Lower Jurassic felsic diatreme volcanism recognized in central Patagonia as evidence of along-strike rift segmentation

Benedini, Leonardo; Pivetta, Cecilia Mariana Pavon; Marcos, Paulo; Gregori, Daniel Alfredo; Barros, Mercedes Virginia; Scivetti, Nicolás; Santos, Anderson Costa dos; Strazzere, Leonardo; Geraldes, Mauro César; Bernabé, Teodoro de Queiroz

doi:10.1016/j.jsames.2020.102705

Cited by 10 publications

(2 citation statements)

References 31 publications

(29 reference statements)

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“…The Paleozoic basement crops out in creeks and low hills, and is covered by Mesozoic and Cenozoic volcanic‐sedimentary deposits in surrounding areas near the Comallo locality (Figures 1b and 2a; Barros et al., 2020; Benedini et at. 2021, 2022). The Cañadón Bonito basement comprises quartz‐mica schists, amphibolites, metadiorites‐metagabbros dikes, orthogneisses, and leucocratic dikes (Figure 2b).…”

Section: Resultsmentioning

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: Resultsmentioning

confidence: 99%

“…The Paleozoic basement crops out in creeks and low hills, and is covered by Mesozoic and Cenozoic volcanic-sedimentary deposits in surrounding areas near the Comallo locality (Figures 1b and 2a; Barros et al, 2020;Benedini et at. 2021Benedini et at.…”

Section: Cañadón Bonitomentioning

confidence: 99%