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云南保山南红玛瑙矿物学特性及致色机理探究
Mineralogical characteristics and coloration mechanism of Nanhong agate from Baoshan, Yunnan Province
投稿时间:2017-01-16  修订日期:2017-04-10
中文关键词:南红玛瑙  致色矿物  赤铁矿  针铁矿  云南保山
英文关键词:Nanhong agate  colored minerals  hematite  goethite  Baoshan, Yunnan Province
基金项目:
作者单位E-mail
郭威 北京大学 地球与空间科学学院, 北京 100871  
王时麒 北京大学 地球与空间科学学院, 北京 100871;北大宝石鉴定中心, 北京 100871 pkugac@pku.edu.cn 
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中文摘要:
      通过光学显微镜、X射线粉晶衍射、X射线荧光光谱、电感耦合等离子体质谱、电子探针等测试分析手段对云南保山南红玛瑙的岩相学、矿物组成、化学成分等进行了系统研究,在此基础上进一步通过扫描电镜、X射线能谱元素面扫描、激光共聚焦显微拉曼分析了南红玛瑙致色矿物形貌、元素分布及矿物物相构成。研究结果表明,保山南红玛瑙主要矿物为石英(>95%,质量分数),主要结构为粒状结构和纤维结构,次要矿物为斜硅石及方解石等,并含有吸附水和结构水两种状态水。致色矿物主要以小于1 μm球状矿物颗粒、2~10 μm絮状似球状集合体、针状矿物颗粒和不规则形态矿物集合体这4种类型存在,元素分析显示其为含铁矿物。显微拉曼进一步确认南红玛瑙的颜色是由含铁矿物所致,其中红色致色主要为赤铁矿,黄色致色主要为针铁矿,铁矿物的具体存在形式及其分布方式对南红玛瑙的价值具有决定性作用。本工作为南红玛瑙矿物学特性以及致色机理研究提供了有价值的参考信息,对完善其知识体系和推动南红玛瑙文化有重要意义,同时对借助共聚焦显微拉曼等微区表征技术推动宝玉石研究提供了新思路。
英文摘要:
      In this paper, microscopic observation, X-ray diffraction (XRD), X-ray fluorescence (XRF), inductively coupled plasma (ICP) and electron probe micro-analyzer (EPMA) technologies were used to investigate the characteristics of petrography, mineral and chemical composition of Nanhong agates from Baoshan, Yunnan Province. Moreover, scanning electron microscopy (SEM), energy disperse spectroscopy mapping (EDS-Mapping) and laser confocal microscope Raman were used to investigate the morphologic structure, chemical component and mineral phase composition of colored minerals. The results show that Nanhong agate mainly consists of quartz (>95%) and the most common structures are fiber and granular structures. Nanhong agate has some auxiliary minerals including coesite and calcite and contains two kinds of water for adsorbed water and structure water. The colored minerals could be divided into four categories, i.e., medicine balls mineral grains with diameter less than 1 μm, flocculent globular aggregations with 2~10 μm, needle-like mineral particles and irregular shape mineral types, and all of them have iron minerals. Furthermore, micro Raman study shows that the color of Nanhong agate results from iron minerals, and goethite and hematite could bring red and yellow color respectively. The value of Nanhong agate depends on content form and distribution of iron minerals. This study not only provides useful reference information for Nanhong agate research and has important significance for completing the knowledge system and promoting Nanhong agate culture but also offers a new way for investigating gemstones by using micro Raman technology.
郭威,王时麒,2017,云南保山南红玛瑙矿物学特性及致色机理探究[J].岩石矿物学杂志,36(3):419~430.
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