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Abstract

Silicic magmatic processes which contribute to the formation of ore deposits can be subdivided in three stages: 1. the origin of the silicic magma; 2. intrusion and fractionation processes; 3. volatile evolution and separation. This chapter will deal with the physical and chemical processes involved magmatic evolution. Subsequent chapters will deal with chemical fractionation and ore deposition processes.

Evaluating the origin of silicic magmas is an indirect process. Most plutons have undergone extensive post-solidification re-crystallization to some degree. In addition, the extensive modifications caused by upward-migration through the crust and crystallization have altered the evidence of magma origins. Thus, in discussing the physical conditions of magma generation it helps to use volcanic analogs and experimental data.

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