Figure F33. XRD plots comparing geochemistry of (A) strata above, (B) bedding-parallel shear zone, and (C) strata below. Quartz fraction is the major difference between layers. Strata above and within shear zone are indistinguishable. Strata below has a peak near 56°2θ that is not in A or B. Similarity between layers suggests material in shear zone has been derived from surrounding undeformed material and has undergone grain-size reduction. cps = counts per second.
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