36 articles
Thermochronology
Thermochronology is a family of geochronologic dating methods that determine when and how fast rocks cooled through temperature-sensitive isotopic and fission-track systems, reconstructing a rock's thermal history.
Triple oxygen isotope analysis
Triple oxygen isotope analysis measures the relative abundances of the stable oxygen isotopes ¹⁶O, ¹⁷O, and ¹⁸O, quantifying deviations that record temperatures, hydrologic processes, and atmospheric chemistry.
Uniformitarianism
Uniformitarianism, or the principle of uniformity, is the geological principle that processes observed today, like erosion and volcanism, shaped Earth in the past; James Hutton proposed it in 1788.
Uranium–thorium–helium thermochronology
Uranium–thorium–helium ((U-Th)/He) thermochronology is a geochronology method dating minerals by radiogenic helium from uranium and thorium decay, used to study exhumation, fault slip, and landscape evolution.
Zircon geochronology
Zircon geochronology is a dating method that determines the ages of rocks by measuring uranium-lead isotope ratios in zircon crystals, which exclude lead when they form.
Zircon U–Pb dating
Zircon U–Pb dating is a geochronological method that measures uranium-to-lead isotope ratios in zircon crystals, dating igneous rocks and sediments with internal consistency checks from two decay chains.