 Hydrothermal circulation

Hydrothermal circulation transports heated water-rich fluid through connected pores and fractures in rock. A heat source warms the fluid; buoyancy and pressure differences drive motion where the rock has sufficient porous permeability. Cooler inflow and warmer outflow can establish a circulation loop.

The fluid carries dissolved components as well as heat. Changes in temperature, pressure or chemical conditions along its path cause dissolution, precipitation and hydrothermal alteration. Measurements at a hydrothermal vent therefore reflect both the deep source and reactions during transport, rather than an unchanged sample of a magma chamber.

Hydrothermal circulation refers to the movement of water that is heated by geological processes within the Earth's crust, particularly in areas of volcanic activity or along mid-ocean ridges. This process plays a crucial role in the thermal and chemical dynamics of the Earth's crust and ocean floor. Here's how hydrothermal circulation typically works: 1. **Heat Source**: The circulation is usually driven by heat from magma or hot rocks below the Earth's surface. This heat causes water in the surrounding rock to become heated.