The Mencué Batholith: Permian episodic arc-related magmatism in the western North Patagonian Massif, Argentina

Gregori, Daniel Alfredo; Strazzere, Leonardo; Barros, Mercedes Virginia; Benedini, Leonardo; Marcos, Paulo; Kostadinoff, José

doi:10.1080/00206814.2019.1710865

Cited by 15 publications

(8 citation statements)

References 42 publications

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“…In the western NPM, most of the plutons yielded Cisuralian U-Pb in zircon ages and were assigned to the Mamil Choique Formation, Comallo Granite, Piedra del Águila Granite and Mencué Batholith (e.g. Pankhurst et al 2006;López de Luchi & Cerredo, 2008;Varela et al 2009Varela et al , 2015Gregori et al 2020). In the central and eastern NPM, ages of Permian plutons and lavas are mostly constrained between the Guadalupian and Lopingian (Wuchiapingian) and correspond to the La Esperanza, Yaminué, Navarrete and Ramos Mexía complexes (Pankhurst et al 2006(Pankhurst et al , 2014Martínez Dopico et al 2017, 2019Lopez de Luchi et al 2020).…”

Section: C the Permian To Middle Triassic Stratigraphic Framework For...mentioning

confidence: 99%

“…Falco et al 2020), which involved exhumation, basin development, and changes in the geochemistry and isotope composition of magmatic rocks (e.g. Castillo et al 2017;Gregori et al 2020). These rocks were also grouped into the Mencué Batholith in the western NPM (Gregori et al 2020), the La Esperanza Complex (Martínez , and the Los Menucos Group (Luppo et al 2018;Falco et al 2020) in the central NPM, and the Monasa Formation (González et al 2017) and Ramos Mexía Complex in the eastern NPM (Lopez de Luchi et al 2020) (Fig.…”

Section: C the Permian To Middle Triassic Stratigraphic Framework For...mentioning

confidence: 99%

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The origin of Patagonia: insights from Permian to Middle Triassic magmatism of the North Patagonian Massif

et al. 2022

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We conducted a U–Pb–Hf isotope study on zircon crystals from ignimbrites of the Changhsingian to Olenekian (253–248 Ma) Los Menucos Basin in the North Patagonian Massif (NPM), Argentina, in order to evaluate the age and petrogenesis of the magmas. Additionally, a compilation of whole-rock geochemistry and U–Pb–Hf in zircon isotope data for the Permian to Middle Triassic rocks of the NPM, for comparison with our data, was made to assess whether Patagonia would have been an exotic terrane accreted to SW Gondwana during the late Palaeozoic. We interpret the available U–Pb–Hf data to suggest that northern Patagonia experienced eastward arc expansion from the early Permian, about 273 Ma ago. This ∼820 km arc expansion event involved crustal shortening and magmatism with high-silica adakitic affinity, resulting in Hf-isotopic pull-down. At 253 Ma, slab steepening became associated with the coeval emplacement of ignimbrites of the Los Menucos Basin, which involved post-orogenic to intraplate magmatism. During the Middle Triassic, a slab break-off triggered uplift and basaltic underplating, promoting the emplacement of dike swarms with C-type adakitic signature at 246–244 Ma. The Hf isotope data for SW Gondwana for the same period indicate distinct trends that are explained here by differential slab roll-back since the Guadalupian, in a slab-tearing setting. Therefore, Permian to Middle Triassic magmatism is interpreted as having been associated with an eastward-directed proto-Pacific subduction system, which ultimately supports an autochthonous origin for Patagonia.

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Section: C the Permian To Middle Triassic Stratigraphic Framework For...mentioning

confidence: 99%

Section: C the Permian To Middle Triassic Stratigraphic Framework For...mentioning

confidence: 99%

The origin of Patagonia: insights from Permian to Middle Triassic magmatism of the North Patagonian Massif

et al. 2022

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“…1; Varela et al, 2005, Pankhurst et al, 2006Deckart et al, 2014;Gregori et al, 2020, among others). In the western North Patagonian massif, the igneous bodies of the Permian magmatism correspond to the Mamil Choique Formation and were emplaced into the metamorphic rocks of Cushamen Formation (González et al, 2003;Varela et al, 2005;von Gosen, 2009;Marcos et al, 2018;Gregori et al, 2020).…”

Section: Geological Settingmentioning

confidence: 99%

“…Permian magmatism started ca. 290 Ma in the outcrops near the Comallo area (Varela et al, 2005;Pankhurst et al, 2006 andGregori et al, 2020). Therefore, we considered the oldest records for the Permian magmatism (~ 290 Ma) as the probable age for the last stage of the prograde metamorphic evolution (M 2 ) (Fig.…”

Section: Second Prograde Metamorphic Stagementioning

confidence: 99%

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Late Paleozoic geodynamic evolution of the western North Patagonian Massif and its tectonic context along the southwestern Gondwana margin

Marcos

Pivetta

Benedini

et al. 2020

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Linking accretionary orogens with continental crustal growth and stabilization: Lessons from Patagonia

et al. 2023

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The Mencué Batholith: Permian episodic arc-related magmatism in the western North Patagonian Massif, Argentina

Cited by 15 publications

References 42 publications

The origin of Patagonia: insights from Permian to Middle Triassic magmatism of the North Patagonian Massif

The origin of Patagonia: insights from Permian to Middle Triassic magmatism of the North Patagonian Massif

Late Paleozoic geodynamic evolution of the western North Patagonian Massif and its tectonic context along the southwestern Gondwana margin

Linking accretionary orogens with continental crustal growth and stabilization: Lessons from Patagonia

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