Fluid-rock interaction deduced from geological time bright-layer in the middle crust

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The geological time bright-layer was recognized in the low-P/T metamorphic rocks. We found that silicified rocks distribute as layers or lenticular bodies, and they are restricted in the greenscist facies conditions within structurally vertical thickness. Quartz veins crossing high-angles with schistosity were preferentially developed. The mode of occurrences of quartz veins indicates that silicified rocks are competent relative to underlying rocks. Rock boundary with high competence contrast is probably a good reflector of seismic waves. Seismic bright-layer reflections in the middle crust would be arisen from observed silicified rock layers in this study, if those are distributed in the deep crust to a considerable extent.