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    西藏错那洞电气石花岗岩中电气石化学组成、硼同位素特征及意义

    代作文 李光明 丁俊 张林奎 曹华文 张志 梁维

    代作文, 李光明, 丁俊, 张林奎, 曹华文, 张志, 梁维, 2019. 西藏错那洞电气石花岗岩中电气石化学组成、硼同位素特征及意义. 地球科学, 44(6): 1849-1859. doi: 10.3799/dqkx.2019.043
    引用本文: 代作文, 李光明, 丁俊, 张林奎, 曹华文, 张志, 梁维, 2019. 西藏错那洞电气石花岗岩中电气石化学组成、硼同位素特征及意义. 地球科学, 44(6): 1849-1859. doi: 10.3799/dqkx.2019.043
    Dai Zuowen, Li Guangming, Ding Jun, Zhang Linkui, Cao Huawen, Zhang Zhi, Liang Wei, 2019. Chemical and Boron Isotopic Composition, and Significance of Tourmaline from the Cuonadong Tourmaline Granite, Tibet. Earth Science, 44(6): 1849-1859. doi: 10.3799/dqkx.2019.043
    Citation: Dai Zuowen, Li Guangming, Ding Jun, Zhang Linkui, Cao Huawen, Zhang Zhi, Liang Wei, 2019. Chemical and Boron Isotopic Composition, and Significance of Tourmaline from the Cuonadong Tourmaline Granite, Tibet. Earth Science, 44(6): 1849-1859. doi: 10.3799/dqkx.2019.043

    西藏错那洞电气石花岗岩中电气石化学组成、硼同位素特征及意义

    doi: 10.3799/dqkx.2019.043
    基金项目: 

    扎西康铅锌-稀有资源基地深部探测与勘查示范项目 2018YFC0604103

    详细信息
      作者简介:

      代作文(1988-), 男, 博士研究生, 主要从事青藏高原地质矿产勘查评价研究

      通讯作者:

      李光明

    • 中图分类号: P597

    Chemical and Boron Isotopic Composition, and Significance of Tourmaline from the Cuonadong Tourmaline Granite, Tibet

    • 摘要: 为了对西藏错那洞电气石花岗岩源区进一步约束,利用显微镜、电子探针和激光剥蚀多接收等离子质谱仪,对错那洞电气石花岗岩中电气石的形态、成分及硼同位素组成进行了研究.结果表明,错那洞电气石花岗岩中的电气石为碱族黑/铁电气石,直接结晶自富硼熔体,与熔体之间未发生明显的硼同位素分馏.电气石δ11B值主要在-6.91‰~-9.17‰之间,与大陆地壳平均δ11B值(-10‰±3‰)相近,表明错那洞电气石花岗岩主要源自变质沉积岩的部分熔融.然而,与起源于变质沉积岩的花岗岩相比,样品的δ11B值明显偏高,而与前人报道的雅拉香波淡色花岗岩(源自石榴石角闪岩部分熔融)的δ11B值相似.因此,错那洞电气石花岗岩源区中,除了变质沉积岩外,可能还混入了少量石榴石角闪岩.

       

    • 图  1  喜马拉雅造山带简图(a)和错那洞穹隆地质图(b)

      a图据Zheng et al.(2016)修改;b图据Fu et al.(2018)梁维等(2018)修改;图 1a方框所示为雅拉香波

      Fig.  1.  Simplified geological map of Himalayan orogen (a) and geological map of the Cuonadong dome (b)

      图  2  错那洞电气石花岗岩野外露头(a)、电气石花岗岩显微照片(正交偏光)(b)和电子探针及硼同位素分析点位(c~f)

      Q.石英;Kf.钾长石;Pl.斜长石;Tm.电气石

      Fig.  2.  Outcrop of tourmaline granite from Cuonadong (a), microphotograph of tourmaline granite(crossed-polarized light) (b), and analytical spots of electron microprobe and boron isotope(c-f)

      图  3  错那洞电气石花岗岩中电气石类别划分图

      1.富Li花岗岩及相关的伟晶岩、细晶岩;2.贫Li花岗岩及相关的伟晶岩、细晶岩;3.富Fe3+石英-电气石岩(热液蚀变花岗岩);4.与Al饱和相共存的变质泥岩、变质砂岩;5.与Al饱和相不共存的变质泥岩、变质砂岩;6.富Fe3+石英-电气石岩,钙硅酸盐及变质泥岩;7.低Ca变铁镁质岩和富Cr、V变质沉积岩;8.变质碳酸盐岩和变质灰岩;9.富Ca变质泥岩,变质砂岩及钙硅酸盐;10.贫Ca变质泥岩,变质砂岩和石英-电气石岩;11.变质碳酸盐岩;12.变超铁镁质岩;据Henry and Guidotti (1985)Henry et al.(2011)

      Fig.  3.  Classification for the tourmalines of tourmaline granite from Cuonadong

      图  4  错那洞电气石花岗岩中电气石FeO/(FeO+MgO)-MgO图解

      Henry et al.(2011)

      Fig.  4.  FeO/(FeO+MgO)-MgO discriminant diagram for the tourmalines of tourmaline granite from Cuonadong

      图  5  错那洞电气石花岗岩中电气石硼同位素组成分布图

      图据Marschall and Jiang(2011);喜马拉雅淡色花岗岩中电气石硼同位素数据引自Yang et al.(2015)Gou et al.(2017)Hu et al.(2018)

      Fig.  5.  Range of boron isotopic compositions of the tourmalines of tourmaline granite from Cuonadong

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