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地球学报  2007 

江西岩背斑岩锡矿的成岩成矿时代及其地质意义

DOI: 10.3975/cagsb.2007.05.06

Keywords: 岩背斑岩锡矿,成岩成矿时代,江西

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Abstract:

岩背锡矿地处南武夷山西坡江西会昌县境内.该矿以富含原生黄玉为特征,是本区至今发现的唯一大型独立锡矿床.笔者对矿区内含锡花岗斑岩和成矿作用早阶段形成的石英-黄玉-锡石-硫化物脉进行了Rb-Sr同位素年代学研究,获得全岩和石英矿物Rb-Sr等时线年龄分别为(128.1±3.3)Ma(2σ,MSWD=1.07,Ir=0.7163±0.0052)和(125.5±6.1)Ma(2σ,MSWD=1.5,Ir=0.7130±0.0050),表明岩背锡矿的成岩成矿作用均发生于早白垩世晚期,其成因与中生代火山期后高位侵入的花岗斑岩密切相关.

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