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

Oriolo, Sebastián; González, Pablo Diego; Renda, Emiliano Manuel; Basei, Miguel Ângelo Stipp; Otamendi, Juan E.; Cordenons, Pablo Damián; Marcos, Paulo; Yoya, María Belén; Justiniano, Carlos A. Ballivián; Suárez, Rodrigo Javier

doi:10.1016/j.gr.2023.05.011

Cited by 16 publications

(13 citation statements)

References 80 publications

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“…Considering all these evolutionary patterns, it is possible to suggest a gradual tectonic switch from a retreating (early middle Devonian) to the beginning of an advancing regime (late Devonian) (Figures 7a and 7b). This earlier timing of the contractional stage contrasts with models that constrained the advancing orogen or collisional setting only after the late Devonian (e.g., Marcos et al, 2020;Oriolo et al, 2023;Pankhurst et al, 2006).…”

Section: Devonian To Early Carboniferous Tectonic-magmatic Evolution ...mentioning

confidence: 57%

“…The oldest Devonian igneous rocks have crystallization ages close to 400 Ma and crop out in the North Patagonian Cordillera (Figure 1b; Pankhurst et al, 2006). Widespread magmatism developed subsequently (395-383 Ma), whereas minor igneous activity occurred close to the Devonian -Carboniferous limit (Oriolo et al, 2023).…”

Section: Geologic Settingmentioning

confidence: 99%

“…In contrast, extensional regimes are linked to retreating orogen stages triggered by steeply dipping oceanic lithosphere subduction. In such a setting, continental arc magmatism record trenchwards migration, crustal thinning and a significant mantle-derived juvenile magmatic input that produces εHf and εNd positive signatures (e.g., Alasino et al, 2012;Collins et al, 2011;Du et al, 2021;Folguera & Ramos, 2011;Gianni et al, 2018;Kemp et al, 2009;Li et al, 2011;Nelson & Cottle, 2018;Oriolo et al, 2023;Wu et al, 2021). Throughout the subduction evolution, each regime can operate at different timescales, from ca.…”

Section: Isotopic Recordmentioning

confidence: 99%

“…Principal Cordillera, Frontal Cordillera, Precordillera, Famatina Range, Pampean Ranges, and San Rafael Block (Figure 1a), while the exposures of the southern segment are mainly distributed in the northwestern Patagonia region (38°30′ to 44°S). In the latter, the Devonian-early Carboniferous basement crops out in the Coastal Cordillera, North Patagonian Cordillera and the western part of the North Patagonian Massif (e.g., Oriolo et al, 2023), encompassing the northern part of the western magmatic arc proposed by Ramos (2008) (Figure 1a). In last years, the increase in the understanding of Devonian and Carboniferous magmatic processes in northwestern Patagonia has been mainly related to geologic, geochronologic, and isotopic contributions (e.g., Hervé et al, 2013;Oriolo et al, 2023;Pankhurst et al, 2006;Rapela et al, 2021).…”

mentioning

confidence: 99%

“…In the latter, the Devonian-early Carboniferous basement crops out in the Coastal Cordillera, North Patagonian Cordillera and the western part of the North Patagonian Massif (e.g., Oriolo et al, 2023), encompassing the northern part of the western magmatic arc proposed by Ramos (2008) (Figure 1a). In last years, the increase in the understanding of Devonian and Carboniferous magmatic processes in northwestern Patagonia has been mainly related to geologic, geochronologic, and isotopic contributions (e.g., Hervé et al, 2013;Oriolo et al, 2023;Pankhurst et al, 2006;Rapela et al, 2021). These contributions are, however, mainly restricted to the Coastal Cordillera and North Patagonian Cordillera, while the western North Patagonian Massif has not been widely explored, and thus, its geologic and geochronologic-isotopic records are unknown in many areas.…”

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confidence: 99%

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Devonian to Early Carboniferous Retreating—Advancing Subduction Switch in the Northwestern Patagonia Accretionary Orogen: U‐Pb and Lu‐Hf Isotopic Insights

