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Abstract

Micas and other phyllosilicates are important recorders of metamorphic processes and reaction progress. The presence of sheet silicates in the lowest diagenetic grade, through higher metamorphic zones, to anatexis allows for the continuous monitoring of physico-chemical changes during metamorphism. Their fine-grained nature, and their penchant for mixing on very small scales, makes the use of transmission electron microscopy (TEM) essential for detailed crystal-chemical examinations and determinations of chemical compositions. This chapter outlines the advances in our understanding of low-grade metamorphism, deformation and intergrowths in micas and some related phyllosilicates, that have benefited from TEM studies. Particular attention is paid to low-grade metamorphism and then to selected studies illustrating the value of TEM.

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