郭瑞清;刘桂萍;胡雪原;梁文博;崔涛;

• 1:新疆大学地质与矿业工程学院
• 2:中国矿业大学资源与地球科学学院

摘要(Abstract)：

为厘定塔里木南缘铁克里克东段花岗闪长岩形成时代并探讨岩石成因,开展了地球化学、锆石U-Pb年代学及Hf同位素研究。LA-ICP-MS锆石U-Pb年代学的结果显示其形成于晚奥陶世(444Ma)。地球化学数据表明其具有类似于C型埃达克岩的高Sr及Sr/Y和(La/Yb)N,低Y和Yb地球化学特征,176 Hf/177 Hf和εHf(t)分别介于0.282 397～0.282 497和-3.7～+0.1之间,富含暗色微粒包体以及高Mg#,指示其具有一定的幔源岩浆印记,可能是玄武质下地壳部分熔融过程中加入一定程度幔源物质,在角闪岩-榴辉岩相条件下部分熔融形成具壳-幔混源特征的富钠、钾C型埃达克岩。结合区域地质资料认为,铁克里克岩体形成于活动大陆边缘环境,北昆仑洋于晚奥陶世仍处于俯冲环境。

关键词(KeyWords)： 铁克里克;花岗闪长岩;C型埃达克岩;晚奥陶世;活动大陆边缘

Abstract:

Keywords:

基金项目(Foundation): 中国地质调查局地质调查项目“中国主要陆块晚前寒武纪以来裂解重组过程的再造及其对成矿作用的制约”(1212011121064)专题“新疆塔里木南缘南华纪至三叠纪聚散过程研究”(212-61717)

作者(Author): 郭瑞清;刘桂萍;胡雪原;梁文博;崔涛;

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