Abstract
Metal enrichment to ore grade is the ultimate outgrowth of large-scale and long-term fractionation processes of the thermally driven and unique water-cooled geological evolution of the Earth. Silicic magmatism along convergent margins is the most important lithospheric fractionation process for the formation of the continental crust and porphyry/intrusion-related ore deposits. Reconnaissance microanalysis of melt inclusions from Central Andean porphyry systems refines a metallogenic model for copper–gold and tin porphyry mineralization. Magmatic mixing and early exsolution of a fluid phase are important ingredients for porphyry Cu–Au systems in association with silicic rocks of moderate levels of fractionation (such as diorites and monzonites), whereas extended magmatic fractionation with late-stage fluid evolution characterize lithophile-element-enriched tin porphyry systems.
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Received: 25 June 1999 / Accepted: 11 January 2000
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Lehmann, B., Dietrich, A. & Wallianos, A. From rocks to ore. Int Journ Earth Sciences 89, 284–294 (2000). https://doi.org/10.1007/s005310000085
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DOI: https://doi.org/10.1007/s005310000085