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Basalt
Dark grey fine grained volcanic rock composed of plagioclase, pyroxene and olivine, with relatively low silica (45-52 wt %). The composition reflects an upper mantle origin. Basalt is the most common type of volcanic rock on Earth, and it erupts from mid-ocean spreading ridges and hot spots (e.g., Hawaii and Iceland). The intrusive coarsely crystalline igneous rock equivalent is called gabbro.
Geothermal Glossary
Word of the Week – Two-Phase Flow
Two-Phase Flow A condition that is attained in production wells associated with high temperature (>200°C) geothermal reservoirs, wherein the flowing fluid comprises a mixture of steam and water. As the two-phase fluid depressurizes in the well, it expands causing...
Word of the Week – Turbine
Turbine Spinning axle mounted with fan blades that converts a fluid flow stream into mechanical energy. To produce electricity, the mechanical energy from the turbine is connected to a generator.
Word of the Week – Unconformity
Unconformity Geological term that refers to an ancient surface that has been buried and now represents a discontinuity or break between coherent masses of rock or strata.