【引用本文】 乔鑫, 周征宇, 农佩臻, 等. 贫碱结构水类型祖母绿红外光谱特征及其控制因素探究[J]. 岩矿测试, 2019, 38(2): 169-178. doi: 10.15898/j.cnki.11-2131/td.201804070039
QIAO Xin , ZHOU Zheng-yu , NONG Pei-zhen , et al. Study of the Infrared Spectral Characteristics of H2O Ⅰ-type Emerald and the Controlling Factors[J]. Rock and Mineral Analysis, 2019, 38(2): 169-178. doi: 10.15898/j.cnki.11-2131/td.201804070039

贫碱结构水类型祖母绿红外光谱特征及其控制因素探究

1. 同济大学海洋与地球科学学院, 上海 200092;

2. 上海宝石及材料工艺工程技术研究中心, 上海 200070;

3. 同济大学宝石及工艺材料实验室, 上海 200092

收稿日期: 2018-04-07  修回日期: 2018-11-23 

基金项目: 国家自然科学基金项目(41272049);上海市科委科研计划项目(15DZ2283200,12DZ2251100)

作者简介: 乔鑫,硕士研究生,地质学专业宝石矿物方向。E-mail:1187507313@qq.com。。

通信作者:

Study of the Infrared Spectral Characteristics of H2O Ⅰ-type Emerald and the Controlling Factors

1. School of Ocean & Earth Science, Tongji University, Shanghai 200092, China;

2. Shanghai Engineering Research Center of Gems & Technological Materials, Shanghai 200070, China;

3. Laboratory of Gem and Technological Materials, Tongji University, Shanghai 200092, China

Corresponding author: ZHOU Zheng-yu , 主要从事岩石矿物学及光谱学分析研究。06058@tongji.edu.cn。

Received Date: 2018-04-07
Revised Date: 2018-11-23

摘要:祖母绿红外吸收主要与其硅氧骨干、通道内结构水、相关碱性金属离子和大分子振动有关。国内外相关研究主要集中在峰位归属及谱峰特征对比方面,认为与分子振动和不同类型结构水相关,对更深层的成矿或化学控制因素的研究还较少。本文选取典型4个矿区样品,针对贫碱结构水(Ⅰ型)特征为主的祖母绿进行了近、中红外光谱测定,在此基础上初步探讨其主要控制因素。结果表明:同为Ⅰ型水主控的不同矿区祖母绿呈现一致特征,若干与结构水、碱性离子及大分子相关吸收具有稳定峰位、近似的相对峰强和峰形的特征。分析发现:祖母绿红外谱带特征直接受控于通道中结构水的占位方向和比例,进一步与祖母绿成矿Al3+的类质同象替换相关,主要受(Mg2++Fe2+)离子浓度影响,当其浓度较低时,类质同象替换程度较低,祖母绿结构水占位主要表现为Ⅰ型水特征,其相关元素特征表现为高Si、Al,低Mg、Fe,总体贫碱,对应相应典型红外特征,指示化学离子浓度与红外谱学特征之间的关系。研究过程表明红外光谱可以辅助对Ⅰ型水祖母绿产地的鉴定和成矿环境的认知。

关键词: 祖母绿, 红外光谱, Ⅰ型水, 类质同象替换, (Mg2++Fe2+)离子浓度

Study of the Infrared Spectral Characteristics of H2O Ⅰ-type Emerald and the Controlling Factors

KEY WORDS: emerald, Infrared Spectrometry, typeⅠstructure water, isomorphic substitution, (Mg2+ + Fe2+) cations concentration

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贫碱结构水类型祖母绿红外光谱特征及其控制因素探究

乔鑫, 周征宇, 农佩臻, 赖萌, 李英搏, 郭恺鹏, 钟倩, 王含, 周彦