Abstract
The Bajo de la Alumbrera porphyry deposit formed at shallow crustal levels (2–3 km) during the emplacement of a cluster of silicic intrusions. Copper-gold-bearing veins and associated potassic, phyllic and propylitic alteration assemblages formed within and around the P2 and P3 group plagioclase-biotite-hornblende-phyric porphyries, with most mineralisation associated with P3. Following on from previous studies (Harris et al., 2005 A.C. Harris, S.D. Golding and N.C. White, Econ. Geol. 100 (2005), pp. 863–886. Full Text via CrossRef | View Record in Scopus | Cited By in Scopus (5)Harris et al., 2005 and Ulrich et al., 2002), we have used multiple radiogenic isotopic techniques (U–Pb, Ar/Ar and (U–Th)/He), together with stable (δD and δ18O) isotopic analyses and fluid inclusion microthermometry to constrain the timing and duration of ore deposition and hydrothermal alteration, and to help infer fluid evolution through the history of hydrothermal activity.
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