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内蒙古赤峰北部下二叠统于家北沟组碎屑沉积岩地球化学特征

郭伟 杨欣德 张娟 郝彬

郭伟, 杨欣德, 张娟, 等, 2011. 内蒙古赤峰北部下二叠统于家北沟组碎屑沉积岩地球化学特征. 地质力学学报, 17 (3): 295-302.
引用本文: 郭伟, 杨欣德, 张娟, 等, 2011. 内蒙古赤峰北部下二叠统于家北沟组碎屑沉积岩地球化学特征. 地质力学学报, 17 (3): 295-302.
GUO Wei, YANG Xinde, ZHANG Juan, et al., 2011. GEOCHEMICAL CHARACTERISTICS OF CLASTIC SEDIMENTARY ROCKS FROM LOWER PERMIAN YUJIABEIGOU FORMATION IN NORTHERN CHIFENG, INNER MONGOLIA. Journal of Geomechanics, 17 (3): 295-302.
Citation: GUO Wei, YANG Xinde, ZHANG Juan, et al., 2011. GEOCHEMICAL CHARACTERISTICS OF CLASTIC SEDIMENTARY ROCKS FROM LOWER PERMIAN YUJIABEIGOU FORMATION IN NORTHERN CHIFENG, INNER MONGOLIA. Journal of Geomechanics, 17 (3): 295-302.

内蒙古赤峰北部下二叠统于家北沟组碎屑沉积岩地球化学特征

基金项目: 本文由中国地质调查局“内蒙古1:50000炒米房幅(K50E006017),土城子幅(K50E006018),新开地幅(K50E007017),大黑水幅(K50E007018)区调”项目资助
详细信息
    作者简介:

    郭伟(1985-),男,中国地质大学(北京)在读硕士,矿物学、岩石学、矿床学专业。E-mail:hamo9527@163.com

  • 中图分类号: P595

GEOCHEMICAL CHARACTERISTICS OF CLASTIC SEDIMENTARY ROCKS FROM LOWER PERMIAN YUJIABEIGOU FORMATION IN NORTHERN CHIFENG, INNER MONGOLIA

  • 摘要: 内蒙古赤峰北部下二叠统于家北沟组碎屑沉积岩主要分布于华北克拉通北缘的内蒙古隆起。碎屑沉积岩主要以杂砂岩为主, 源区岩石没有经过充分的搬运、分选, 成熟度比较低。常量及稀土元素分析结果显示, 轻重稀土元素分异明显, 轻稀土元素富集, 重稀土元素含量稳定, δEu的值在0.72~0.99之间, 表现出一定的负Eu异常, 与NASC或PAAS配分模式相似, 说明物源来自于上地壳。结合前人的研究成果, 认为其母岩原岩可能以沉积岩和花岗岩为主, 或有少量的玄武岩; 物源区大地构造背景为活动大陆边缘或者大陆岛弧, 说明研究区在早二叠世或更早处于西伯利亚板块与华北克拉通缝合阶段。

     

  • 图  1  研究区于家北沟组分布示意图

    Figure  1.  Distribution of Yujiabeigou formation in the studied area

    图  2  于家北沟组碎屑沉积岩物源分析图解

    Figure  2.  Source analysis diagram of clastic sedimentary rocks from Lower Permian Yujiabeigou Formation

    图  3  于家北沟组碎屑沉积岩构造环境判别图

    Figure  3.  Tectonic environment diagram of clastic sedimentary rocks from Lower Permian Yujiabeigou Formation

    图  4  于家北沟组碎屑沉积岩大地构造背景判别图

    Figure  4.  Geotectonic background diagram of clastic sedimentary rocks from Lower Permian Yujiabeigou formation

    图  5  于家北沟组碎屑沉积岩球粒陨石标准化后的稀土元素配分模式

    Figure  5.  Partition models of rare earth elements after chondrite standardization

    图  6  于家北沟组碎屑沉积岩NASC标准化后的稀土元素配分模式

    Figure  6.  Partition models of rare earth elements after NASC standardization

    表  1  内蒙古北部下二叠统于家北沟组碎屑沉积岩常量元素分析结果

    Table  1.   Constant elements values of clastic sedimentary rocks from Lower Permian Yujiabeigou formation in northern Chifeng, Inner Mongolia

    表  2  内蒙古北部下二叠统于家北沟组碎屑沉积岩稀土元素测试结果

    Table  2.   Rare earth elements values of clastic sedimentary rocks from Lower Permian Yujiabeigou Formation in northern Chifeng, Inner Mongolia

    表  3  内蒙古北部下二叠统于家北沟组碎屑沉积岩稀土元素统计分析

    Table  3.   Rare earth elements statistical values of clastic sedimentary rocks from Lower Permian Yujiabeigou Formation in northern Chifeng, Inner Mongolia

    表  4  不同大地构造背景的沉积盆地中杂砂岩稀土元素特征[19]

    Table  4.   Characteristics of rare earth elements of greywacke in different sedimentary basins

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  • 收稿日期:  2011-04-28
  • 刊出日期:  2011-09-28

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