透闪石玉研究中LA-ICP-MS技术的应用现状与展望

The Application Status and Prospect of LA-ICP-MS Technology in the Study of Tremolite Jade

摘要: 激光剥蚀电感耦合等离子体质谱(LA-ICP-MS)技术凭借原位微区、近无损、高灵敏度及多元素同步检测的优势，有效克服了透闪石玉矿物组成复杂、副矿物颗粒细小及珍贵样品难以破坏性测试等分析瓶颈，已成为透闪石玉研究的核心手段。本文首先阐述了该技术的仪器原理及其在分析点位精准选择、基体效应校正方面的应用难点与解决方案。在此基础上，从三大研究方向综述典型应用：成矿年代与矿床成因研究中，利用锆石U-Pb定年结合CL/BSE成像，成功约束了从古元古代至晚白垩世的多期成玉事件，建立了区域变质型、镁质矽卡岩型等成因模型；产地鉴别与古玉溯源研究中，基于微量元素及稀土元素地球化学指纹，结合多元统计与机器学习判别模型，实现了多产地玉料的精准区分，并为三星堆、金沙、齐家文化、徐州楚王陵等重要遗址出土古玉的玉料来源提供了科学证据；颜色成因研究中，通过定量测定不同颜色区域Fe、Mn、Cr、V等痕量致色元素含量，联合紫外–可见吸收光谱、光致发光光谱及电子顺磁共振等多种谱学手段，揭示了Mn²⁺致灰紫色、Cr³⁺致翠绿色、Fe³⁺协同Ti⁴⁺致黄色等致色机制。

Abstract: LA-ICP-MS, with its advantages of in-situ micro‑area analysis, near‑non‑destructiveness, high sensitivity and simultaneous multi‑element detection, has effectively overcome the analytical bottlenecks in tremolite jade research caused by complex mineral composition, fine‑grained accessory minerals, and the difficulty of performing destructive tests on precious samples. It has thus become a core analytical tool in the study of tremolite jade. This paper first describes the instrumental principle of LA-ICP-MS, as well as the challenges and corresponding solutions in precise selection of analytical spots and matrix effect correction. On this basis, typical applications are reviewed from three major research directions. In the study of mineralization age and deposit genesis, zircon U‑Pb dating combined with CL/BSE imaging has successfully constrained multiple tremolite jade‑forming events from the Paleoproterozoic to the Late Cretaceous, establishing genetic models such as the regional metamorphic type and the magnesian skarn type. In the study of provenance identification and ancient tremolite jade tracing, based on trace element and rare earth element geochemical fingerprints combined with multivariate statistical and machine learning discriminant models, accurate discrimination of tremolite jade materials from multiple provenances has been achieved, providing scientific evidence for the source of tremolite jade materials unearthed from important archaeological sites such as Sanxingdui, Jinsha, the Qijia Culture, and the Chu King’s Mausoleum in Xuzhou. In the study of color genesis, through quantitative determination of trace chromogenic elements (e.g., Fe, Mn, Cr, V) in different color zones and combination with various spectroscopic techniques including UV‑Vis absorption spectroscopy, photoluminescence spectroscopy, and electron paramagnetic resonance, the color‑causing mechanisms have been revealed, including the gray‑purple color induced by Mn²⁺, the emerald‑green color induced by Cr³⁺, and the yellow color induced by Fe³⁺-Ti⁴⁺ synergistic effect.