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黄沙坪矿区花岗岩岩石地球化学、U-Pb年代学及Hf同位素制约

, PP. 597-606

Keywords: A型花岗岩,锆石U-Pb定年,Hf同位素示踪,黄沙坪

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Abstract:

湘南坪宝地区地处南岭中段,黄沙坪铅锌多金属矿床位于坪宝成矿带南部,304岩体是未来深部找矿的远景地区,岩石地球化学特征显示其具有A型花岗岩的特点,与区域上的千里山岩体相似。根据微量元素判别图解进一步划分为A1型,反映为非造山板内拉张背景;岩石稀土配分型式具有特征的四分组效应(tetradeffect),这是岩浆高度演化晚期熔体与流体相互作用的结果。采用LA?ICPMS方法对花斑岩中锆石进行了微区U-Pb同位素及Hf同位素测试,结果显示成岩年龄为179.9±1.3Ma(MSWD=1.9),属于燕山早期第一阶段岩浆侵入产物,成岩时代早于301岩体。Hf同位素显示地壳模式年龄为2220~2459Ma,平均为2353Ma,反映源区物质为新太古代至古元古代地壳物质。

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