中国地质调查局Shi Hongzhao团队以西藏嘎波富锂花岗岩-伟晶岩系统为例，研究了喜马拉雅浅花岗岩中富锂电气石。2025年1月15日，《地球化学学报》发表了这一成果。

据悉，嘎波锂矿床是喜马拉雅成矿带内新发现的伟晶岩型锂矿床。矿区内最大的浅花岗岩体为花岗岩，与锂伟晶岩脉具有密切的空间相关性。

本研究旨在探讨其成因、评价伟晶岩型锂矿床的意义和潜力。电气石广泛分布于西藏罗扎县嘎波矿床的电气石-白云母花岗岩中，电气石的组成和原位硼同位素研究表明，电气石主要属于schorl群，Li-Sn含量和δ¹¹B值(-11.6‰至-10.5‰)表现出均匀升高。这表明它们的岩浆主要是在富硼花岗质岩浆结晶过程中，富集单质锂元素形成的。

研究结果强调，与喜马拉雅造山带主要的稀有金属浅花岗岩-伟晶岩相比较，电气石中锂含量的升高可作为，高演化伟晶岩型稀有金属矿床的有效矿物指示物。

附：英文原文

Title: Lithium-rich tourmaline in Himalayan leucogranite: An example from the Gabo Li-rich granite-pegmatite system, Xizang, China

Author: Shi, Hongzhao, Wang, Yiyun, Zhang, Linkui, Liu, Hong, Guo, Weikang, Fu, Jiangang

Issue&Volume: 2025-01-15

Abstract: The Gabo lithium deposit represents a newly discovered pegmatite-type lithium deposit within the Himalayan metallogenic belt. The tourmaline-muscovite granite, the largest leucogranite in the mining area, displays a close spatial correlation with the Li-pegmatite veins. This study aims to examine the genesis of tourmaline and evaluate the significance and potential of pegmatite lithium deposits. Tourmaline is extensively distributed in tourmaline-muscovite granite at Gabo deposit in Luozha county (Xizang). Investigation of the compositional and in situ boron isotopes of the tourmaline revealed that the tourmalines mainly belong to the schorl group and exhibit uniform elevated Li–Sn contents and δ¹¹B values (-11.6 ‰ to -10.5‰). This indicates that the tourmaline mainly crystallized from a boron-rich granitic magma undergoing enrichment in elemental lithium during the tourmaline crystallization process. Compared with the principal rare metal leucogranite-pegmatites in the Himalayan orogen, it is proposed that the elevated lithium (Li) content of tourmaline serves as an effective mineral indicator for the highly evolved pegmatite-type rare metal deposits.

DOI: 10.1007/s11631-024-00753-8

Source: https://link.springer.com/article/10.1007/s11631-024-00753-8