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metamorphic rock metamorphism Chapter 7 Chapter 7 heat lithostatic pressure Chapter 7 Chapter 7 differential pressure fluid activity Chapter 7 Chapter 7 contact (thermal) metamorphism Chapter 7 aureole Chapter 7 dynamic metamorphism regional metamorphism Chapter 7 Chapter 7 index mineral foliated texture Chapter 7 Chapter 7 nonfoliated texture metamorphic zone Chapter 7 Chapter 7 metamorphic facies Chapter 7 Any rock that has been changed from its original condition by heat, pressure, and the chemical activity of fluids, as in marble and slate. The phenomenon of changing rocks subjected to heat, pressure, and fluids so that they are in equilibrium with a new set of environmental conditions. An agent of metamorphism. Pressure exerted on rocks by the weight of overlying rocks. Pressure that is not applied equally to all sides of a rock body. An agent of metamorphism in which water and carbon dioxide promote metamorphism by increasing the rate of chemical reactions. Metamorphism of country rock adjacent to a pluton. A zone surrounding a pluton in which contact metamorphism took place. Metamorphism in fault zones where rocks are subjected to high differential pressure. Metamorphism that occurs over a large area, resulting from high temperatures, tremendous pressure, and the chemical activity of fluids within the crust. A mineral that forms within specific temperature and pressure ranges during metamorphism. A texture in metamorphic rocks in which platy and elongate minerals are aligned in a parallel fashion. A metamorphic texture in which there is no discernable preferred orientation of minerals. The region between lines of equal metamorphic intensity known as isograds. A group of metamorphic rocks characterized by particular minerals that formed under the same broad temperature and pressure conditions.