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The establishment of accurate time scales of mineral systems is essential to construct reliable genetic models about their formation. Time scales of fossil mineral systems are directly determined through radiometric dating of different stages of development of the mineral system. In theory, porphyry systems are, among mineral systems, those whose duration can be bracketed with most accuracy and precision, because of the universal occurrence of ore and gangue minerals that can be dated with the high precision U-Pb zircon, Re-Os molybdenite, and 40Ar/39Ar dating techniques.

Time scales of fossil porphyry systems reported in the literature range...

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