新疆北部阿尔泰南缘晚古生代高钾高硅熔结凝灰岩的地球化学、岩浆成因及构造背景

单强 牛贺才 于学元 曾乔松. 新疆北部阿尔泰南缘晚古生代高钾高硅熔结凝灰岩的地球化学、岩浆成因及构造背景[J]. 岩石学报, 2007, 23(7): 1721-1729.
引用本文: 单强 牛贺才 于学元 曾乔松. 新疆北部阿尔泰南缘晚古生代高钾高硅熔结凝灰岩的地球化学、岩浆成因及构造背景[J]. 岩石学报, 2007, 23(7): 1721-1729.
SHAN Qiang, NIU HeCai, YU XueYuan ,ZENG QiaoSong. Geochemical characteristics, magrntic genesis and tectonic background of the late paleozoic high potassium and high silicon ignimbrite on the southern margin of Altaid, north Xinjiang[J]. Acta Petrologica Sinica, 2007, 23(7): 1721-1729.
Citation: SHAN Qiang, NIU HeCai, YU XueYuan ,ZENG QiaoSong. Geochemical characteristics, magrntic genesis and tectonic background of the late paleozoic high potassium and high silicon ignimbrite on the southern margin of Altaid, north Xinjiang[J]. Acta Petrologica Sinica, 2007, 23(7): 1721-1729.

新疆北部阿尔泰南缘晚古生代高钾高硅熔结凝灰岩的地球化学、岩浆成因及构造背景

  • 基金项目:

    自然科学基金(40673036)、中科院知识创新工程重要方向项目(KZCX2-YW-107)和国家科技支撑计划项目(2006BAB07802-D3)联合资助.样品分析得到广州地球化学研究所同位素实验室的支持,裘愉卓研究员给本文提供了宝贵的意见和建议,唐红峰研究员提供部分重要的样品和资料,《岩石学报》匿名审稿人提出了建设性的修改意见,在此一并致谢.

Geochemical characteristics, magrntic genesis and tectonic background of the late paleozoic high potassium and high silicon ignimbrite on the southern margin of Altaid, north Xinjiang

  • 新疆北部阿尔泰南缘分布着一条晚古生代的火山岩带。通过岩石学和地球化学的研究,我们从克朗和麦兹火山.沉积盆地的下泥盆统康布铁堡组地层的火山岩中,厘定出一种高钾高硅熔结凝灰岩(Ignimbrite),前人称之为钾质流纹岩。高钾高硅熔结凝灰岩主要由钾长石(微斜长石)、石英和黑云母,以及少量白云母组成。其岩石化学成分的特征为过铝质的(A/CNK=1.01~1.36)、高硅(SiO2=69%~80%)、高钾(K2O=5%-11%)、高钾钠比值,并富集大离子亲石元素(Rb,Ba,K,La),亏损高场强元素(Nb,Ta,Ti,P)和低的Nb/Y比值,以及富LREE和亏损Eu的REE分布模式。以上这些特征体现它们继承了形成硅质岩浆的大陆地壳源区特点。微量元素的构造环境判别图解显示,本区高钾高硅熔结凝灰岩形成于活动大陆边缘的岛弧构造环境。综合岩石学和地球化学研究的结果,作者提出高钾高硅熔结凝灰岩岩浆的二阶段成因模型:1)地幔楔二辉橄榄岩部分熔融产生的大体积玄武岩岩浆侵入导致其上部地壳发生部分熔融形成了高硅的熔结凝灰岩岩浆;2)高硅岩浆经富钠斜长石的分离结晶作用最终形成高钾高硅的熔结凝灰岩浆。
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修回日期:  2007-03-09
刊出日期:  2007-07-31

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