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Earth, Planets and Space
Fig. 2 | Earth, Planets and Space

Fig. 2

From: Generation of billow-like wavy folds by fluidization at high temperature in Nojima fault gouge: microscopic and rock magnetic perspectives

Fig. 2

a Optical image of a thin section from block sample 5 in Fig. 1d. The fault gouge consists of three parts, incohesive grayish gouges, cohesive blackish gouges, and weathered granites. The microstructure shows turbulent disordered textures, laminated textures, and billow-like wavy folds. b Surface magnetic field distribution of the thin-section sample observed under the MI magnetic microscope after imparting IRM at 1 T. White regions correspond to near-average magnetic field, and red (blue) regions correspond to upward (downward) oriented fields. The voltage is proportional to the magnetic field detected by the MI sensor. c Backscattered electron (BSE) image of the billow-like wavy folds in the solid red rectangle in (a). d Schematic of the billow-like wavy folds in the red dashed rectanglein (a), which are generated between the cohesive blackish gouge and the weathered granites. e Definition of width (l) and wavelength (λ) of the billow-like wavy folds

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