新疆东天山葫芦岩体岩石学与地球化学研究

夏明哲, 姜常义, 钱壮志, 孙涛, 夏昭德, 卢荣辉. 新疆东天山葫芦岩体岩石学与地球化学研究[J]. 岩石学报, 2008, 24(12): 2749-2760.
引用本文: 夏明哲, 姜常义, 钱壮志, 孙涛, 夏昭德, 卢荣辉. 新疆东天山葫芦岩体岩石学与地球化学研究[J]. 岩石学报, 2008, 24(12): 2749-2760.
XIA MingZhe, JIANG ChangYi, QIAN ZhuangZhi, SUN Tao, XIA ZhaoDe, LU RongHui. Geochemistry and petrogenesis for Hulu intrusion in East Tianshan, Xinjiang[J]. Acta Petrologica Sinica, 2008, 24(12): 2749-2760.
Citation: XIA MingZhe, JIANG ChangYi, QIAN ZhuangZhi, SUN Tao, XIA ZhaoDe, LU RongHui. Geochemistry and petrogenesis for Hulu intrusion in East Tianshan, Xinjiang[J]. Acta Petrologica Sinica, 2008, 24(12): 2749-2760.

新疆东天山葫芦岩体岩石学与地球化学研究

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    国家自然基金重点项目(40534020)资助

Geochemistry and petrogenesis for Hulu intrusion in East Tianshan, Xinjiang

  • 葫芦岩体位于康古尔—黄山韧性剪切带东段,地表出露面积0.75km2。主要岩石类型有辉长闪长岩、辉长岩、辉石岩、辉橄岩、橄揽岩。岩相之间多呈渐变过渡关系,局部也有侵入接触。主量元素化学组成基本上属拉斑玄武岩系列。岩石相对富集LREE、适度亏损高场强元素(Nb、Ta、Ti)。岩浆演化过程中发生了较弱的同化混染作用。橄榄石、斜方辉石、单斜辉石和斜长石的分离结晶作用是岩浆演化的主要机制。四件样品εNd(t)值(+6.4~+7.1),一件样品的εSr(t)=+3.4,其余三件的εSr(t)值(-10.1~-9.3),206Pb/204Pb(18.091~18.513)、207Pb/204Pb(15.459~15.528)、208Pb/204Pb(37.526~38.126)。元素地球化学和Nd、Sr、Pb同位素体系表明,源区软流圈来源的岩浆中混入了富集岩石圈地幔来源的岩浆。稀土元素地球化学证明,熔融作用发生于尖晶石稳定域内。由此可见,岩体是尖晶石稳定域内占主体的软流圈地幔与富集岩石圈地幔相互作用的结果。
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收稿日期:  2008-05-16
修回日期:  2008-05-16
刊出日期:  2008-12-31

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