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retrograde talc + chlorite after pyrope may be fluids evolved locally during retrograde melt crystallization. The similar 6D, but dissimilar 8180 values of the coesitebearing whiteschists and hosting orthogneiss suggest that the two were in hydrogen isotope equilibrium, but not oxygen isotope equilibrium. The unusual hydrogen and oxygen isotope compositions of the coesite-bearing unit can be explained as the result of metasomatism from slab-derived fluids at depth.

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