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Fig. 15. Cataclastic deformation and development of deformation band fault in the nonwelded tuff. (A) Mosaic of backscattered scanning electron image of a fault zone comprised of feldspar and pumice fragments in a calcite-ash-glass shard matrix. Fault zone lies below a large pumice grain (P) at the top of image. Note the lack of internal deformation of the pumice grain, despite the large volume of pore space (black) and the thin walls between the pores. Fault zone has fractures (f) along either side of fault; Q is quartz, (B) Thin zone of cataclasite with calcite (C) along the surface. Matrix consists of nonwelded tuff.
