@article{0777656ca09c4fe1bf4d902a78c58bbf,
title = "Ages and isotope evolution of the Agua Rica Cu-Au porphyry-epithermal deposit, NW Argentina",
abstract = "The link between porphyry-epithermal deposits and continental-arc magmatism is widely accepted, but in flat-slab settings the source of metals is still debated. The Central Andes region hosts numerous important mineral deposits within the flat-subduction zone including the world-class Agua Rica Cu-Au (Mo) porphyry-epithermal deposit, which is associated with the Farall{\'o}n Negro Volcanic Complex. The suite of mineralization at Agua Rica includes a porphyry-Cu phase, an associated epithermal assemblage and a supergene enrichment overprint. The main mineralization is considered to be related to the Trampeadero and Seca Norte dacite porphyry intrusions, for which U-Pb SHRIMP zircon ages are 6.09 ± 0.17 and 5.81 ± 0.32 Ma to 5.41 ± 0.25 respectively. Rhenium-Os dating of pyrite from the Trampeadero porphyry yielded an isochron with an age of 5.85 ± 0.42 Ma, and molybdenite yielded a model age of 5.61 ± 0.03 Ma. The Seca Norte body was responsible for the main porphyry-style mineralization, while the older Trampeadero porphyry served as a host rock. Magmatic-hydrothermal activity at Agua Rica commenced at approximately the same time as it was ending in other parts of the volcanic complex. Pb isotope signatures of sulfide samples from Agua Rica indicate a significant addition of crustal material to a mantle source. Neogene magmatism in the area is likely related to the subduction of the Juan Fern{\'a}ndez Ridge, which was subjacent to the deposit by the time of the porphyry intrusions. Upper crustal MASH (mixing, assimilation, storage, and homogenization) in the melting zone above the slab is inferred as the source of the shallow magma reservoir beneath the Farall{\'o}n Negro Volcanic Complex.",
keywords = "Agua Rica, Cu-Au porphyry, Epithermal, Farall{\'o}n Negro Volcanic Complex, Pb isotopes, Re-Os isotopes, U-Pb SHRIMP",
author = "Borba, {Maur{\'i}cio L.} and Tassinari, {Colombo C.G.} and Jason Kirk and Joaquin Ruiz",
note = "Funding Information: The Brazilian National Council for Scientific and Technological Development supported this study (grant CNPq 142827/2011-8 and CNPq 201916/2014-2 and as part of the project: “Geologia Isot{\'o}pica aplicada no estudo de processos tect{\^o}nicos e metalogen{\'e}ticos no tempo geol{\'o}gico”, grant CNPq 302962/2010-7). We would like to thank the Minera Agua Rica team for help in the field and sampling, special thanks to geologist Pedro Ruiz. We are also thankful to Minera Alumbrera Ltd. team, mostly to geologists Ariana Carrazana and Julio Bruna and particularly to the technician V{\'i}ctor Acosta, for helping with the samples. We are also thankful to Dr. Marianne Landtwing, for sharing Agua Rica detailed maps and reports. The authors are also thankful to the isotope laboratory teams at the University of S{\~a}o Paulo and the University of Arizona, especially to Dr. Kei Sato, Rodrigo Azzi Silva and Mark Baker. Funding Information: The Brazilian National Council for Scientific and Technological Development supported this study (grant CNPq 142827/2011-8 and CNPq 201916/2014-2 and as part of the project: ?Geologia Isot?pica aplicada no estudo de processos tect?nicos e metalogen?ticos no tempo geol?gico?, grant CNPq 302962/2010-7). We would like to thank the Minera Agua Rica team for help in the field and sampling, special thanks to geologist Pedro Ruiz. We are also thankful to Minera Alumbrera Ltd. team, mostly to geologists Ariana Carrazana and Julio Bruna and particularly to the technician V?ctor Acosta, for helping with the samples. We are also thankful to Dr. Marianne Landtwing, for sharing Agua Rica detailed maps and reports. The authors are also thankful to the isotope laboratory teams at the University of S?o Paulo and the University of Arizona, especially to Dr. Kei Sato, Rodrigo Azzi Silva and Mark Baker. We are thankful to Dr. Chris Eastoe for his review on the early version of the manuscript and for his suggestions and clarifications in the text. The manuscript benefitted from reviews by Dr. Fernando Tornos e Dr. Albrecht von Quadt that lead to significant improvements and we are thankful to them. Publisher Copyright: {\textcopyright} 2020 Elsevier B.V.",
year = "2020",
month = apr,
doi = "10.1016/j.oregeorev.2020.103395",
language = "English (US)",
volume = "119",
journal = "Ore Geology Reviews",
issn = "0169-1368",
publisher = "Elsevier B.V.",
}