Fig. 4
Estimation of fluid pressure change during single crack-seal event. a, c Appearance of primary liquid–vapor fluid inclusions (yellow portions) between inclusion bands under plane-polarized light. Dashed red lines indicate phyllosilicate inclusion bands. b, d, e Closeup of fluid inclusions, showing various vapor/liquid ratios. Locations of images are shown in (a and c). The area fractions of liquid water in fluid inclusion are shown. f–i Measured vapor/liquid ratios of primary fluid inclusions trapped during single crack-seal event for various inclusion band spacings. j–m Fluid pressure drop during single crack-seal event estimated from the vapor/liquid ratios