| 山东济南石榴石的宝石矿物学特征及颜色环带研究 |
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| 引用本文： | 陈雨萌,余晓艳,杨溢,阮晨涛.山东济南石榴石的宝石矿物学特征及颜色环带研究[J].岩石矿物学杂志,2021,40(3):581-592. |
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| 作者姓名： | 陈雨萌 余晓艳 杨溢 阮晨涛 |
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| 作者单位： | 中国地质大学(北京) 珠宝学院, 北京 100083;中国科学院 地球化学研究所, 贵州 贵阳 550002;中国地质大学(北京) 地球科学与资源学院, 北京 100083 |
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| 基金项目： | 中国地质大学（北京）大学生创新创业训练计划项目（X201911415402）；中国地质调查项目（DD20190379） |
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| 摘 要： | 山东济南宝石级石榴石赋存于市区中基性岩体北缘,产地破坏严重,缺乏系统的宝石学资料。本文利用常规宝石学仪器、傅立叶变换红外光谱、电子探针和紫外-可见光光谱对济南石榴石进行了测试。济南石榴石的围岩是矽卡岩(较早)与伟晶岩(较晚),矽卡岩中石榴石晶体呈半自形-他形,颜色以黑色-棕红色-棕黄色为主,绿色者少,主要成分是钙铁榴石,其次为钙铝榴石;伟晶岩中石榴石晶体多为菱形十二面体,颜色以绿色、黄色为主,主要成分是钙铝榴石,其次是钙铁榴石,包裹体为针状阳起石和长石。石榴石晶体颜色环带自早到晚依次呈现黑-棕红-棕黄-黄绿-绿色。绿色环带具有异常消光,Cr含量不均匀;深绿环带Fe、Ti、Cr含量高,Y含量低,其中Cr、Fe、Ti为致色元素;黑色石榴石具有高Ti含量,并含有黑色尖晶石包裹体。济南石榴石以其中含有阳起石和尖晶石包裹体等特征区别于世界其他产地的宝石级石榴石。
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| 关 键 词： | 济南 石榴石 矿物学特征 致色元素 颜色环带 |
| 收稿时间： | 2020/6/20 0:00:00 |
A study of gemological and mineralogical characteristics and color zonation of garnets from Jinan, Shandong Province |
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| CHEN Yu-meng,YU Xiao-yan,YANG Yi,RUAN Chen-tao.A study of gemological and mineralogical characteristics and color zonation of garnets from Jinan, Shandong Province[J].Acta Petrologica Et Mineralogica,2021,40(3):581-592. |
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| Authors: | CHEN Yu-meng YU Xiao-yan YANG Yi RUAN Chen-tao |
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| Institution: | School of Gemology, China University of Geosciences (Beijing), Beijing 100083, China;Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China;School of Earth Science and Resources, China University of Geosciences (Beijing), Beijing 100083, China |
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| Abstract: | Gem-quality garnets in Jinan of Shandong Province occur on the northern margin of the middle basic rock mass in the urban area. Because of badly ruined profiles and lack of gemological reference, gemological instrument, FTIR, EPMA and UV-VIS were used to investigate the characteristics of Jinan garnets. Jinan garnet''s host rocks can be divided into early-formed skarn and late-formed pegmatite. Skarn garnet crystals are subhedral to unhedral in form, and their main component is andradite with minor grossular, mainly black-palm red or orange red and minor green in color. The pegmatite garnet''s crystals are mainly of euhedral rhombic dodecahedron shape, mainly in green or yellow color, and the component is mainly grossular with minor andradite. Inclusions of pegmatite garnets are mainly needle-like actinolite and feldspar crystal inclusions. Jinan garnet crystals can show obvious bands of black-reddish brown-yellow-yellowish green-green color from the early epoch to the late. Green garnets have the characteristics of abnormal extinction, uneven Cr content, high Fe-Ti-Cr content in dark green rims and low content of Y. Black garnets have high Ti content and contain black spinel inclusions. The spinel and actinolite inclusions in Jinan garnets are different from gem-quality garnets of other regions. |
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| Keywords: | Jinan garnets mineralogical characteristics coloring elements color zonation |
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