Petrochronology is a field of Earth science in which the isotopic and / or elemental composition of a mineral chronometer is interpreted in combination with its age, thus yielding a more synergistic combination of petrology and chronology that can be used to interpret geologic processes. It has recently attracted renewed interest as technologies for mineral analysis have improved. Examples are many, and continue to grow, from the early adoption of U / Th ratios in zircon as an indicator for magmatic vs. igneous crystallization (e.g., Ahrens 1965), to using the Nd isotopic composition in titanite to track source contribution...

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