摘要
在全球科技与工业飞速发展的背景下,对稀有金属的需求日益增长,使得其研究显得尤为重要。青藏高原南部地区地热资源丰富,地热水中稀有金属富集,为研究地热系统中稀有金属的来源和成因提供了独特的研究平台。本研究专注于青藏高原南部地热系统中稀有金属元素特征,特别是Li、Rb、Cs等元素极度富集的现象。该现象已经引起了地质学界的广泛关注,但目前还缺乏一个全面的成因模型来阐明这些稀有金属的来源及其富集机制。因此,本文选择了位于亚东-谷露裂谷中段的羊易热泉及其周边岩浆岩作为研究对象,探究羊易热泉水化学特征,厘定羊易地区不同时代岩浆岩源区组成和演化特征,并揭示藏南温泉成因模式与稀有金属富集的关系。通过对羊易热泉的水化学及其周围岩浆岩的岩石地球化学分析,本研究得出了以下认识:(1)羊易热泉中稀有金属元素含量极度富集,且Cs含量高于Rb含量;(2)对羊易地区不同时代岩浆岩的Sr-Nd同位素分析显示,随着时间的推移,岩浆源区的同位素组成趋向富集,这暗示了印度古老大陆物质的贡献在逐渐增加;(3)热泉中Sr元素可能主要来自于水岩相互作用,而Li、Rb、Cs等元素更多源于高演化岩浆流体的贡献;(4)稀有金属元素最初在印度大陆地壳部分熔融形成的长英质岩浆中富集,随着岩浆演化,其流体进一步富集了这些元素,这是藏南温泉稀有金属富集的关键因素。本研究确定藏南温泉中Li、Rb、Cs等稀有金属元素主要来源于岩浆流体的注入,并建立起藏南温泉成因模式与稀有金属富集之间的关系。这不仅提供了对藏南地区温泉稀有金属富集现象的新见解,同时也为理解全球其他地区地热系统中稀有金属的富集机制提供了重要参考。
In the context of rapid global technological and industrial advancement,the growing demand for rare metals underscores the need for their study.The South Tibet develops abundant geothermal resources which are rich in rare metal elements,serving as a unique platform for research into the origin and formation of rare metal elements within geothermal systems.This study focuses on the characteristics of rare metal elements in the geothermal system of the southern Tibetan Plateau,especially the extreme enrichment of Li,Rb,Cs and other elements.Although this phenomenon has attracted significant attention in the geological community,a comprehensive model explaining the sources and enrichment mechanisms of these rare metal elements is lacking.Consequently,this paper investigates the Yangyi hot spring located in the central part of the Yadong-Gulu rift and its adjacent magmatic rocks,aiming to explore its hydrochemical characteristics,determine the composition and evolution characteristics of magmatic source areas from various eras in the Yangyi region,and reveal the connection between hot spring development in South Tibet and enrichment of rare metal elements.Analysis of the hydrochemistry of Yangyi hot spring and geochemistry of adjacent magmatic rocks led to the following insights:(1)The hot spring shows exceptional enrichment in rare metal elements,with a notably higher of Cs over Rb,which is a rarity in geothermal systems;(2)Sr-Nd isotope analysis in various-aged magmatic rocks indicates a gradual enrichment of the magmatic source,implying increased contributions from the Indian continent;(3)The Sr element in hot springs primarily originates from water-rock interaction,while elements such as Li,Rb,Cs are more derived from the contribution of highly evolved magmatic fluids;(4)Rare metal elements were initially concentrated in felsic magma,derived from the partial melting of the Indian continental crust,and further enriched by evolved magmatic fluids,playing a pivotal role in enriching rare metal elements within hot sp
作者
徐强
纪伟强
杨一鸣
李家亮
XU Qiang;JI WeiQiang;YANG YiMing;LI JiaLiang(State Key Laboratory of Lithospheric Evolution,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China;College of Earth and Planetary Sciences,University of Chinese Academy of Sciences,Beijing 100049,China)
出处
《岩石学报》
SCIE
EI
CAS
CSCD
北大核心
2024年第5期1669-1689,共21页
Acta Petrologica Sinica
基金
第二次青藏高原综合科学考察研究项目(2022QZKK0203)
国家自然科学基金项目(42488201)联合资助.
关键词
稀有金属
藏南热泉
水岩相互作用
岩浆演化
地热资源
Rare metal
Hot springs in South Tibet
Water-rock interaction
Magma evolution
Geothermal resources
