Host: Japan Association of Mineralogical Sciences
The residual strain in a quartz vein from a metamorphic province is determined by diffraction using synchrotron radiation at beamline BL02B1, SPring-8. Strain scanning method was adapted to measure the distribution of strains parallel to the sample surface. Diffraction angle for unstressed lattice spacing was determined from powder particles of the quartz vein. The peak shape of the quartz vein differs from the powder particles. The peak position shifts to lower diffraction angles and the peak broadening is found. These indicate that not only the macroscopic residual strain is induced in the quartz vein with the platy geometry with respect to the host rock, but also microscopic residual strain is formed across the several quartz grains. The strain magnitude was evaluated by peak shift for {112} reflection. The distribution shows tensile strains of 700 micro strains through the sample with small values near the surface.
