Abstract
Techniques are now available to obtain high precision age information on a variety of metamorphic minerals such as zircon, garnet, monazite, sphene, rutile, hornblende, micas, apatite and feldspars. These ages provide valuable information on the timing of geologic events and duration of processes. In order to provide a valid interpretation for these mineral ages it is essential to have some knowledge of the closure temperatures. By combining the ages with the closure temperatures and the maximum temperatures reached during metamorphism it is generally possible to decide whether the ages give information on the prograde or retrograde metamorphic path. Quantitative pressure-temperature-time paths of metamorphism can be constructed when age data are combined carefully with temperature, pressure and textural data.
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