F. Chapter 7 - F. Chapter 7 Metamorphism From Greek meta...

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Chapter 7 Metamorphism From Greek meta (change) and morpho (shape ) Metamorphic rocks are the third major group of rocks During metamorphism, the original rock is acted on by various agents that change the mineral composition or texture, forming new rocks. Solid state changes – the original rock doesn’t melt. The metamorphic rock formed depends on: Composition and texture of the original rock Agents of metamorphism present Amount of time rock is subjected to the agents Agents of Metamorphism Heat Important because it increases the rate of chemical reactions that may produce minerals different from those in the parent rock. Heat sources 1. Intrusive magma 2. Deep burial (such as during subduction along a convergent plate boundary.) Pressure Lithostatic pressure – results from burial of the rock. The weight of the overlying rocks is applied equally in all directions. (See Fig.6.3) Differential pressures – results when pressures are not equal on all sides and the rock is distorted. This typically occurs during deformation associated with mountain building.
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F. Chapter 7 - F. Chapter 7 Metamorphism From Greek meta...

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