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矿床地质  2012 

西藏厅宫矿区始新世斑岩的厘定及其地质意义

Keywords: 地球化学,斑状二长花岗岩,锆石U-Pb年龄,锆石Hf-O同位素,亏损地幔,厅宫铜矿

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Abstract:

厅宫铜矿的勘查工作一直是围绕英云闪长斑岩、斑状二长花岗岩等几套斑岩进行的,而未对这几期岩浆岩的年代及成因做过详细评价,并且一直认为这几套斑岩为中新世岩浆岩。笔者通过研究,发现在矿区大面积出露的斑状二长花岗岩并非中新世岩浆岩,而是始新世岩浆岩〔(48.88±0.53)Ma〕,为冈底斯岩基的重要组成部分。文章通过精确的SIMS锆石微区O同位素和LA-MC-ICPMS锆石Hf同位素分析,获得斑状二长花岗岩锆石εHf(t)值变化于4.4~8.4之间,δ18O值变化于5.81‰~6.62‰之间,显示出亏损的地球化学特征,表明该岩体可能起源于新生地壳的部分熔融或者楔形地幔部分熔融形成的岩浆发生分异结晶后的产物。通过对比研究还发现,厅宫矿区岩浆岩组合特征与矿集区内冲江、白容及岗讲矿床类似。因此,在进行找矿勘查工作部署时,应充分考虑这套斑状二长花岗岩与矿化的关系,对缩小勘查范围具有重要的现实意义。

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