Uranium isotope fractionation during magmatic-hydrothermal interactions in pegmatites

IF 3.6 2区地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS Chemical Geology Pub Date : 2025-01-20 DOI:10.1016/j.chemgeo.2025.122632

Jiaru Sheng , Yikang Quan , Dingsheng Jiang , Gengxin Deng , Guangwei Li , Zhiqin Xu , Fang Huang

{"title":"Uranium isotope fractionation during magmatic-hydrothermal interactions in pegmatites","authors":"Jiaru Sheng , Yikang Quan , Dingsheng Jiang , Gengxin Deng , Guangwei Li , Zhiqin Xu , Fang Huang","doi":"10.1016/j.chemgeo.2025.122632","DOIUrl":null,"url":null,"abstract":"<div><div>Uranium is a fluid-mobile and incompatible element and its isotopes can be used to trace the migration and enrichment of U in magmatic and fluid-related processes. To better understand the behavior of U isotopes during magmatic-hydrothermal interactions, this study presents U isotope data for a suite of borehole samples collected from the Jiajika granitic pegmatite field. Both pegmatites and aplites exhibit lower average δ<sup>238</sup>U of −0.37 ± 0.10 ‰ (2SD, <em>n</em> = 32) and − 0.36 ± 0.06 ‰ (2SD, <em>n</em> = 7), respectively, than the continental crust (−0.29 ± 0.03 ‰). Given the strong involvement of magmatic fluids during magma evolution in Jiajika pegmatites with low Zr/Hf (<26), the low δ<sup>238</sup>U and high U contents likely reflect the signature of magmatic fluids derived from underlying magma. This study reveals that the magmatic-hydrothermal interactions play a key role in fractionating U isotopes in granitoids. The light U isotope characteristics of granitoids may serve as a novel tracer for fluid-related processes, providing insights into the migration and enrichment of U and other fluid-mobile elements associated with magmatic fluids.</div></div>","PeriodicalId":9847,"journal":{"name":"Chemical Geology","volume":"677 ","pages":"Article 122632"},"PeriodicalIF":3.6000,"publicationDate":"2025-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Chemical Geology","FirstCategoryId":"89","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0009254125000221","RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"GEOCHEMISTRY & GEOPHYSICS","Score":null,"Total":0}

引用次数: 0

Abstract

Uranium is a fluid-mobile and incompatible element and its isotopes can be used to trace the migration and enrichment of U in magmatic and fluid-related processes. To better understand the behavior of U isotopes during magmatic-hydrothermal interactions, this study presents U isotope data for a suite of borehole samples collected from the Jiajika granitic pegmatite field. Both pegmatites and aplites exhibit lower average δ²³⁸U of −0.37 ± 0.10 ‰ (2SD, n = 32) and − 0.36 ± 0.06 ‰ (2SD, n = 7), respectively, than the continental crust (−0.29 ± 0.03 ‰). Given the strong involvement of magmatic fluids during magma evolution in Jiajika pegmatites with low Zr/Hf (<26), the low δ²³⁸U and high U contents likely reflect the signature of magmatic fluids derived from underlying magma. This study reveals that the magmatic-hydrothermal interactions play a key role in fractionating U isotopes in granitoids. The light U isotope characteristics of granitoids may serve as a novel tracer for fluid-related processes, providing insights into the migration and enrichment of U and other fluid-mobile elements associated with magmatic fluids.

查看原文

微信好友朋友圈 QQ好友复制链接

本刊更多论文

伟晶岩岩浆-热液相互作用过程中的铀同位素分馏

铀是一种流体流动和不相容元素，其同位素可用于追踪铀在岩浆和流体相关过程中的迁移和富集。为了更好地了解岩浆-热液相互作用过程中铀同位素的行为，本文对嘉集卡花岗伟晶岩田的一套钻孔样品进行了铀同位素数据分析。伟晶岩和长石的平均δ238U分别为- 0.37±0.10‰（2SD, n = 32）和- 0.36±0.06‰（2SD, n = 7），低于大陆地壳（- 0.29±0.03‰）。考虑到低Zr/Hf （<26）的甲集卡伟晶岩岩浆演化过程中岩浆流体的强烈参与，低δ238U和高U含量可能反映了岩浆源的岩浆流体特征。研究表明，岩浆-热液相互作用对花岗岩中铀同位素的分选起关键作用。花岗岩类轻铀同位素特征可作为流体相关过程的新型示踪剂，为研究岩浆流体中铀等流动元素的迁移和富集提供线索。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文去求助

来源期刊

Chemical Geology 地学-地球化学与地球物理

CiteScore

7.20

自引率

10.30%

发文量

374

审稿时长

3.6 months

期刊介绍： Chemical Geology is an international journal that publishes original research papers on isotopic and elemental geochemistry, geochronology and cosmochemistry. The Journal focuses on chemical processes in igneous, metamorphic, and sedimentary petrology, low- and high-temperature aqueous solutions, biogeochemistry, the environment and cosmochemistry. Papers that are field, experimentally, or computationally based are appropriate if they are of broad international interest. The Journal generally does not publish papers that are primarily of regional or local interest, or which are primarily focused on remediation and applied geochemistry. The Journal also welcomes innovative papers dealing with significant analytical advances that are of wide interest in the community and extend significantly beyond the scope of what would be included in the methods section of a standard research paper.