Processes of fluid supply to arc crust constrained from hydration reaction zones between peridotite and granitic dyke, East Antarctica

Abstract

The mode of fluid transport to arc crust has been constrained from hydration reaction of the pargasite–phlogopite peridotite intruded by granitic dyke, Sør Rondane Mountains, East Antarctica. Thermodynamic and mass balance analysis indicates that hydration proceeded by pervasive flow before the granitic dyke intrusion. The ratio of pervasive hydration over brittle hydration is estimated to be 3, suggesting the importance of pervasive flow at middle crustal depth.