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西南天山柯坪地区萨尔干基性岩脉U-Pb年代学及地球化学特征

霍海龙 陈正乐 陈贵民 张青 韩凤彬 张文高

霍海龙, 陈正乐, 陈贵民, 等, 2019. 西南天山柯坪地区萨尔干基性岩脉U-Pb年代学及地球化学特征. 地质力学学报, 25 (S1): 60-65. DOI: 10.12090/j.issn.1006-6616.2019.25.S1.011
引用本文: 霍海龙, 陈正乐, 陈贵民, 等, 2019. 西南天山柯坪地区萨尔干基性岩脉U-Pb年代学及地球化学特征. 地质力学学报, 25 (S1): 60-65. DOI: 10.12090/j.issn.1006-6616.2019.25.S1.011
HUO Hailong, CHEN Zhengle, CHEN Guimin, et al., 2019. THE U-PB GEOCHRONOLOGY AND GEOCHEMICAL CHARACTERISTICS OF THE SAERGAN MAFIC ROCKS IN THE KEPING AREA, SOUTHWEST TIANSHAN, CHINA. Journal of Geomechanics, 25 (S1): 60-65. DOI: 10.12090/j.issn.1006-6616.2019.25.S1.011
Citation: HUO Hailong, CHEN Zhengle, CHEN Guimin, et al., 2019. THE U-PB GEOCHRONOLOGY AND GEOCHEMICAL CHARACTERISTICS OF THE SAERGAN MAFIC ROCKS IN THE KEPING AREA, SOUTHWEST TIANSHAN, CHINA. Journal of Geomechanics, 25 (S1): 60-65. DOI: 10.12090/j.issn.1006-6616.2019.25.S1.011

西南天山柯坪地区萨尔干基性岩脉U-Pb年代学及地球化学特征

doi: 10.12090/j.issn.1006-6616.2019.25.S1.011
基金项目: 

国家自然科学基金项目 U1403292

国家自然科学基金项目 41502085

国家自然科学基金项目 41472196

国家科技支撑计划项目 2015BAB05B04

详细信息
    作者简介:

    霍海龙(1988-), 男, 在读博士, 构造地质学专业, 主要从事区域构造研究。E-mail:huohailong2012@163.com

    通讯作者:

    陈正乐(1967-), 男, 博士, 研究员, 主要从事区域构造、矿田构造研究。E-mail:chenzhengle@263.net

  • 中图分类号: P588.124;P597.3

THE U-PB GEOCHRONOLOGY AND GEOCHEMICAL CHARACTERISTICS OF THE SAERGAN MAFIC ROCKS IN THE KEPING AREA, SOUTHWEST TIANSHAN, CHINA

  • 摘要: 柯坪地区发育一套沿走滑断层侵位的萨尔干基性岩脉,其产出于西南天山造山带与塔里木克拉通的接触部位,具有重要的意义。文章通过对萨尔干基性岩脉样品进行锆石LA-ICP-MS U-Pb年代学、岩石地球化学分析,探讨西南天山中新生代陆内造山作用过程。结果表明,萨尔干基性岩脉的LA-ICP-MS锆石U-Pb年龄为(49.14±0.8)Ma,表明该套岩石形成于始新世。地球化学表明该套岩石形成于与青藏高原碰撞远程效应相关的构造背景。

     

  • 图  1  西南天山造山带地质图

    1—新生代地层;2—中生代地层;3—古生代地层;4—前寒武纪地层;5—蛇绿混杂岩;6—超基性-基性侵入岩;7—花岗岩;8—湖泊;9—冰川;10—断层;
    ①—扎拉依尔—奈曼缝合带;②—尼古拉耶夫线—那拉提北缝合带;③—南中天山缝合带;④—塔里木北缘断裂带; ⑤—塔拉斯—费尔干纳走滑断裂带;
    KNTS—吉尔吉斯斯坦北天山;YB—伊犁地块;TB—塔里木陆块;CTA—中天山复合弧地体;STOB—西南天山造山带a—中亚造山带构造简图;b—西南天山及其邻区地质图[1-3]

    Figure  1.  Tectonic sketch map of the southwest Tianshan orogen

    图  2  萨尔干地区地质简图

    (星号为采样位置)

    Figure  2.  Simplified structural map of the Saergan area

    (The asterisk is the sampling location)

    图  3  萨尔干基性岩脉岩石判别图解[11]

    a—岩石分类判别(TAS)图解;b—A/CNK-A/NK图解;c—logσ-logτ图解

    Figure  3.  The rock identification diagram of the Saergan mafic rocks[11]

    图  4  萨尔干基性岩脉稀土球粒陨石标准化和微量元素洋中脊玄武岩标准化图解[12]

    a—基性岩脉的稀土元素球粒陨石配分曲线图;b—基性岩脉微量元素N-型洋中脊玄武岩标准化图解

    Figure  4.  The chondrite-normalized REE and N-MORB-normalized trace-element spider patterns of the Saergan mafic rocks[12]

    图  5  萨尔干基性岩脉锆石CL图像及锆石U-Pb同位素谐和与加权平均年龄图

    Figure  5.  CL images, and U-Pb concordia diagram for zircon samples of the Saergan mafic rocks.

    图  6  萨尔干基性岩脉构造判别图解[16]

    Figure  6.  Various tectonic discrimination diagrams of the Saergan mafic rocks[16]

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  • 刊出日期:  2019-05-01

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