中天山白石头泉岩体年代学、岩石成因及构造意义

刘四海, 吴昌志, 顾连兴, 张遵忠, 唐俊华, 黎广荣, 雷如雄, 汪传胜. 中天山白石头泉岩体年代学、岩石成因及构造意义[J]. 岩石学报, 2008, 24(12): 2720-2730.
引用本文: 刘四海, 吴昌志, 顾连兴, 张遵忠, 唐俊华, 黎广荣, 雷如雄, 汪传胜. 中天山白石头泉岩体年代学、岩石成因及构造意义[J]. 岩石学报, 2008, 24(12): 2720-2730.
LIU SiHai, WU ChangZhi, GU LianXing, ZHANG ZunZhong, TANG JunHua, LI GuangRong, LEI RuXiong, WANG ChuanSheng. Geochronology, petrogenesis and tectonic significances of the Baishitouquan pluton in Middle Tianshan, Northwest China[J]. Acta Petrologica Sinica, 2008, 24(12): 2720-2730.
Citation: LIU SiHai, WU ChangZhi, GU LianXing, ZHANG ZunZhong, TANG JunHua, LI GuangRong, LEI RuXiong, WANG ChuanSheng. Geochronology, petrogenesis and tectonic significances of the Baishitouquan pluton in Middle Tianshan, Northwest China[J]. Acta Petrologica Sinica, 2008, 24(12): 2720-2730.

中天山白石头泉岩体年代学、岩石成因及构造意义

  • 基金项目:

    国家重点基础研究发展计划项目(2007CB411301)和国家自然科学基金项目(40603008,40672040)资助

Geochronology, petrogenesis and tectonic significances of the Baishitouquan pluton in Middle Tianshan, Northwest China

  • 白石头泉岩体位于中天山北缘边界断裂(沙泉子断裂)南侧。该岩体从下至上可分为五个连续过渡的岩相带,即淡色花岗岩(a带),含天河石花岗岩(b带),天河石花岗岩(c带),含黄玉天河石花岗岩(d带)以及黄玉钠长花岗岩(e带),其中,b、c、d和e带均为a带分异的产物。白石头泉岩体的LA-ICP-MS锆石U-Pb定年结果表明,该岩体侵位于早二叠世早期(295.6±1.3Ma),并于印支期(~214Ma)经历了一次热事件的改造。淡色花岗岩在主量元素上富硅(SiO2= 74.93%~76.18%)、富碱(K2O + Na2O=8.07%~8.80%)、富钠(K2O / Na2O=0.82~0.89),贫钙、镁,而在微量元素上富Rb、F和Ga(Al/Ga比值为2217~3134),贫Ba、Sr和Eu并具强烈的铕负异常(δEu=0.0020~0.0091),反映出其源区为富含白云母的片岩(或片麻岩),成岩压力较低,温度大于860℃。结合区域地质特征,作者等认为白石头泉岩体形成于相对拉张的构造背景,是中-上地壳源岩经历高温贫水熔融的产物,其形成与幔源岩浆内侵作用有关。
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收稿日期:  2008-05-23
修回日期:  2008-09-08
刊出日期:  2008-12-31

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