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

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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.

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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.