Microstructural and microchemical analysis of zircon in a syenite lithic fragment from Ulleung Island volcano, South Korea

IF 2.5 4区 化学 Q3 CHEMISTRY, ANALYTICAL
Seungsoon Choi, Keewook Yi, Haemyeong Jung, Albert Chang-sik Cheong
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Abstract

The intricate textural patterns commonly observed in metamorphosed and recrystallized zircon (ZrSiO4) underscore the crucial necessity of understanding the underlying mechanisms governing their formation to ensure accurate interpretation of the chemical and isotope data they contain. This study employed a combination of microanalytical techniques, including electron backscattered diffraction (EBSD) analysis, electron microprobe (EMP) mapping, and scanning electron microscope (SEM) imaging, to investigate the processes of formation and modification of zircon in a late Pleistocene (~ 35 ka) syenite enclosed within the Nari Tephra Formation on Ulleung Island in South Korea. Under cathodoluminescence (CL), zircons within the syenite reveal dark, featureless, or oscillatory-zoned cores containing numerous inclusions of britholite. These cores are partially or entirely replaced by inward-penetrating bright-CL domains that exhibit minimal inclusion presence. Despite these changes, the external morphologies of the zircons remain largely unchanged, and the faded oscillatory zoning is preserved in the replaced regions. EMP mapping discloses amoebiform micro-domains with high Y, U, and Th concentrations within the dark-CL cores, while the bright-CL domains are relatively deficient in these trace elements. Microstructural analysis of the zircons using EBSD mapping indicates no significant misorientation between the dark-CL cores and the bright-CL rims. Deformation-related low-angle boundaries by lattice distortion are clearly observed in certain grains, cutting across the discrete SEM and EMP domains, and often aligned along submicron pore trails. Microstructural and microchemical analyses carried out in this study establish that the zircons within the Ulleung syenite have undergone subsolidus recrystallization, a process likely influenced by the presence of fresh melts or fluids. This recrystallization process could be attributed to either coupled dissolution and reprecipitation or thermoactivated particle and defect volume diffusion due to inherent lattice strain. The subsequent deformation observed in the zircons might be a result of increased stress within the magma system after the recrystallization.
韩国郁陵岛火山正长岩碎屑中锆石的显微结构和显微化学分析
在变质和重结晶锆石(ZrSiO4)中通常可以观察到错综复杂的纹理模式,这就强调了了解其形成的基本机制的重要性,以确保准确解释其所包含的化学和同位素数据。本研究综合运用了电子反向散射衍射(EBSD)分析、电子显微镜(EMP)绘图和扫描电子显微镜(SEM)成像等微观分析技术,研究了韩国郁陵岛纳里热液地层中晚更新世(约 35 ka)正长岩中锆石的形成和改变过程。在阴极发光(CL)条件下,正长岩中的锆石显示出暗色、无特征或振荡带状的内核,其中含有大量的闪长岩包裹体。这些核心部分或全部被向内穿透的明亮-CL 域所取代,而这些明亮-CL 域显示出极少的包裹体存在。尽管发生了这些变化,但锆石的外部形态基本保持不变,被取代区域保留了褪色的振荡区带。EMP 图谱显示,在深色-CL 内核中具有高浓度 Y、U 和 Th 的变形虫状微域,而亮色-CL 域则相对缺乏这些微量元素。利用 EBSD 图谱对锆石进行的微结构分析表明,深色-CL 内核与亮色-CL 边缘之间没有明显的方向错位。在某些晶粒中可以清楚地观察到因晶格畸变而产生的与变形相关的低角度边界,这些边界穿过离散的 SEM 和 EMP 域,并且通常沿着亚微米孔隙轨迹排列。本研究进行的微结构和微化学分析证实,乌陵正长岩中的锆石经历了亚固结再结晶过程,这一过程很可能受到新鲜熔体或流体的影响。这一再结晶过程可归因于耦合溶解和再沉淀,或由于固有晶格应变导致的热激活颗粒和缺陷体积扩散。随后在锆石中观察到的变形可能是再结晶后岩浆系统内应力增加的结果。
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
Journal of Analytical Science and Technology
Journal of Analytical Science and Technology Environmental Science-General Environmental Science
CiteScore
4.00
自引率
4.20%
发文量
39
审稿时长
13 weeks
期刊介绍: The Journal of Analytical Science and Technology (JAST) is a fully open access peer-reviewed scientific journal published under the brand SpringerOpen. JAST was launched by Korea Basic Science Institute in 2010. JAST publishes original research and review articles on all aspects of analytical principles, techniques, methods, procedures, and equipment. JAST’s vision is to be an internationally influential and widely read analytical science journal. Our mission is to inform and stimulate researchers to make significant professional achievements in science. We aim to provide scientists, researchers, and students worldwide with unlimited access to the latest advances of the analytical sciences.
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