型的岩浆热液矿床。对大银尖钼矿床开展了成矿岩体地球化学以及岩体和矿石S,Pb多元同位素联合示踪研究。结果表明,产于矿床不同部位不同类型钼矿石金属硫化物的δ34S变化很小(5.26‰~6.30%),显示规模较大、硫同位素相对均一的岩浆热液体系特征。成矿岩体显示明显较高的δ34S(+16.86‰),可能反映岩浆强烈的H2S脱挥发分作用。成矿岩体和矿石的低放射性成因铅同位素组成特征(206Pb/204Pb)t:16.876~16.732,(207Pb/204Pb)t:15.206~15.321,(208Pb/204Pb)t:37.570~37.271,和成矿岩体极低的εNd(t)(-20.1)、高(87Sr/86Sr)i(0.7237)和极高的T2DM(2.4Ga),表明成岩成矿物质形成于中下地壳古老大别杂岩的熔融作用。根据大银尖成矿岩体低Sr丰度(<50×10-6)、高Yb(1.8×10-6)较强的Eu负异常(δEu<0.5)和较低的(La/Yb)N(7.8~9.6)海鸥式稀土配分模型和最新年代学资料综合分析认为,大银尖钼矿床成岩成矿作用与大别造山带伸展减薄后正常厚度陆壳的熔融作用密切相关,是大别造山带岩石圈拆沉减薄深部动力学过程的浅表响应。

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