The role of magma mixing in the evolution of the Early Paleozoic calc-alkaline granitoid suites. Eastern magmatic belt, Puna, NW Argentina

Suzaño, Néstor; Becchio, Raúl; Sola, Alfonso; Ortíz, Agustín; Nieves, Alexis; Quiroga, Mirta; Fuentes, Gabriela RamÃ­rez

doi:10.1016/j.jsames.2017.02.008

Cited by 20 publications

(12 citation statements)

References 66 publications

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“…Based on the mass balances equation, Suzaño et al (2017) estimated that a mafic proportion of ca. 0.40–0.67 and 0.14–0.35 in the mixtures could generate tonalite‐granodiorite and monzogranite, respectively.…”

Section: Discussionmentioning

confidence: 99%

“…In this model, initially, a dehydration reaction in the descending altered oceanic lithosphere led to release slab components (like incompatible elements) into the overlying enriched mantle, and triggered extensive melting of mantle materials such as the melting of peridotites (Elliott et al, 1997). Some similar cases and interpretations have also been proposed, such as the eastern magmatic belt in Puna, northwestern Argentina (Suzaño et al, 2017), the Sierra Valle Fertil magmatic arc (Otamendi et al, 2009), and the Rahaba intrusive complex in the southeastern Desert of Egypt (Abdel-Karim et al, 2021).…”

Section: Tectonic Implicationsmentioning

confidence: 96%

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Subduction‐related mafic to felsic magmatism in the Xiangpishan concentric calc‐alkaline complex, Northeast Tibetan Plateau

Zou

Deng

et al. 2022

Geological Journal

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The Xiangpishan complex in the Zongwulong‐Qinghainanshan Tectonic Belt, Northeast (NE) Tibetan Plateau, is a composite concentric pluton consisting of a felsic core (granodiorite) surrounded by quartz diorite in the middle to diorite and minor gabbro at the margin with locally less volume of monzogranite. Many dioritic enclaves are unevenly distributed within host granitoids. We evaluate the petrogenesis of the complex by geochemical, geochronological, and Hf isotopic data in tandem with regional data in the belt. The results show that felsic rocks were emplaced during the Late Permian (ca. 262–256 Ma); whilst gabbros yielded a younger age of ca. 249 Ma. As the hybrid phase from mixing between felsic and mafic magmas, enclaves and diorites have analogous ages (ca. 257–254 Ma) to both. Zircons from gabbro and enclaves are marked by higher εHf(t) value up to +1.82; whilst granodiorites have lower εHf(t) value of −5.48, consistent with hybrid diorites possessing intermediate εHf(t) values of −3.14 to 0.34. Furthermore, the quantitative calculation from Mass Balances Modelling suggests that the mass of mafic magma (ca. 67%–79%) is involved to achieve the hybridization. Geochemically, these rocks crystallized from calc‐alkaline magma with different sources, but demonstrated consistent arc‐like signatures, as they are enriched in large‐ion lithophile elements and light rare earth element (LREE), and depleted in high‐ field‐strength elements and heavy rare earth element (HREE). Besides, they present negative Nb–Ta anomalies together with significant P and Ti troughs. Finally, an evolutional model has been proposed that the asthenosphere‐lithosphere interaction played an important role during the emplacement of the complex, where the limited volumes of mantle‐derived melt act as the suppliers of heat and mass (mainly volatile components) to induce partial melting of the juvenile mafic lower crust and mixed (or mingled) with the produced crust‐derived magma during the oceanic subduction, which led to the generation of diorites as well as mafic microgranular enclaves.

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Section: Discussionmentioning

confidence: 99%

Section: Tectonic Implicationsmentioning

confidence: 96%

Subduction‐related mafic to felsic magmatism in the Xiangpishan concentric calc‐alkaline complex, Northeast Tibetan Plateau

Zou

Deng

et al. 2022

Geological Journal

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“…The whole dataset of Famatinian-aged igneous rocks resembles a concave upwards hyperbola with contrasting endmembers, suggesting that mixing, hybridization and/or contamination processes involving mantle-and crustal-derived materials have taken place. Such processes have been proposed by several authors for the Famatinian orogen (Casquet et al 2012;Cristofolini et al 2012;Walker et al 2015;Otamendi et al 2017;Suzaño et al 2017;Rapela et al 2018;Weinberg et al 2018;Morosini et al 2019;Camiletti et al 2020).…”

Section: Leucogranites: Anomalous Isotopic Compositions In the Famatinian Orogenmentioning

confidence: 96%

Shear-assisted water-fluxed melting and AFC processes in the foreland of the Early Paleozoic Famatinian orogen: petrogenesis of leucogranites and pegmatites from the Sierras de Córdoba, Argentina

Demartis

Jung

Hauff

et al. 2021

Int J Earth Sci (Geol Rundsch)

