湖北十堰南化塘绿松石的谱学特征研究

doi:10.3964/j.issn.1000-0593(2025)09-2467-08

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摘要：鄂豫陕绿松石矿区是我国重要的绿松石产区，其中南化塘绿松石矿点位于湖北十堰郧阳区。通过常规宝石学测试、红外光谱分析、拉曼光谱分析、激光剥蚀电感耦合等离子体质谱（LA-ICP-MS）测试以及紫外-可见光谱分析等方法，对南化塘绿松石样品进行了系统研究，旨在揭示其矿物学和光谱学特征，为产地溯源提供数据支持。实验结果显示，南化塘绿松石样品化学成分复杂，显著富集Na、Mg、K、Ca、Sc、Ti、V、Cr、Zn、Mo和Ba等元素，其中Ca、Cr、K、Mo和Ba的含量远高于其他矿点。稀土元素特征显示其球粒陨石归一化分配模式呈左倾型，总质量分数（ΣREE）较低，轻稀土相对亏损，重稀土相对富集，分馏程度显著。拉曼光谱分析表明，主要吸收峰位于3 470 cm^-1（羟基伸缩振动）和1 040 cm^-1（磷酸根对称伸缩振动）。紫外-可见吸收光谱分析揭示，绿松石的颜色表现与其化学组成密切相关，Cu²⁺离子的d—d电子跃迁（670～690 nm吸收带）是绿松石呈现蓝色的关键因素，而Fe³⁺离子的电子跃迁位于428 nm。综上所述，论文揭示了南化塘绿松石的产地特征，为开展相关的绿松石产地溯源研究提供了数据支撑。

关键词：南化塘；绿松石；南矿带；谱学特征

Abstract：The EYS(E-Hu-Shaan) turquoise mining area is a significant turquoise-producing region in China, with the Nanhuatang turquoise deposit located in the Yunyang District of Shiyan City, Hubei Province. This study systematically investigates Nanhuatang turquoise samples using conventional gemmological testing, infrared spectroscopic analysis, Raman spectroscopy, laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS), and UV-visible spectroscopic analysis. The aim is to elucidate the mineralogical and spectroscopic characteristics of these samples and provide data support for provenance tracing.Results indicate that the chemical composition of Nanhuatang turquoise is complex, with significant enrichment in Na, Mg, K, Ca, Sc, Ti, V, Cr, Zn, Mo, and Ba. Notably, the concentrations of Ca, Cr, K, Mo, and Ba are considerably higher than those observed in other turquoise deposits. Rare earth element (REE) analysis reveals a left-dipping chondrite-normalized distribution pattern, characterized by low total REE content (ΣREE), relative depletion of light REEs, and relative enrichment of heavy REEs, with significant fractionation between the two groups. Raman spectral analysis showed that the main absorption peaks were located at 3 470 cm^-1 (hydroxyl group stretching vibration) and 1 040 cm^-1 (phosphate symmetry stretching vibration). UV-Vis absorption spectroscopy demonstrates that the coloration of turquoise is closely related to its chemical composition.The d—d electron jump of Cu²⁺ ions (670~690 nm absorption band) is a key factor in the blue colouration of turquoise, while the electron jump of Fe³⁺ ions is located at 428 nm.Based on the above analysis, the paper reveals the geological features of the Nanhuatang turquoise source area, providing data support for conducting turquoise provenance studies.

Key words：Nanhuatang; Turquoise; South ore zone; Spectroscopy

收稿日期: 2025-01-25 修订日期: 2025-04-30

中图分类号:

O433.4

基金资助: 国家社会科学基金项目（20BKG030），国家自然科学基金面上项目（42272212），国家资助博士后研究人员计划项目（GZB20230683），中国博士后科学基金第76批面上项目（2024M763059）资助

通讯作者: 杨明星 E-mail: yangc@cug.edu.cn

作者简介: 汪毅，2004年生，中国地质大学（武汉）珠宝学院本科生 e-mail: wang.yi@cug.edu.cn

引用本文:

汪毅，杨明星，顿瑾涵，姜炎，刘玲，袁冶. 湖北十堰南化塘绿松石的谱学特征研究[J]. 光谱学与光谱分析, 2025, 45(09): 2467-2474.
WANG Yi, YANG Ming-xing, DUN Jin-han, JIANG Yan, LIU Ling, YUAN Ye. Spectroscopic Characterization of Turquoise From Nanhuatang, Shiyan, Hubei. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2025, 45(09): 2467-2474.

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https://www.gpxygpfx.com/CN/10.3964/j.issn.1000-0593(2025)09-2467-08 或 https://www.gpxygpfx.com/CN/Y2025/V45/I09/2467

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