Illite crystallinity (IC), widely used to evaluate variations in metamorphic conditions, primarily depends on temperature (e.g.,Kisch, 1983; Frey, 1987). IC is determined by measuring the half-peak-width of the 10-Å illite peak on oriented mineral aggregate preparations of the <2-μm size fractions (Kubler, 1967, 1968), and is expressed in °Δ2𝛉. Over the past three decades, major advances were made in the study and understanding of illite crystallinity. The effects of sample preparation (Krumm and Buggisch, 1991), instrumental conditions and interlaboratory standardization and calibration (Kisch, 1990, 1991), and measured precision...

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