新疆石油地质

新疆石油地质 ›› 2011, Vol. 32 ›› Issue (6): 580-582.

• 油气勘探 • 上一篇    下一篇

准噶尔盆地中拐地区石炭-二叠系火山岩地球化学特征

孙国强1, 姚卫江2, 张顺存1, 邢承智2, 史基安1, 李兵1   

  1. 1.中国科学院油气资源研究重点实验室,兰州 730000;
    2.中国石油新疆油田分公司勘探开发研究院地球物理研究所,乌鲁木齐 830011
  • 收稿日期:2010-12-14 出版日期:2011-12-01 发布日期:2020-08-20
  • 作者简介:孙国强（1977-）,男,河南洛阳人,博士,构造地质与地球化学,（Tel）13919119923（E-mail）sguoqiang@lzb.ac.cn.
  • 基金资助:
    国家科技重大专项（2008ZX05008-003）

Geochemical Characteristics of Carboniferous-Permian Volcanic Rocks in Zhongguai Area in Northwestern Margin of Junggar Basin

SUN Guo-qiang1, YAO Wei-jiang2, ZHANG Shun-cun1, XING Cheng-zhi2, SHI Ji-an1, LI Bing1   

  1. 1. Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China;
    2. Institute of Geophysics, Research Institute of Exploration and Development, Xinjiang Oilfield Company, PetroChina, Urumqi, Xinjiang 830013, China
  • Received:2010-12-14 Online:2011-12-01 Published:2020-08-20

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摘要： 通过对准噶尔盆地西北缘中拐地区石炭-二叠系25 个火山岩岩心样品的全岩元素分析表明,研究区火山岩岩性主要为中-酸性的安山岩、英安岩、流纹岩、火山角砾岩和凝灰岩,其中SiO2的含量普遍较高,平均达到66.840%.该区石炭-二叠系火山岩是以钙性和钙碱性系列为主,其中有64%属于钙性系列,36%为钙碱系列。根据研究区火山岩的地球化学特征,判定其喷发环境应位于岛弧体系的大陆内侧,在喷发过程中经历过陆壳的熔融作用。

关键词: 准噶尔盆地, 石炭系, 二叠系, 火山岩, 构造, 地球化学

Abstract: The analyses of the whole-rock elements of 25 samples from Carboniferous-Permian volcanic rocks in Zhongguai area in northwestern margin of Junggar basin reveal that the volcanic rocks are mainly composed of intermediate-acid andesite, dacite, rhyolite, volcanic breccia and tuff, of which SiO2 content averages 66.840%, and they are dominated by calcic series and calc-alkalic series (calcic series accounts for 64% and calc-alkalic series for 36%). According to the geochemical characteristics of the volcanic rocks in this area, the volcanic eruption should occur in the continental inner side of island arc system and undergo melting process of continental crust.

Key words: Junggar basin, Carboniferous, Permian, volcanic rock, structure, geochemistry

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