Hydrothermal circulation in its most general sense is the circulation of hot water; 'hydros' in the Greek meaning water and 'thermos' meaning heat. Hydrothermal circulation occurs most often in the vicinity of sources of heat within the Earth's crust. This generally occurs near volcanic activity, but can occur in the deep crust related to the intrusion of granite, or as the result of orogeny or metamorphism.
Read more about Hydrothermal Circulation: Seafloor Hydrothermal Circulation, Volcanic and Magma Related Hydrothermal Circulation, Deep Crust
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