Zirconium and its isotope behavior during weathering on Hainan Island, China

IF 3.6 2区地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS

Chemical Geology Pub Date : 2025-07-23 DOI:10.1016/j.chemgeo.2025.122979

Yu Jiao , Lian Zhou , Jing-Liang Guo , Lanping Feng , Jinhua Liu , Daqian Zhang , Jianping Wang , Mulong Chen , Yong Wang , Zailong Hu

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引用次数: 0

Abstract

Zirconium (Zr) is mobile during extreme weathering. However, the Zr stable isotope (δ^94/90Zr) behavior in the weathering profile has not been investigated, although Zr isotope has gained much attention for tracing the provenance of sediments. Here, the behavior of Zr and its isotopes during chemical weathering was investigated from basaltic (Penglai) and granitic (Qionghai) weathering profiles on Hainan Island, China. At the Penglai basaltic weathering profile, Zr was gradually removed from the near-surface horizons, transferred downwards and precipitated in deeper horizons, which likely driven by the acid environment and organic matter in the soil layer. The sequential extraction experiment shows that Zr was released from the residual phase and adsorbed into exchangeable and adsorbed phases during increasing weathering. However, Zr isotopes in the weathering samples and bedrock are consistent within uncertainty, suggesting Zr mobilization during chemical weathering does not result in pronounced Zr isotope fractionation in the whole basaltic weathering profile. At the Qionghai granitic weathering profile, the variation in Zr concentration is likely related to zircon migration, but the shift in Zr isotope composition <0.10 ‰ fractionation in the weathering profile. Our results show that insignificant Zr isotope fractionation occurred during weathering in both basaltic and granitic weathering profiles. Notably, Zr isotopes of the weathering samples in the basalt are distinguishable from that of granite, implying that Zr isotope of sediments has the potential to trace their provenance.

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海南岛风化过程中锆及其同位素特征

锆（Zr）在极端风化过程中是可移动的。然而，尽管Zr同位素在沉积物物源溯源方面受到广泛关注，但其稳定同位素（δ94/90Zr）在风化剖面中的表现尚未得到研究。本文研究了海南岛蓬莱玄武岩和琼海花岗岩风化剖面中锆及其同位素的化学风化行为。在蓬莱玄武岩风化剖面上，Zr从近地表层逐渐被移出，向下转移并在更深层沉积，这可能是受酸性环境和土层有机质的驱动。序贯萃取实验表明，随着风化作用的增加，Zr从残余相中释放出来，吸附到交换相和吸附相中。然而，风化样品和基岩中的Zr同位素在不确定度范围内是一致的，这表明化学风化过程中Zr的活化并没有导致整个玄武岩风化剖面中Zr同位素的明显分馏。在琼海花岗岩风化剖面上，Zr浓度的变化可能与锆石迁移有关，但与风化剖面中Zr同位素组成<；0.10‰分异有关。结果表明，玄武岩和花岗质风化剖面在风化过程中均发生了不明显的Zr同位素分馏。值得注意的是，玄武岩风化样品的Zr同位素与花岗岩风化样品的Zr同位素具有明显的区别，表明沉积物的Zr同位素具有追溯其物源的潜力。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.