| 河北曲阳地区中佐伟晶岩脉中电气石原位硼同位素分析及其意义 |
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| 引用本文： | 侯江龙,王登红,李建康,王成辉,黄凡,陈振宇.河北曲阳地区中佐伟晶岩脉中电气石原位硼同位素分析及其意义[J].延边大学理工学报,2017,0(6):751-760. |
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| 作者姓名： | 侯江龙 王登红 李建康 王成辉 黄凡 陈振宇 |
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| 作者单位： | 中国地质科学院矿产资源研究所 国土资源部成矿作用与资源评价重点实验室，北京 100037 |
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| 摘 要： | 电气石在各类矿床中均有分布，常用来探讨成岩、成矿环境。鉴于不同矿床类型中电气石硼同位素的组成差别较大，硼同位素已被广泛应用于花岗岩、伟晶岩和各类热液型矿床的地球化学示踪研究中。在偏光显微镜鉴定基础上，利用激光剥蚀等离子质谱对河北曲阳地区中佐伟晶岩脉中电气石开展了原位微区硼同位素分析。结果表明:中佐伟晶岩脉中电气石硼同位素δ11B值为-10.5‰～-7.3‰，处于伟晶岩中电气石δ11B值的峰值变化区间，与加拿大马尼托巴坦科伟晶岩的δ11B值基本一致；根据电气石野外产状及显微岩相特征，粒度粗大的伟晶岩脉中电气石δ11B值明显偏负约2‰的原因在于其形成过程中岩浆脱气引发硼同位素分馏，而粒度细小的伟晶岩脉中电气石可能在硼同位素分馏前就已晶出；中佐伟晶岩脉电气石中B主要来源于岩浆-热液流体的出溶，围岩中Fe、Mg可能为电气石的形成提供了必要的物质来源。
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| 关 键 词： | 同位素地球化学 电气石 原位硼同位素 激光剥蚀等离子质谱 伟晶岩脉 同位素分馏 岩浆脱气 河北 |
In-situ Boron Isotopic Analysis and Its Geological Significance of Tourmalines from Zhongzuo Pegmatite Veins in Quyang Area of Hebei,China |
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| HOU Jiang-long,WANG Deng-hong,LI Jian-kang,WANG Cheng-hui,HUANG Fan,CHEN Zhen-yu.In-situ Boron Isotopic Analysis and Its Geological Significance of Tourmalines from Zhongzuo Pegmatite Veins in Quyang Area of Hebei,China[J].Journal of Yanbian University (Natural Science),2017,0(6):751-760. |
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| Authors: | HOU Jiang-long WANG Deng-hong LI Jian-kang WANG Cheng-hui HUANG Fan CHEN Zhen-yu |
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| Affiliation: | MLR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China |
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| Abstract: | Tourmalines are discovered in different types of deposits and are often used to investigate diagenesis and mineralization environment. For the significant isotope fractionation, the tourmalines have been widely used in geochemical tracer study of granite, pegmatite and various hydrothermal deposits. On the basis of polarizing microscope identification, the in situ boron isotopic analysis of tourmalines from Zhongzuo pegmatite veins in Quyang area of Hebei was carried out by LA-MC-ICPMS. The results show that δ11B values from Zhongzuo pegmatite veins are -10.5‰--7.3‰, which are located in the variation ranges of peak values of pegmatite; δ11B values from Zhongzuo pegmatite veins are almostly the same to Tanco pegmatites in Manitoba, Canada; according to the field and micropetrography characteristics of tourmalines, the δ11B values from pegmatite with macrograined tourmalines are lower 2‰ than those of pegmatite veins with fine-grained tourmalines, because the former is formed during magma degassing and the latter may be crystallized before boron fractionation; B of tourmaline from Zhongzuo pegmatite veins mainly derives from the exsolution of magma-hydrothermal fluid, and Fe and Mg in the surrounding rock provide necessary sources for the forming of tourmalines. |
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