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Stable Isotopes
Refers to non-radioactive isotopes of elements, including those of oxygen, hydrogen, carbon, sulfur, and nitrogen. In geothermal geochemistry, the stable isotope ratios of oxygen (18O/16O) and hydrogen (2H/1H) in thermal waters are used to trace its origin (e.g., meteoric, magmatic).
Geothermal Glossary
Word of the Week – Helium Isotopes
Helium Isotopes Helium gas is a trace constituent of groundwater and thermal fluids, and the ratio of 3He to 4He can be measured with a high-precision mass spectrometer to determine whether it is derived from air, from the radioactive decay of uranium and thorium in...
Word of the Week – Hot Dry Rock
Hot Dry Rock Hot crystalline rock with essentially no porosity and lacking producible hot water. Geothermal production from hot dry rock reservoirs is the primary goal of EGS (enhanced geothermal system) research in which cold water is injected and hot fluid is...
Word of the Week – Hydraulic Fracture
Hydraulic Fracture A rock-hosted tensile fracture that is created by injection of fluid under high pressure.