Fig. 2
From: Crystal plasticity as an indicator of the viscous-brittle transition in magmas
Photomicrographs of the natural and experimentally deformed samples. COLB2 has relatively few pores (in blue), and those present are small and intermittently clustered in the starting material (a). COLLAH4 starting material has more, larger, vesicle-shaped pores (e). In both samples (b–d for COLB2, f–h for COLLAH4), applying stress and strain resulted in fracturing sub-parallel to the compression direction (compression direction is horizontal in the current view). These fractures are first seen in the crystals at lower stress or strain conditions, and then as imposed stress or strain is increased, the fractures coalesce through the interstitial glass, and grain crushing dominates. Scale bar is 1 mm and refers to all panels. PI plagioclase, Px pyroxene, Ox iron-titanium oxides
