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Progress in Earth and Planetary Science
Fig. 5 | Progress in Earth and Planetary Science

Fig. 5

From: The architecture of long-lived fault zones: insights from microstructure and quartz lattice-preferred orientations in mylonites of the Median Tectonic Line, SW Japan

Fig. 5

Ryoke-derived fault rocks in thin section. Letter after sample name indicates the degree of cataclasis (see text). a Lightly fractured Ryoke protomylonite sample containing altered plagioclase (Pl) and K-feldspar (K-spar) porphyroclasts wrapped by a matrix of recrystallised quartz (Qz) and chlorite (Chl). Fractures within feldspar porphyroclasts are filled with calcite (Cal) (cross-polarised light). b Exterior mylonite sample showing characteristic coarse recrystallised quartz grains, separated by lobate grain boundaries (arrows; cross-polarised light)). c Ultramylonite sample that has undergone limited fragmentation and slip along shear fractures (plane-polarised light). d Protomylonite sample cut by late-stage coarse-grained prehnite (Pr)–calcite veins (cross-polarised light). e Cataclasite displaying progressive granulation and development of a phyllosilicate foliation (P-fol) from right to left. PSS pressure-solution seam (plane-polarised light). f Cataclasite displaying isoclinal folding of a cataclastic foliation, with ultra-cataclasite (u-cc) developed in the fold hinge (plane-polarised light)

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