Raman mapping reveals alpha radiation damage zonation and its annealing in Durango apatite

IF 4.8 1区地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS

Earth and Planetary Science Letters Pub Date : 2025-09-13 DOI:10.1016/j.epsl.2025.119636

Xiaowei Zeng , Guido Pastore , Chuanbo Shen , Alberto Resentini , Hongyang Fu , Chaoqun Yang , Yannick Buret , Pieter Vermeesch , Marco G. Malusà

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引用次数: 0

Abstract

The accumulation of alpha radiation damage and annealing mechanisms in apatite are crucial for thermochronological studies, yet they are challenging to explore. We conducted annealing experiments on four slices from one single Durango apatite crystal, utilizing Raman spectroscopy high-resolution mapping to investigate peak positions and full width at half maximum (FWHM) of the ν₁(PO₄) and ν₃(PO₄) bands. Additionally, LA-ICP-MS mapping was conducted on all samples to obtain their effective uranium content distribution. We assessed track density in various regions of the crystal, used a normalized track density reduction model to estimate original alpha radiation damage, and applied heavy ion irradiation to simulate the fission process and enhance the visibility of confined tracks. Our analysis shows that the FWHM of the ν₁(PO₄) band in Durango apatite is a reliable indicator of alpha radiation damage accumulation and does not correlate with fission track damage. We also found that the alpha radiation damage has negligible effect on fission-track annealing in young samples. While Raman peak position behaviour is still enigmatic, our results suggest that it may be influenced both by the chemical composition of apatite and by radiation damage accumulation. Our results underscore the potential of Raman spectroscopy as a powerful tool for assessing alpha radiation damage and annealing processes in apatite crystals.

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拉曼图揭示了杜兰戈磷灰石α辐射损伤分带及其退火过程

磷灰石中α辐射损伤的积累和退火机制对于热年表研究至关重要，但它们的探索具有挑战性。我们对一个杜兰戈磷灰石晶体的四个薄片进行了退火实验，利用拉曼光谱高分辨率映射研究了ν1（PO4）和ν3（PO4）波段的峰位和半峰全宽（FWHM）。此外，对所有样品进行LA-ICP-MS制图，获得其有效铀含量分布。我们评估了晶体不同区域的径迹密度，使用归一化径迹密度减少模型来估计原始α辐射损伤，并使用重离子辐照来模拟裂变过程并增强封闭径迹的可见性。分析表明，杜兰戈磷灰石ν1（PO4）带的FWHM是α辐射损伤积累的可靠指标，与裂变径迹损伤无关。我们还发现α辐射损伤对年轻样品的裂变径迹退火的影响可以忽略不计。虽然拉曼峰位置行为仍然是谜，但我们的研究结果表明，它可能受到磷灰石的化学成分和辐射损伤积累的影响。我们的研究结果强调了拉曼光谱作为评估α辐射损伤和磷灰石晶体退火过程的有力工具的潜力。

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来源期刊

Earth and Planetary Science Letters 地学-地球化学与地球物理

CiteScore

10.30

自引率

5.70%

发文量

475

审稿时长

2.8 months

期刊介绍： Earth and Planetary Science Letters (EPSL) is a leading journal for researchers across the entire Earth and planetary sciences community. It publishes concise, exciting, high-impact articles ("Letters") of broad interest. Its focus is on physical and chemical processes, the evolution and general properties of the Earth and planets - from their deep interiors to their atmospheres. EPSL also includes a Frontiers section, featuring invited high-profile synthesis articles by leading experts on timely topics to bring cutting-edge research to the wider community.