喜马拉雅浅花岗岩中的富锂电气石——以西藏Gabo富锂花岗伟晶岩系为例

IF 1.4 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS
Hongzhao Shi, Yiyun Wang, Linkui Zhang, Hong Liu, Weikang Guo, Jiangang Fu
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引用次数: 0

摘要

加坡锂矿床是喜马拉雅成矿带内新发现的伟晶岩型锂矿床。电气石-白云母花岗岩与锂伟晶岩脉具有密切的空间相关性,是矿区最大的浅色花岗岩。本研究旨在探讨电气石的成因,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加坡矿床的电气石-白云母花岗岩中。电气石的组成和原位硼同位素研究表明,电气石主要属于校石族,Li-Sn含量和δ11B值均升高(- 11.6‰~ - 10.5‰)。说明碧玺在结晶过程中主要由富硼花岗质岩浆富集单质锂结晶而成。与喜马拉雅造山带主要稀有金属亮花岗伟晶岩相比较,认为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。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

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

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

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.

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来源期刊
Acta Geochimica
Acta Geochimica GEOCHEMISTRY & GEOPHYSICS-
CiteScore
2.80
自引率
6.20%
发文量
1134
期刊介绍: Acta Geochimica serves as the international forum for essential research on geochemistry, the science that uses the tools and principles of chemistry to explain the mechanisms behind major geological systems such as the Earth‘s crust, its oceans and the entire Solar System, as well as a number of processes including mantle convection, the formation of planets and the origins of granite and basalt. The journal focuses on, but is not limited to the following aspects: • Cosmochemistry • Mantle Geochemistry • Ore-deposit Geochemistry • Organic Geochemistry • Environmental Geochemistry • Computational Geochemistry • Isotope Geochemistry • NanoGeochemistry All research articles published in this journal have undergone rigorous peer review. In addition to original research articles, Acta Geochimica publishes reviews and short communications, aiming to rapidly disseminate the research results of timely interest, and comprehensive reviews of emerging topics in all the areas of geochemistry.
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