Geochronology and Thermochronology by the 40Ar/39Ar MethodArgon isotopic dating is one of the most important techniques for estimating the ages of rocks and can be used on very small samples. It has been used to assign reliable ages to the Earth and numerous meteorites. This second edition covers the standard principles and methods and incorporates many of new developments from the last decade. It covers the basis of the method, technical aspects, data presentation, diffusion theory, thermochronology, and many applications and case studies. |
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39 Ar released 40Ar/39 Ar dating activation energy age measurements age spectra alkali feldspar amphiboles analysis anorthoclase Apollo 11 apparent ages Ar/39 Ar age argon diffusion argon isotopes argon loss argon released Arrhenius plot atmospheric argon atoms basalts biotite calculated closure temperature commonly composition crystals Dalrymple dating method decay degassing derived diffusion domain distribution Earth Planet equation errors excess argon fluence monitor flux Foland fraction gas release geochronology geological gradients grain HIFAR hornblende ion beam irradiation isochron K-feldspar K/Ar ages K/Ar dating K/Ca Koobi Fora laboratory Lanphere laser laser beam laser microprobe Lovera lunar magnetic mass spectrometer metamorphic micas minerals muscovite neutron obtained outgassing parameter phengite phlogopite plagioclase plateau ples potassium produced radiogenic argon range reactor relatively release argon sample sanidine spectrum step heating experiment tephra thermal history tion trapped argon Tuff Turner utilized vacuum volcanic whole rock yield