绿帘石族矿物不同元素置换对其晶体结构的影响

doi:10.19657/j.geoscience.1000-8527.2024.041

摘要/Abstract

摘要：

绿帘石族矿物是常见的岛状含水Ca-Al硅酸盐矿物。由于非等效结构位点较多,绿帘石族矿物可显著富集多种微量元素,特别是二价大离子亲石元素(Sr和Pb)、稀土元素(REE)和过渡族金属元素(TME)。在一定的温压条件下,这些离子会与绿帘石族中的Ca、Fe、Al等离子进行类质同象替代。本文总结了绿帘石族中Fe、Mn、Sr、Pb、Cr、V、REE等元素在其晶体中发生替代所带来的微观结构变化,有助于深入理解该矿物在示踪成矿流体源区、指示流体成分与温压条件变化过程的应用,并为该矿物U-Pb同位素定年方法提供了重要的晶体化学基础。

关键词: 绿帘石族矿物, 元素置换, 晶体结构, 地质示踪, 同位素定年

Abstract:

Epidote group minerals are common hydrous nesosilicate. The unique crystal structure of epidote allows them to be significantly enriched in various trace elements, especially divalent large ionic lithophilic elements (Sr and Pb), rare earth elements (REE), and transition group metallic elements (TME). Under certain temperature and pressure conditions, these ions will be substituted with Ca, Fe, and Al ions in cordite in a homogeneous manner. This paper summarizes the microstructural changes brought about by the substitution of elements such as Fe, Mn, Sr, Pb, Cr, V, and REE in the crystals of epidote, and aid in understandingthe important applications of such microstructural properties in tracing the fluid source region, in indicating the changes in fluid composition and processes, and in geochronology.

Key words: epidote group mineral, elemental replacement, crystal structure, geological tracing, isotopic dating

中图分类号:

陈胤轩, 李林. 绿帘石族矿物不同元素置换对其晶体结构的影响[J]. 现代地质, 2025, 39(03): 696-703.

CHEN Yinxuan, LI Lin. Influence of Different Elemental Substitutions in Epidote on Its Crystal Structure[J]. Geoscience, 2025, 39(03): 696-703.

图/表 4

图1 绿帘石晶体结构(棕色:M3八面体,红色:O,黄色:A多面体,灰色:M1,2八面体)

Fig.1 Crystal structure of epidote(Brown part:M3 octahedron, red ball:O, yellow ball:A polyhedron, gray part:M1,2 octahedron)

图2 黝帘石晶体结构图(棕色:M3八面体,红色:O,黄色:A多面体,灰色:M1,2八面体)

Fig.2 Crystal structure of zoisite(Brown part:M3 octahedron, red ball:O, yellow ball:A polyhedron, gray part:M1,2 octahedron)

图3 红帘石晶体结构图(棕色:M3八面体,红色:O,黄色:A多面体,灰色:M1,2八面体)

Fig.3 Crystal structure of piemontite(Brown part-M3 octahedron, red ball:O, yellow ball:A polyhedron, gray part:M1,2 octahedron)

图4 红帘石1H固体核磁共振谱图(从左至右依次为:MAS=20、26、32 kHz)

Fig.4 1H solid MAS NMR spectrum of piemontite(From left to right: MAS = 20, 26, 32 kHz)

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