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应用激光拉曼光谱鉴别桂中铝土矿TiO2同质异象矿物

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张永清, 周红英, 耿建珍, 肖志斌, 涂家润, 张然, 叶丽娟. 应用激光拉曼光谱鉴别桂中铝土矿TiO2同质异象矿物[J]. 岩矿测试, 2022, 41(6): 978-986. doi: 10.15898/j.cnki.11-2131/td.202112070196
引用本文: 张永清, 周红英, 耿建珍, 肖志斌, 涂家润, 张然, 叶丽娟. 应用激光拉曼光谱鉴别桂中铝土矿TiO2同质异象矿物[J]. 岩矿测试, 2022, 41(6): 978-986. doi: 10.15898/j.cnki.11-2131/td.202112070196
shu
ZHANG Yongqing, ZHOU Hongying, GENG Jianzhen, XIAO Zhibin, TU Jiarun, ZHANG Ran, YE Lijuan. Identification of TiO2 Polymorphs of the Bauxite Deposit in Central Guangxi by Laser Raman Spectroscopy[J]. Rock and Mineral Analysis, 2022, 41(6): 978-986. doi: 10.15898/j.cnki.11-2131/td.202112070196
Citation: ZHANG Yongqing, ZHOU Hongying, GENG Jianzhen, XIAO Zhibin, TU Jiarun, ZHANG Ran, YE Lijuan. Identification of TiO2 Polymorphs of the Bauxite Deposit in Central Guangxi by Laser Raman Spectroscopy[J]. Rock and Mineral Analysis, 2022, 41(6): 978-986. doi: 10.15898/j.cnki.11-2131/td.202112070196
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应用激光拉曼光谱鉴别桂中铝土矿TiO2同质异象矿物

  • 中国地质调查局天津地质调查中心，天津 300170

  • 基金项目:
    国家自然科学基金青年基金项目(41803047)
详细信息
    作者简介: 张永清，硕士，高级工程师，地球化学专业，从事同位素地球化学和地质年代学研究。E-mail: zhangyq823@163.com

  • 中图分类号: P575.1

Identification of TiO2 Polymorphs of the Bauxite Deposit in Central Guangxi by Laser Raman Spectroscopy

  • Tianjin Center, China Geological Survey, Tianjin 300170, China

    摘要

  • 金红石、锐钛矿和板钛矿为TiO2的三种同质异象矿物。在进行金红石微区原位U-Pb定年时，通常主要依据电子探针数据、辅以阴极发光图像确定研究矿物为金红石，而电子探针数据和阴极发光图像有时并不能有效地区分金红石、锐钛矿和板钛矿，若用于进行定年的矿物中同时存在三种或其中两种TiO2矿物，获得的年龄可能是混合年龄，无显著地质意义。因此，对TiO2同质异象矿物的快速准确鉴别具有重要意义。本文以桂中铝土矿中TiO2矿物为研究对象，将激光拉曼光谱应用于TiO2同质异象矿物的鉴别，准确识别出桂中铝土矿TiO2矿物中存在四组不同特征的激光拉曼光谱谱线。前三组分别具有锐钛矿、金红石和板钛矿的激光拉曼光谱特征峰；第四组具有两种激光拉曼光谱特征谱线，第一种同时具有锐钛矿的特征峰144、198、397、513、636cm-1和金红石的特征峰442、607cm-1，第二种同时具有锐钛矿的特征峰144cm-1和板钛矿特征峰153、247、325、636cm-1。结果表明：桂中铝土矿TiO2矿物中除金红石、锐钛矿和板钛矿外，还存在同时具有两种矿物结构特征的中间矿物。分析认为研究区可能经历了后期的区域变质作用，导致TiO2同质异象矿物发生相变，这类中间矿物则记录了相变的过程。本文应用激光拉曼光谱快速准确地鉴别出桂中铝土矿TiO2同质异象矿物，为金红石微区原位U-Pb定年研究中矿物的鉴别提供了新思路。

    BACKGROUND

    Rutile, anatase and brookite are TiO2 polymorphs. In the rutile in-situ U-Pb dating, rutile was determined primarily on electron microprobe data and cathodoluminescence images, while these methods sometimes could not effectively distinguish rutile, anatase and brookite. If there are a small number of the TiO2 polymorphs in the sample, the obtained age may be a mixed age with no significant geological significance. Therefore, the identification of TiO2 polymorphs is very important.

     OBJECTIVES

    To identify TiO2 polymorphs from the bauxite deposit in central Guangxi.

     METHODS

    TiO2 minerals in bauxite from central Guangxi were used as the research object, and laser Raman spectroscopy was applied to the identification of TiO2 isomorphic minerals.

     RESULTS

    Four groups of laser Raman spectral lines with different characteristics were identified. The first three groups have laser Raman spectral peaks of anatase, rutile and brookite, respectively. The fourth group has two kinds of laser Raman spectral characteristic lines, one has both anatase characteristic peaks of 144, 198, 397, 513, 636cm-1 and rutile characteristic peaks of 442, 607cm-1, the other has both anatase characteristic peak of 144cm-1 and brookite characteristic peak of 153, 247, 325, 636cm-1.

