夏金龙;黄圭成;丁丽雪;

• 1:中国地质调查局武汉地质调查中心
• 2:中国地质调查局花岗岩成岩成矿地质研究中心

摘要(Abstract)：

鄂东南地区存在大量中酸性小岩体,部分小岩体与斑岩型铜钼金矿床关系密切。对位于鄂东南东区南部的何锡铺花岗闪长斑岩体进行了锆石U-Pb定年和Hf同位素组成测定。定年结果显示:花岗闪长斑岩样品的岩浆结晶年龄为(142±1)Ma,属早白垩世。这与鄂东南地区和九江-瑞昌地区含矿小岩体形成年代基本一致。何锡铺岩体锆石176 Hf/177 Hf比值为0.282 372~0.282 656,在t=142 Ma时,对应的εHf(t)值为-11.1~-1.1,平均值为-6.3。锆石εHf(t)值具不均一性,类似于阮宜湾岩体,而不同于铜山口岩体和龙角山岩体。岩体具高Sr/Y比值,无明显Eu负异常。全岩初始锶同位素比值(87Sr/86Sr)i为0.705 88,εNd(t)值为-4.9。全岩地球化学、Sr-Nd同位素和锆石Hf同位素特征一致表明富集地幔是何锡铺岩体的重要源区,原始幔源岩浆可能存在古老地壳物质的混染。何锡铺岩体不仅具有与铜山口岩体类似的岩石学特征,还具有与其类似的地球化学特征。幔源物质的参与指示该岩体具有形成斑岩型铜钼金矿床的潜力。

关键词(KeyWords)： 锆石U-Pb年龄;Hf同位素;岩浆源区;花岗闪长斑岩;鄂东南

Abstract:

Keywords:

基金项目(Foundation): 中国地质调查局地质调查项目(1212011120863;12120114039401;121201009000150002)

作者(Author): 夏金龙;黄圭成;丁丽雪;

Email:

DOI: 10.19509/j.cnki.dzkq.2017.0611

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