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| 应用元素分析-电子顺磁共振能谱研究不同颜色青海软玉致色元素 | |
| 引用本文： | 于海燕,阮青锋,沙鑫,杨育富.应用元素分析-电子顺磁共振能谱研究不同颜色青海软玉致色元素[J].岩矿测试,2019,38(3):288-296. |
| 作者姓名： | 于海燕 阮青锋 沙鑫 杨育富 |
| 作者单位： | 桂林理工大学地球科学学院, 广西 桂林 541004;广西隐伏金属矿产勘查重点实验室, 广西 桂林 541004,桂林理工大学地球科学学院, 广西 桂林 541004;广西隐伏金属矿产勘查重点实验室, 广西 桂林 541004,桂林理工大学地球科学学院, 广西 桂林 541004;广西隐伏金属矿产勘查重点实验室, 广西 桂林 541004,桂林理工大学地球科学学院, 广西 桂林 541004;广西隐伏金属矿产勘查重点实验室, 广西 桂林 541004 |
| 基金项目： | 广西自然科学基金项目（2015GXNSFBA1391）；桂林理工大学博士科研启动经费（002401003554）；广西隐伏金属矿产勘查重点实验室项目 |
| 摘 要： | 颜色是软玉价值的重要体现,青海软玉颜色丰富,而致色方面的研究较为滞后。近年来青海软玉致色研究多为翠青玉和烟青玉,认为Cr~(3+)和Mn~(2+)分别为翠青玉和烟青玉致色元素。青海软玉的颜色非单一色彩,如青白色、翠绿色、灰紫色等,因此青海软玉致色应包含多种致色元素。本文在前人研究的基础上,利用X射线荧光光谱法(XRF)、化学滴定法、电感耦合等离子体质谱法(ICP-MS)和电子顺磁共振能谱(EPR)测试数据,根据分析数据与色调变化之间的关系揭示了8种颜色青海软玉的致色元素。结果表明:白玉致色元素为Fe~(3+);青白玉和碧玉致色元素为Fe~(2+)和Fe~(3+);青玉致色元素为Fe~(2+)、Fe~(3+)和高价态的Mn;翠青玉致色元素为Fe~(2+)、Fe~(3+)、Cr~(3+);黄玉和糖玉致色元素为Fe~(3+)和高价态的Mn;烟青玉致色元素为Fe~(3+)和Ti~(4+)。研究认为青海软玉中绿色调与Fe~(2+)有关,黄色调与Fe~(3+)和高价态的Mn有关,而蓝紫色调与Fe~(3+)和Ti~(4+)有关。本研究基本确定了不同颜色青海软玉的致色元素,为青海软玉致色机制的研究提供了理论依据。 |
| 关 键 词： | 青海软玉 电子顺磁 致色元素 铁 |
| 收稿时间： | 2018/5/14 0:00:00 |
| 修稿时间： | 2018/7/23 0:00:00 |
Study on Color-causing Elements in Qinghai Nephrite by Elemental Analysis and Electron Paramagnetic Resonance Spectroscopy |
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| YU Hai-yan,RUAN Qing-feng,SHA Xin and YANG Yu-fu.Study on Color-causing Elements in Qinghai Nephrite by Elemental Analysis and Electron Paramagnetic Resonance Spectroscopy[J].Rock and Mineral Analysis,2019,38(3):288-296. | |
| Authors: | YU Hai-yan RUAN Qing-feng SHA Xin and YANG Yu-fu |
| Institution: | College of Earth Sciences, Guilin University of Technology, Guilin 541004, China;Guangxi Key Laboratory of Hidden Metallic Deposits Exploration, Guilin 541004, China,College of Earth Sciences, Guilin University of Technology, Guilin 541004, China;Guangxi Key Laboratory of Hidden Metallic Deposits Exploration, Guilin 541004, China,College of Earth Sciences, Guilin University of Technology, Guilin 541004, China;Guangxi Key Laboratory of Hidden Metallic Deposits Exploration, Guilin 541004, China and College of Earth Sciences, Guilin University of Technology, Guilin 541004, China;Guangxi Key Laboratory of Hidden Metallic Deposits Exploration, Guilin 541004, China |
| Abstract: | BACKGROUND:Color is the important manifestation of nephrite value. Qinghai nephrite has different colors, but there is a lack of research on coloration. In recent years, the study on the coloration of nephrite in Qinghai mainly focused on azure-green and blue-violet, and it was considered that Cr3+ and Mn2+ were respective coloration elements of azure-green and blue-violet. The color of Qinghai nephrite is not a simple color, such as white-green, azure-green, and blue-violet. Therefore, Qinghai nephrite should contain a variety of color-causing elements. OBJECTIVES:To reveal the color-causing elements of eight colors of nephrite from Qinghai based on the relationship between analysis data and hue changes. METHODS:X-ray Fluorescence Spectrometry (XRF), Chemical Titration, Inductively Coupled Plasma-Mass Spectrometry (ICP-MS) and Electron Paramagnetic Resonance Spectroscopy (EPR) were used to study the color-causing elements of nephrite. RESULTS:The color-causing element of white Qinghai nephrite was Fe3+. The color-causing elements of white-green and azure-green Qinghai nephrite were Fe2+ and Fe3+, respectively. The chromogenic elements of green Qinghai nephrite were Fe2+, Fe3+ and Mn in high valence. The color-causing elements of azure-green Qinghai nephrite were Fe2+, Fe3+ and Cr3+. The chromogenic elements of yellow and brown Qinghai nephrite were Fe3+ and high-valence Mn. Fe3+ and Ti4+ were the color-causing elements of blue-purple Qinghai nephrite. CONCLUSIONS:This study determined the color-causing elements of different colors of Qinghai nephrite, which provided a theoretical basis for the study of the coloration mechanism of Qinghai nephrite. |
| Keywords: | Qinghai nephrite Electron Paramagnetic Resonance color-causing elements Fe |
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