Influence of Different Elemental Substitutions in Epidote on Its Crystal Structure

doi:10.19657/j.geoscience.1000-8527.2024.041

Abstract

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

CLC Number:

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

Figures/Tables 4

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

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

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

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

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