     CONCLUSIONS

    The TiO2 polymorphs of the bauxite deposit includs rutile, anatase, brookite and intermediate minerals that undergo phase transformation. The study indicates that the bauxite deposit in central Guangxi may have undergone a later regional metamorphism, leading to the transformation of TiO2 polymorphs. The laser Raman spectroscopy provides a new method for the identification of TiO2 polymorphs andrutile for in-situ U-Pb dating.
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  • 图 1  金红石、锐钛矿和板钛矿的晶体结构示意图

    Figure 1. 

    下载: 全尺寸图片 幻灯片

    图 2  桂中铝土矿中锐钛矿、金红石及板钛矿激光拉曼光谱图(锐钛矿、金红石及板钛矿激光拉曼光谱标准曲线据Meinhold, 2010[27])

    Figure 2. 

    下载: 全尺寸图片 幻灯片

    图 3  桂中铝土矿第四组TiO2矿物激光拉曼光谱图(锐钛矿、金红石及板钛矿激光拉曼光谱标准曲线据Meinhold, 2010[27])

    Figure 3. 

    下载: 全尺寸图片 幻灯片

    图 4  桂中铝土矿TiO2同质异象矿物透射光及阴极发光图像

    Figure 4. 

    下载: 全尺寸图片 幻灯片

    表 1  桂中铝土矿TiO2同质异象矿物电子探针分析结果

    Table 1.  Electron microprobe analyses of TiO2 polymorphs from the bauxite deposit in central Guangxi

    测点 锐钛矿(%)
    K2O UO2 CaO TiO2 Na2O MgO Al2O3 SiO2 Cr2O3 MnO FeO ThO2 PbO Nb2O5 P2O5 Ta2O5 总计
    1 0.02 0.08 0.10 98.84 0.03 0.00 0.21 0.31 0.00 0.02 0.18 0.01 0.00 0.27 0.00 0.14 100.20
    2 0.00 0.00 0.08 98.55 0.01 0.00 0.09 0.22 0.00 0.02 0.14 0.02 0.00 0.14 0.00 0.01 99.28
    3 0.01 0.02 0.02 98.07 0.00 0.01 0.81 0.10 0.00 0.00 0.09 0.00 0.00 0.15 0.00 0.00 99.27
    4 0.01 0.00 0.05 98.66 0.03 0.00 0.04 0.17 0.01 0.01 0.15 0.02 0.00 0.18 0.00 0.00 99.35
    5 0.01 0.00 0.03 99.39 0.00 0.00 0.05 0.02 0.02 0.00 0.04 0.00 0.01 0.15 0.00 0.03 99.74
    6 0.00 0.02 0.09 99.48 0.00 0.00 0.02 0.01 0.05 0.00 0.15 0.00 0.00 0.23 0.01 0.11 100.20
    测点 金红石(%)
    K2O UO2 CaO TiO2 Na2O MgO Al2O3 SiO2 Cr2O3 MnO FeO ThO2 PbO Nb2O5 P2O5 Ta2O5 总计
    1 0.00 0.09 0.00 97.57 0.01 0.01 0.15 0.21 0.06 0.00 0.61 0.05 0.00 0.16 0.00 0.04 98.96
    2 0.00 0.00 0.01 98.18 0.00 0.00 0.18 0.10 0.03 0.01 0.42 0.00 0.00 0.25 0.00 0.00 99.17
    3 0.23 0.00 0.04 97.76 0.00 0.07 0.66 1.09 0.03 0.01 0.19 0.04 0.00 0.18 0.00 0.00 100.30
    4 0.02 0.05 0.01 99.15 0.00 0.00 0.01 0.00 0.04 0.00 0.21 0.01 0.00 0.07 0.00 0.09 99.66
    5 0.00 0.00 0.01 99.22 0.01 0.00 0.03 0.02 0.00 0.00 0.48 0.01 0.00 0.02 0.00 0.00 99.80
    6 0.02 0.02 0.00 98.17 0.00 0.01 0.05 0.00 0.15 0.00 0.58 0.05 0.00 0.99 0.01 0.09 100.10
    测点 板钛矿(%)
    K2O UO2 CaO TiO2 Na2O MgO Al2O3 SiO2 Cr2O3 MnO FeO ThO2 PbO Nb2O5 P2O5 Ta2O5 总计
    1 0.00 0.00 0.00 98.40 0.00 0.00 0.05 0.01 0.04 0.01 0.16 0.00 0.00 0.91 0.02 0.07 99.67
    2 0.00 0.00 0.04 98.48 0.00 0.02 0.03 0.04 0.00 0.00 0.29 0.00 0.01 0.58 0.00 0.08 99.55
    3 0.00 0.04 0.01 99.82 0.03 0.00 0.03 0.00 0.03 0.00 0.09 0.01 0.00 0.09 0.00 0.00 100.10
    测点 第四组矿物(%)
    K2O UO2 CaO TiO2 Na2O MgO Al2O3 SiO2 Cr2O3 MnO FeO ThO2 PbO Nb2O5 P2O5 Ta2O5 总计
    1 0.01 0.00 0.03 99.97 0.00 0.00 0.03 0.00 0.16 0.00 0.17 0.00 0.00 0.00 0.00 0.00 100.40
    2 0.00 0.00 0.12 98.16 0.02 0.02 0.28 0.50 0.00 0.04 0.18 0.00 0.00 0.41 0.00 0.00 99.70
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收稿日期:  2021-12-07
修回日期:  2022-02-22
录用日期:  2022-03-13
刊出日期:  2022-11-28

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