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RTabsolute age
 annealing
 Ar/Ar
 cooling
 crystallization
 diffusion
 exposure age
 fission tracks
 fission-track dating
 geochronology
 geologic thermometry
 He/He
 meteorites
 P-T conditions
 P-T-t paths
 Rb/Sr
 relative age
 Sm/Nd
 stratigraphy
 thermal history
 tectonics
SNDetermination of temperature-time-depth histories in metamorphic rocks. Techniques may include a combination of several of the isotopic techniques of absolute age to measure differential diffusion rates in minerals, or fission-track techniques. Before 199