New insights into petrogenesis of Miocene magmatism associated with porphyry copper deposits of the Andean Pampean flat slab, Argentina

Carrasquero, Silvia Irene; Rubinstein, Nora Alicia; Gómez, Anabel; Chiaradia, Massimo; Fontignie, Denis; Valencia, Víctor A.

doi:10.1016/j.gsf.2017.10.009

Cited by 15 publications

(9 citation statements)

References 45 publications

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“…16 Ma). Major exhumation in the Frontal Cordillera indicated by our data is slightly younger than the onset of the main deformation phase in the Aconcagua fold‐and‐thrust belt, which occurred at 20 Ma (Ramos et al, 2002), and coincident with the migration of the calcalkaline volcanic‐arc axis between ~17 and 16 Ma (Carrasquero et al, 2018) from west (Farellones Fm., 23–17 Ma, Charrier et al, 2002; Nyström et al, 2003) to east (Aconcagua Volcanic Complex, 15.8–8 Ma, Ramos et al, 1996) across the Principal Cordillera. The eastward volcanic‐arc migration coincides with the end of contractional deformation in the northern Aconcagua fold‐and‐thrust belt (Cegarra & Ramos, 1996).…”

Section: Discussionmentioning

confidence: 61%

Detrital Thermochronology Reveals Major Middle Miocene Exhumation of the Eastern Flank ofthe Andes That Predates the PampeanFlat Slab (33°–33.5°S)

et al. 2020

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The Cordón del Plata and Cordón del Portillo (32.6°-33.8°S) are the portions of the Frontal Cordillera that straddle the transition zone between the Pampean flat-slab subduction segment to the north and the normal subduction segment to the south. A complete understanding of how the Frontal Cordillera developed is necessary in order to evaluate different tectonic models for the Andes along with their relation to subduction dynamics and contractional upper-crustal deformation. Detrital apatite fission track thermochronology of modern river sediments that drain the eastern and western slopes of the Cordón del Plata and the northern Cordón del Portillo provides constraints on regional exhumation histories. AFT data from each catchment typically contain multiple age peaks, but all have a prominent 15.3-17 Ma age peak. One catchment, the Las Tunas River has a unimodal distribution at 17.0 ± 1.1 Ma, with a confined track length distribution indicative of rapid cooling at that time. These results, combined with provenance analysis in the adjacent Cacheuta Basin, indicate significant early to middle Miocene (~16 Ma) exhumation in the Cordón del Plata and the northern sector of the Cordón del Portillo. Exhumation related to rock uplift occurred prior to the~11 Ma onset of a flat slab geometry at these latitudes, but immediately after the main east vergent contractional event in the adjacent Principal Cordillera. Such Frontal Cordillera exhumation fits in an eastward, youngest to the foreland sequence of deformation of the different morphostructural Andean units at~33°-34°S, arguing against the recently proposed west vergent orogenic system at these latitudes.

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Section: Discussionmentioning

confidence: 61%

Detrital Thermochronology Reveals Major Middle Miocene Exhumation of the Eastern Flank ofthe Andes That Predates the PampeanFlat Slab (33°–33.5°S)

et al. 2020

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“…This episodic flat sudbuction regime is well represented in the geologic record by tectonic uplift, arc migration (rollback), foreland deformation and the formation of pull-apart basins, as well as by prolific adakite-type magmatism throughout the Andean region [44,67,84,105,120]. Several authors suggested that flat slab subduction and adakite magmas are closely associated both spatially and genetically with the formation of Cu(Mo)-Au(Ag) deposits in the Peruvian and Chilean Andes, as well as the Patagonian metallogenic province [217][218][219]. Figure 15 illustrates close geographic link between Cu-Au mineralization and adakites throughout the Andean magmatic arc.…”

Section: Andean Magmatic Arcmentioning

confidence: 99%

“…This possible duplication of fluid fluxes from the mantle and the evolving magma chamber may potentially explain dramatic vertical extent of copper mineralization at El Teniente as indicated by drilling and geophysical data. Yanacocha [225]; Tres Cruses [219]; Lagunas Norte [226,240]; Quellaveco [228]; Amaro [229]; Cerro Corona [232]; Colosa [233]; Quimsacocha [234]; Junin-Cuellaje [234]; Chaucha [234]; Balsapamba [234]; La Coipa [230]; Los Pelambres [85]; Bajo de la Alumbrera [227]; Escondida [224,238]; El Salvador [222]; El Abra [220]; Paramillos Su [219]; Refugio-Candelaria [223]; Collahuasi-Rosario [231]; El Teniente [218,236,237]; Rio Blanco-Los Bronces [221]; Chuquicamata [235,239].…”

