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川西松林口岩体锆石U-Pb定年及其地球化学特征

叶亚康

叶亚康, 2019. 川西松林口岩体锆石U-Pb定年及其地球化学特征. 地质力学学报, 25 (S1): 53-59. DOI: 10.12090/j.issn.1006-6616.2019.25.S1.010
引用本文: 叶亚康, 2019. 川西松林口岩体锆石U-Pb定年及其地球化学特征. 地质力学学报, 25 (S1): 53-59. DOI: 10.12090/j.issn.1006-6616.2019.25.S1.010
YE Yakang, 2019. ZIRCON U-PB DATING AND GEOCHEMICAL CHARACTERISTICS OF THE SONGLINKOU PLUTON, WESTERN SICHUAN. Journal of Geomechanics, 25 (S1): 53-59. DOI: 10.12090/j.issn.1006-6616.2019.25.S1.010
Citation: YE Yakang, 2019. ZIRCON U-PB DATING AND GEOCHEMICAL CHARACTERISTICS OF THE SONGLINKOU PLUTON, WESTERN SICHUAN. Journal of Geomechanics, 25 (S1): 53-59. DOI: 10.12090/j.issn.1006-6616.2019.25.S1.010

川西松林口岩体锆石U-Pb定年及其地球化学特征

doi: 10.12090/j.issn.1006-6616.2019.25.S1.010
基金项目: 

中国地质调查局地质调查项目"川西稀有金属矿集区综合地质调查" DD20160074

详细信息
    作者简介:

    叶亚康(1992-), 男, 在读硕士, 矿物学、岩石学、矿床学专业。E-mail:ye18608004874@sina.com

  • 中图分类号: P597.3

ZIRCON U-PB DATING AND GEOCHEMICAL CHARACTERISTICS OF THE SONGLINKOU PLUTON, WESTERN SICHUAN

  • 摘要: 松林口岩体位于松潘—甘孜造山带中东部,为确定岩体的侵位时代和地球化学特征,通过镜下薄片观察、主微量元素分析以及锆石U-Pb测年,对松林口岩体进行了研究。结果表明,松林口岩体由二长花岗岩体和花岗闪长岩体组成,花岗闪长岩锆石206Pb/238U年龄加权平均值为(212.4±0.9)Ma(MSWD=0.66),二长花岗岩锆石206Pb/238U年龄加权平均值为(222.4±1.1)Ma(MSWD=0.39),形成于晚三叠世,由两期次岩浆作用形成;岩石的SiO2含量56.56%~61.97%;铝饱和指数A/CNK=0.93~1.05,全碱含量3.78~5.38,K2O/Na2O=1.02~1.68,里特曼指数σ=1.194~1.612,样品属于准铝质中—高钾钙碱性岩系列。岩石轻重稀土比值LREE/HREE=5.22~7.13,LaN/YbN比值为6.93~8.96,轻、重稀土分异较明显,具较强的负Eu异常。岩石Mg#值较高(50.97~61.27),w(Rb)/w(Sr)为0.12~0.25,Rb-(Y+Nb)图解显示为后碰撞环境。因此,松林口二长花岗岩—花岗闪长岩属后碰撞准铝质中—高钾钙碱性Ⅰ型花岗岩类。

     

  • 图  1  松林口岩体手标本及镜下特征

    Bt—黑云母;Hbl—普通角闪石;Qtz—石英;Pl—斜长石;Aug—普通辉石a—花岗闪长岩;b—花岗闪长岩镜下照片,正交偏光;c—二长花岗岩;d—二长花岗岩镜下照片,正交偏光

    Figure  1.  Specimens and microscopic characteristics of the Songlinkou pluton

    图  2  年龄频数分布

    Figure  2.  Frequency distribution of age

    图  3  锆石谐和图、加权平均年龄

    Figure  3.  Ziron U-Pb concordia diagram and weighted mean age

    图  4  二长花岗岩体锆石U-Pb谐和图和加权平均年龄

    Figure  4.  Ziron U-Pb concordia diagram and weighted mean age of monzonitic granite

    图  5  岩体SiO2-K2O图解

    Figure  5.  SiO2-K2O diagram of the Songlinkou pluton

    图  6  岩体A/NK-A/CNK图解

    Figure  6.  A/NK-A/CNK diagram of the Songlinkou pluton

    图  7  松林口岩体构造环境判别图解

    Figure  7.  Tectonic environment discrimination diagram of the Songlinkou pluton

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  • 刊出日期:  2019-05-01

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