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现代地质 ›› 2025, Vol. 39 ›› Issue (01): 167-182.DOI: 10.19657/j.geoscience.1000-8527.2025.005

• 宝石地质学 • 上一篇    下一篇

吉林“磐龙玉”的地球化学特征及颜色成因探讨

杨宇婷1(), 白峰1(), 温宇航1, 张启东1, 张道元1, 王雯2   

  1. 1.中国地质大学(北京)珠宝学院,北京 100083
    2.吉林省三河矿业开发有限公司,吉林 长春 130000
  • 出版日期:2025-02-10 发布日期:2025-02-20
  • 通信作者: 白 峰,男,教授,1971年出生,地质学专业,主要从事宝石学、矿物学和矿床学的教学和科研工作。Email: baifeng@cugb.edu.cn
  • 作者简介:杨宇婷,女,硕士研究生,1999年出生,地质学专业,主要从事宝石学、矿物学和矿床学方面的研究。Email: 123456yyt@email.cugb.edu.cn
  • 基金资助:
    吉林省磐龙玉分类与质量评价研究科研项目(77932020019)

Geochemical Characteristics and Color Formation Mechanisms of “Panlong Jade” from Jilin Province

YANG Yuting1(), BAI Feng1(), WEN Yuhang1, ZHANG Qidong1, ZHANG Daoyuan1, WANG Wen2   

  1. 1. School of Gemmology, China University of Geosciences (Beijing), Beijing 100083, China
    2. Jilin Sanhe Mining Exploiting Co., Ltd,Changchun, Jilin 130000, China
  • Published:2025-02-10 Online:2025-02-20

摘要:

“磐龙玉”是一种产于吉林省磐石市小红石砬子铅锌矿矿床的矿化蚀变带围岩中的石英质玉石,主要由石英和绢云母组成,多呈黄绿色。本文基于野外调查,采用常规宝石学测试、X射线粉晶衍射、红外光谱、激光拉曼光谱、紫外-可见光反射光谱、电子探针、全岩主量元素分析、全岩稀土与微量元素分析及锆石U-Pb定年等多种方法,对“磐龙玉”的宝石学特征、光谱学特征和地球化学特征进行系统研究,探讨其颜色形成机理、成矿时代及矿床成因机制。结果表明,“磐龙玉”原岩主要为流纹质凝灰岩,经硅化、绢云母化等蚀变作用使其颜色、粒度发生显著变化而达到玉石的标准。其绿色色调的致色离子为Fe2+,Fe2+的类质同象混入使得绢云母呈绿色,绢云母含量与“磐龙玉”绿色呈正相关;而Fe3+的存在则使其呈现黄色(针铁矿)和红色(赤铁矿)色调。“磐龙玉”形成于中-低温变质环境,锆石U-Pb定年结果(228.1±0.7) Ma表明其形成与该区中生代晚三叠世的酸性岩浆侵入活动关系密切,其成矿过程主要发生在气水热液期,可划分为硅化、绢云母化和碳酸盐化三个阶段。

关键词: “磐龙玉”, 石英质玉石, 光谱分析, 岩石地球化学, 锆石U-Pb定年

Abstract:

“Panlong Jade”, a type of quartzite jade, is derived from the mineralized rocks surrounding the Xiaohongshilazi lead-zinc deposit in Panshi City, Jilin Province. Mostly yellow-green, it is primarily composed of quartz and sericite minerals. Based on field investigations, this study systematically examines the gemological, spectroscopic and geochemical characteristics of “Panlong Jade” using conventional gemological testing, X-ray powder diffraction, infrared spectroscopy, laser Raman spectroscopy, whole rock geochemical principal component analysis, electron probe, ultraviolet-visible reflection spectroscopy, whole-rock rare earth and trace element analysis and zircon U-Pb dating, while exploring the color formation mechanism, age and ore genesis of “Panlong Jade”. The results indicate that the protolith of “Panlong Jade” is mainly rhyolite tuff, and its color and particle size change due to alteration processes such as silicification and sericitization to meet jade standards. The green coloration is due to the presence of Fe2+, which is isomorphic substituted in sericite, giving it a green hue. There is a positive correlation between the sericite content and the green color of “Panlong Jade”. On the other hand, the presence of Fe3+ imparts yellow (goethite) and red (hematite) hues. “Panlong Jade” formed in a medium to low-temperature metamorphic environment. Zircon U-Pb dating results (228.1±0.7) Ma suggest that the formation of “Panlong Jade” is closely related to acidic magmatic intrusion activity during the Late Triassic period of the Mesozoic era. The mineralization process of “Panlong Jade” can be divided into three main stages: silicification, sericitization, and carbonation.

Key words: “Panlong Jade”, quartzite jade, spectroscopic analysis, rock geochemistry, zircon U-Pb dating

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