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The Montecristo mining district, northern Chile: the relationship between vein‑like magnetite‑(apatite) and iron oxide‑copper–gold deposits
dc.contributor.author | Mateo, Laura | |
dc.contributor.author | Delgado Huertas, Antonio | |
dc.date.accessioned | 2023-05-17T06:37:03Z | |
dc.date.available | 2023-05-17T06:37:03Z | |
dc.date.issued | 2023-03-23 | |
dc.identifier.citation | Mateo, L., Tornos, F., Hanchar, J.M. et al. The Montecristo mining district, northern Chile: the relationship between vein-like magnetite-(apatite) and iron oxide-copper–gold deposits. Miner Deposita (2023). [https://doi.org/10.1007/s00126-023-01172-0] | es_ES |
dc.identifier.uri | https://hdl.handle.net/10481/81592 | |
dc.description.abstract | The Montecristo district, northern Chile, is one of the few places worldwide where there is a direct relationship between magnetite-(apatite) (MtAp) mineralization and iron oxide-copper–gold (IOCG) mineralization. The MtAp mineralization includes Ti-poor magnetite, fluorapatite, and actinolite and is crosscut and partially replaced by a younger IOCG mineralization that includes a second generation of actinolite and magnetite with quartz, chalcopyrite, pyrite, and molybdenite. The MtAp stage at Montecristo is interpreted as the crystallized iron-rich melts that used the pre-existing structures of the Atacama Fault System as conduits. These rocks later acted as a trap for hydrothermal IOCG mineralization. Geochronology data at Montecristo indicate that the host diorite (U–Pb zircon 153.3 ± 1.8 Ma, 2-sigma), MtAp mineralization (40Ar-39Ar in actinolite, 154 ± 2 Ma and 153 ± 4 Ma, 2-sigma), and the IOCG event (Re-Os on molybdenite, 151.8 ± 0.6 Ma, 2-sigma) are coeval within error and took place in a time span of less than 3.4 Ma. The εHfi and εNdi values of the host diorite are + 8.0 to + 9.8 and + 4.3 to + 5.4, respectively. The whole-rock 87Sr/86Sri values of the IOCG mineralization (0.70425 to 0.70442) are in the lower end of those of the MtAp mineralization (0.70426–0.70629). In contrast, εNdi values for the IOCG mineralization (+ 5.4 and + 5.7) fall between those of the MtAp rocks (+ 6.6 to + 7.2) and the host diorite, which suggests that the IOCG event was related to fluids having a more crustal Nd (εNdi < + 5.7) composition than the MtAp mineralization. This likely reflects the mixing of Nd from the MtAp protolith and a deep magmatic-hydrothermal source, very likely an unexposed intrusion equivalent to the host diorite. Sulfur isotope compositions (δ34S, + 0.3 to + 3.4‰) are consistent with a magmatic source. | es_ES |
dc.description.sponsorship | NSERC discovery grant to J.M. Hanchar (RGPIN/004649-2015) | es_ES |
dc.description.sponsorship | RTI2018-099157-A-I00 (MCI/AEI/FEDER, UE) research grant to F. Tornos. | es_ES |
dc.language.iso | eng | es_ES |
dc.publisher | Springer Nature | es_ES |
dc.rights | Atribución 4.0 Internacional | * |
dc.rights.uri | http://creativecommons.org/licenses/by/4.0/ | * |
dc.subject | MtAp deposits | es_ES |
dc.subject | IOCG deposits | es_ES |
dc.subject | Mineral chemistry | es_ES |
dc.subject | Isotope geochemistry | es_ES |
dc.subject | Geochronology | es_ES |
dc.subject | Coastal Cordillera Andes | es_ES |
dc.subject | Chile | es_ES |
dc.title | The Montecristo mining district, northern Chile: the relationship between vein‑like magnetite‑(apatite) and iron oxide‑copper–gold deposits | es_ES |
dc.type | journal article | es_ES |
dc.rights.accessRights | open access | es_ES |
dc.identifier.doi | 10.1007/s00126-023-01172-0 | |
dc.type.hasVersion | VoR | es_ES |