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高品质危地马拉绿色翡翠岩石矿物学特征及其产地标型
Petromineralogy and typomorphic characteristics of high-quality Guatemalan green jadeite jade
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| DOI | 10.20086/j.cnki.yskw.2025.4122 |
| 刊名 |
Acta Petrologica et Mineralogica
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| 年，卷(期) | 2025, 44(4) |
| 作者 |
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| 作者单位 |
1. 中山大学地球科学与工程学院, 南方海洋科学与工程广东省实验室(珠海), 广东 珠海 519082; |
| 摘要 |
危地马拉新发现的高品质绿色翡翠的品质可与缅甸高端绿色翡翠媲美,逐渐成为国内珠宝市场重要的高品质绿色翡翠首饰主要材料来源,但业内对其岩石矿物学特征及产地标型的研究仍较为薄弱。选取中国市场上已大量出现的高品质危地马拉绿色翡翠及成品为研究对象,通过显微观察、激光拉曼光谱、电子探针等测试手段,对其矿物组合和成分特征进行了系统分析。结果表明“玛雅绿”翡翠主要由绿辉石矿物组成,次要矿物包括金云母、多硅白云母、黝帘石等。绿辉石分为Omp-Ⅰ、Omp-Ⅱ、Omp-Ⅲ这3个不同的形成期次,其中Omp-Ⅲ为该翡翠的主体矿物,其成分具有低Mg(平均7.59%)和Fe(平均1.57%)、高Cr(平均0.24%)、端员硬玉组分Xjd>0.5(平均0.53)等特点。现有研究显示,危地马拉莫塔瓜断层带不同区段的翡翠有各具特色的矿物组合,但本文研究的国内市场上高品质危地马拉绿色翡翠成品的矿物较为单一,主要由较纯的绿辉石所组成,可含有辉铜矿和红砷镍矿两种特殊的金属矿物包体,端员组分和矿物成分特征与其他产地的高绿翡翠具有较为明显的不同,可以为有效区分高品质危地马拉绿色翡翠和缅甸传统绿色翡翠以及其他产地高品质绿色翡翠提供岩石矿物学标型的重要特征参考。
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| Abstract |
The newly discovered high-quality green jadeite in Guatemala is comparable to the high-end green jadeite from Myanmar, gradually becoming an important source of high-quality green jadeite jewelry materials in the domestic jewelry market. However, research on its petromineralogy and typomorphic characteristics remains relatively weak. This study selects a large number of Guatemalan high-quality green jadeite materials and jewelry that have appeared in the Chinese market as research subjects. Through microscopic observation, laser Raman spectroscopy, EMPA, and other testing methods, a systematic analysis of their mineral assemblages and compositional characteristics was conducted. The research findings indicate that the high-quality Guatemalan green "Mayan Green" jadeite materials appearing in the market are primarily composed of omphacite minerals, with secondary minerals including phlogopite, phengite, zoisite. Omphacite can be classified into three different formation stages, Omp-Ⅰ, II, and III, based on its mineral assemblages and their interrelationships. Among them, the high-quality Guatemalan green jadeite jewelry are mainly composed of omphacite formed in the Omp-Ⅲ stage, characterized by relatively low Mg (average 7.59%) and Fe (average 1.57%) contents, relatively high Cr content (average 0.24%), and a jadeite component Xjd>0.5 (average 0.53). Existing research indicates that the jadeites in different segments of the Motagua Fault System in Guatemala possess distinct mineral assemblages. However, the high-quality green jadeite jewellerys studied in this paper exhibit a relatively uniform mineral composition in the domestic market, primarily composed of pure omphacite. They may contain two specific metal mineral inclusions, chalcocite and nickeline. The endmember composition and mineralogical characteristics show significant differences compared to other sources of high-quality green jadeite, enabling effective differentiation between high-quality Guatemalan green jadeite, traditional Myanmar green jadeite, and high-quality green jadeite from other origins by providing essential reference characteristics in petrology and mineralogy.
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| 关键词 |
翡翠；绿辉石；岩石矿物学；产地标型；危地马拉
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| KeyWord |
jadeite; omphacite; petromineralogy; typomorphic characteristics; Guatemala
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| 基金项目 | |
| 页码 | 981-994 |
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