Marcos,

Renda,

González

et al. 2023

Tectonics

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In this contribution, we present new early middle Devonian igneous and metaigneous units with a major juvenile magmatic source input in the North Patagonian Massif, which were discovered through U‐Pb and Lu‐Hf zircon analyses. Afterward, we assessed their tectonic implications for northwestern Patagonia and then for southern South America, combining our results with available database information consisting of igneous crystallization ages and isotopic data of the Devonian to early Carboniferous magmatic units, tectonic‐metamorphic analyses, and thermochronologic record. This study allows for distinguishing retreating and advancing subduction switching in northwestern Patagonia (38°30′ to 44°S) and a contrasting coetaneous evolution for basement outcrops exposed further north (27°30′ and 37°30′S). The early middle Devonian (400–380 Ma) northwestern Patagonian magmatism is characterized by widespread magmatism and positive εHf–εNd linked to forearc and backarc magmatism that evolved within a retreating subduction stage. A tectonic switching toward advancing orogeny stage began in the late Devonian, evidenced by a lull in magmatic activity with a negative εHf–εNd trend, possibly contemporaneous with the first tectonic‐metamorphic event in western Patagonia. An early Carboniferous magmatic gap, followed by the subsequent development of the main foliation in the basement during the Carboniferous‐Permian period, denotes the acme of this contractional stage. In contrast, the Devonian period in the northern segment is characterized by mostly negative εHf–εNd values, reverse shear zone activity in the foreland, and an inboard magmatism migration, evidencing a compressive tectonic setting that changed to an extensional configuration in the early Carboniferous with widespread arc magmatism development.

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Section: Devonian To Early Carboniferous Tectonic-magmatic Evolution ...mentioning

confidence: 57%

Section: Geologic Settingmentioning

confidence: 99%

Section: Isotopic Recordmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Devonian to Early Carboniferous Retreating—Advancing Subduction Switch in the Northwestern Patagonia Accretionary Orogen: U‐Pb and Lu‐Hf Isotopic Insights

Marcos,

Renda,

González

et al. 2023

Tectonics

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The South American Transition Zone

Hermógenes de Mendonça,

Michaux,

Ebach

2024

SpringerBriefs in Evolutionary Biology

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Identifying crustal contributions in the Patagonian Chon Aike Silicic Large Igneous Province

Foley,

Putlitz,

Baumgartner

et al. 2023

Contrib Mineral Petrol

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The volcanic rocks of the Chon Aike Silicic Large Igneous Province (CASP) are recognized as magmas dominantly produced by crustal anatexis. Investigating the zircon of the CASP provides an opportunity to gain further insight into geochemical and isotopic differences of the potential magmatic sources (i.e., crust versus mantle), to identify crustal reservoirs that contributed to the felsic magmas during anatexis, and to quantify the contributions of the respective sources. We present a combined zircon oxygen and hafnium isotope and trace element dataset for 16 volcanic units of the two youngest volcanic phases in Patagonia, dated here with LA-ICP-MS U–Pb geochronology at ca. 148–153 Ma (El Quemado Complex, EQC) and ca. 159 Ma (western Chon Aike Formation, WCA). The EQC zircon have 18O-enriched values (δ18O from 7 to 9.5‰) with correspondingly negative initial εHf values (− 2.0 to − 8.0). The WCA zircon have δ18O values between 6 and 7‰ and εHf values ranging between − 4.0 and + 1.5. Binary δ18O-εHf mixing models require an average of 70 and 60% melt derived from partial melting of isotopically distinct metasedimentary basements for the EQC and WCA, respectively. Zircon trace element compositions are consistent with anatexis of sedimentary protoliths derived from LIL-depleted upper continental crustal sources. The overlap between a high heat flux environment (i.e., widespread extension and lithospheric thinning) during supercontinental breakup and a fertile metasedimentary crust was key in producing voluminous felsic volcanism via anatexis following the injection and emplacement of basaltic magmas into the lower crust.

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

Cited by 16 publications

References 80 publications

Devonian to Early Carboniferous Retreating—Advancing Subduction Switch in the Northwestern Patagonia Accretionary Orogen: U‐Pb and Lu‐Hf Isotopic Insights

Devonian to Early Carboniferous Retreating—Advancing Subduction Switch in the Northwestern Patagonia Accretionary Orogen: U‐Pb and Lu‐Hf Isotopic Insights

The South American Transition Zone

Identifying crustal contributions in the Patagonian Chon Aike Silicic Large Igneous Province

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