Section: Andean Magmatic Arcmentioning

confidence: 99%

“…The giant Escondida porphyry system (Figure 15) consists of the Escondida (including Escondida Este), Escondida Norte-Zaldivar, Pampa Escondida and the smaller Baker and Pinta Verde deposits, which together combine for a resource of 25 Gt grading around 0.5-0.6 wt.% Cu (Table 9). The Escondida mining cluster produced 144 million metric tons [219]; Lagunas Norte [226,240]; Quellaveco [228]; Amaro [229]; Cerro Corona [232]; Colosa [233]; Quimsacocha [234]; Junin-Cuellaje [234]; Chaucha [234]; Balsapamba [234]; La Coipa [230]; Los Pelambres [85]; Bajo de la Alumbrera [227]; Escondida [224,238]; El Salvador [222]; El Abra [220]; Paramillos Su [219]; Refugio-Candelaria [223]; Collahuasi-Rosario [231]; El Teniente [218,236,237]; Rio Blanco-Los Bronces [221]; Chuquicamata [235,239].…”

Section: Andean Magmatic Arcmentioning

confidence: 99%

“…Variations of Sr/Y versus Y (ppm) in igneous rocks associated with porphyry Cu-Au-Mo (triangles) and epithermal Au-Ag (circles) deposits in the Andean magmatic arc. Data sources: Yanacocha [225]; Tres Cruses[219]; Lagunas Norte[226,240]; Quellaveco[228]; Amaro[229]; Cerro Corona[232]; Colosa[233]; Quimsacocha[234]; Junin-Cuellaje[234]; Chaucha[234]; Balsapamba[234]; La Coipa[230]; Los Pelambres[85]; Bajo de la Alumbrera[227]; Escondida[224,238]; El Salvador[222]; El Abra[220]; Paramillos Su[219]; Refugio-Candelaria[223]; Collahuasi-Rosario[231]; El Teniente[218,236,237]; Rio Blanco-Los Bronces[221]; Chuquicamata[235,239].…”

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Adakites, High-Nb Basalts and Copper–Gold Deposits in Magmatic Arcs and Collisional Orogens: An Overview

et al. 2022

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Adakites are Y- and Yb-depleted, SiO2- and Sr-enriched rocks with elevated Sr/Y and La/Yb ratios originally thought to represent partial melts of subducted metabasalt, based on their association with the subduction of young (<25 Ma) and hot oceanic crust. Later, adakites were found in arc segments associated with oblique, slow and flat subduction, arc–transform intersections, collision zones and post-collisional extensional environments. New models of adakite petrogenesis include the melting of thickened and delaminated mafic lower crust, basalt underplating of the continental crust and high-pressure fractionation (amphibole ± garnet) of mantle-derived, hydrous mafic melts. In some cases, adakites are associated with Nb-enriched (10 ppm < Nb < 20 ppm) and high-Nb (Nb > 20 ppm) arc basalts in ancient and modern subduction zones (HNBs). Two types of HNBs are recognized on the basis of their geochemistry. Type I HNBs (Kamchatka, Honduras) share N-MORB-like isotopic and OIB-like trace element characteristics and most probably originate from adakite-contaminated mantle sources. Type II HNBs (Sulu arc, Jamaica) display high-field strength element enrichments in respect to island-arc basalts coupled with enriched, OIB-like isotopic signatures, suggesting derivation from asthenospheric mantle sources in arcs. Adakites and, to a lesser extent, HNBs are associated with Cu–Au porphyry and epithermal deposits in Cenozoic magmatic arcs (Kamchatka, Phlippines, Indonesia, Andean margin) and Paleozoic-Mesozoic (Central Asian and Tethyan) collisional orogens. This association is believed to be not just temporal and structural but also genetic due to the hydrous (common presence of amphibole and biotite), highly oxidized (>ΔFMQ > +2) and S-rich (anhydrite in modern Pinatubo and El Chichon adakite eruptions) nature of adakite magmas. Cretaceous adakites from the Stanovoy Suture Zone in Far East Russia contain Cu–Ag–Au and Cu–Zn–Mo–Ag alloys, native Au and Pt, cupriferous Ag in association witn barite and Ag-chloride. Stanovoy adakites also have systematically higher Au contents in comparison with volcanic arc magmas, suggesting that ore-forming hydrothermal fluids responsible for Cu–Au(Mo–Ag) porphyry and epithermal mineralization in upper crustal environments could have been exsolved from metal-saturated, H2O–S–Cl-rich adakite magmas. The interaction between depleted mantle peridotites and metal-rich adakites appears to be capable of producing (under a certain set of conditions) fertile sources for HNB melts connected with some epithermal Au (Porgera) and porphyry Cu–Au–Mo (Tibet, Iran) mineralized systems in modern and ancient subduction zones.

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Müller¹,

Groves²

2018

Potassic Igneous Rocks and Associated Gold-Copper Mineralization

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New insights into petrogenesis of Miocene magmatism associated with porphyry copper deposits of the Andean Pampean flat slab, Argentina

Cited by 15 publications

References 45 publications

Detrital Thermochronology Reveals Major Middle Miocene Exhumation of the Eastern Flank ofthe Andes That Predates the PampeanFlat Slab (33°–33.5°S)

Detrital Thermochronology Reveals Major Middle Miocene Exhumation of the Eastern Flank ofthe Andes That Predates the PampeanFlat Slab (33°–33.5°S)

Adakites, High-Nb Basalts and Copper–Gold Deposits in Magmatic Arcs and Collisional Orogens: An Overview

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