...again , i am on the hunt so please jump in. I see with Sans different time spans of geolgical settings in Rice Lake, could a pluton eruption have become apart of a volcanic eruption if they happen at the same time as we read that some in the Rice Lake have question....metamorphism, in geology, process of change in the structure, texture, or composition of rocks caused by agents of heat, deforming pressure, shearing stress, hot, chemically active fluids, or a combination of these, acting while the rock being changed remains essentially in the solid state. Theoretically, rocks are formed when their constituents are in equilibrium with ambient physical conditions. If the conditions are changed by movements in the earth's crust or by igneous activity, metamorphism occurs to reestablish equilibrium and changes the physical character of the rock mass.