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Fig. 8. X-ray diffraction patterns for undeformed and deformed samples from the Crucifix site. (A, B) samples from the thick pumice-rich unit (see Fig. 7b for location) show marked contrast in the amount of noncrystalline (glass) material in the primary deposit vs. a quartz–calcite rich fault zone. (C, D) Analysis of a thinner ash-rich sequence shows the presence of feldspar phenocrysts and glass, which in the fault zone becomes a more ordered quartz–feldspar cataclasite.