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In the Comechingones pegmatitic field, central Argentina, leucogranite and pegmatite bodies crop out in a relatively narrow (25 × 10 km) belt, and were emplaced synkinematically with the main deformational event of the crustal-scale Guacha Corral shear zone during the Early Ordovician (~ 475 Ma). These leucogranites and pegmatites are geochemically evolved rocks with high silica and alkalis, low Fe 2 O 3 , MgO, TiO 2 and CaO, and high ASI values. The leucogranites display quite variable Sr and Nd isotope compositions (initial 87 Sr/ 86 Sr ratios from 0.7048 to 0.7170, and ε Nd values from + 2.0 to − 3.1), some of which do not overlap with almost any other pre-Famatinian rock from the Sierras de Córdoba. The major and trace element geochemistry and the particular Sr and Nd isotope compositions of the leucogranites are here explained by the following processes: (1) water-fluxed partial melting of amphibolites at relatively low P-T conditions generating currently unexposed granodioritic melts with unradiogenic 87 Sr/ 86 Sr ratios and radiogenic ε Nd values; (2) fractionation of mostly plagioclase and monazite leading to compositions close to the leucogranite melts; and (3) assimilation of metasedimentary rocks with crustal isotopic signatures, modelled by assimilation and fractional crystallization processes. The major, trace and isotope compositions of the pegmatites suggest a derivation from partial melting of the same metasedimentary protoliths of the Sierras de Córdoba that were assimilated by leucogranite melts. We propose a feedback relationship among deformation, anatexis, magma evolution and mass transfer in the context of such a crustal-scale shear zone in the foreland of the Famatinian orogen.

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“…On top, the Cambrian siliciclastic sediments of the Mesón Group are exposed in a few outcrops in the eastern sector of the central Puna [29,51,52] (Figure 2). The Precambrian and Cambrian units are intruded by metagranitoid rocks of the Ordovician Faja Eruptiva, Oire Formation or Eastern Magmatic Belt [53] and unconformably covered by an Ordovician volcano-sedimentary sequence [29,[54][55][56][57] (Figure 2). Above, the poly-deformed pre-Cambrian and Palaeozoic basement rocks, the Cretaceous-Paleocene syn-and post-rift sedimentary sequence of the Salta Group and the Tertiary siliciclastic and evaporitic deposits of the Pastos Grandes Group related to the Andean broken foreland basin evolution were deposited [25,49,[58][59][60][61][62][63] (Figure 2).…”

Section: Geological Settingmentioning

confidence: 99%

“…New geochronological data for the Tocomar basin units are also provided. The oldest rocks mapped in the Tocomar area are porphyric and equigranular granites and granodiorites with mafic dike intrusions and mylonites that form the so-called Ordovician "Faja eruptiva de la Puna Oriental", "Complejo Eruptivo Oire" [16,29,55,57,78] or "Eastern Magmatic Belt" [53] (Figure 4a). This unit mainly crops out in the north-east sector of the study area forming a high altitude ridge developed at more than 4500 m a.s.l.…”

Section: Stratigraphy Of the Tocomar Areamentioning

confidence: 99%

Geological Map of the Tocomar Basin (Puna Plateau, NW Argentina). Implication for the Geothermal System Investigation

et al. 2020

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This paper presents a detailed geological map at the 1:20,000 scale of the Tocomar basin in the Central Puna (north-western Argentina), which extends over an area of about 80 km2 and displays the spatial distribution of the Quaternary deposits and the structures that cover the Ordovician basement and the Tertiary sedimentary and volcanic units. The new dataset includes litho-facies descriptions, stratigraphic and structural data and new 234U/230Th ages for travertine rocks. The new reconstructed stratigraphic framework, along with the structural analysis, has revealed the complex evolution of a small extensional basin including a period of prolonged volcanic activity with different eruptive centres and styles. The geological map improves the knowledge of the geology of the Tocomar basin and the local interplay between orogen-parallel thrusts and orogen-oblique fault systems. This contribution represents a fundamental support for in depth research and also for encouraging geothermal exploration and exploitation in the Puna Plateau region.

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The role of magma mixing in the evolution of the Early Paleozoic calc-alkaline granitoid suites. Eastern magmatic belt, Puna, NW Argentina

Cited by 20 publications

References 66 publications

Subduction‐related mafic to felsic magmatism in the Xiangpishan concentric calc‐alkaline complex, Northeast Tibetan Plateau

Subduction‐related mafic to felsic magmatism in the Xiangpishan concentric calc‐alkaline complex, Northeast Tibetan Plateau

Shear-assisted water-fluxed melting and AFC processes in the foreland of the Early Paleozoic Famatinian orogen: petrogenesis of leucogranites and pegmatites from the Sierras de Córdoba, Argentina

Geological Map of the Tocomar Basin (Puna Plateau, NW Argentina). Implication for the Geothermal System Investigation

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