Early Paleozoic accretionary orogenies in NW Argentina: Growth of West Gondwana

Weinberg, Roberto F.; Becchio, Raúl; Farias, Pablo; Suzaño, Néstor; Sola, Alfonso

doi:10.1016/j.earscirev.2018.10.001

Cited by 58 publications

(33 citation statements)

References 202 publications

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“…Previous work has resulted in a model of the first-order deformational, stratigraphic, petrologic characteristics of the Famatinian arc and timespans over which these processes operated (Rapela et al, 2018;Weinberg et al, 2018;Otamendi et al, 2020). These studies suggest a dominantly marine arc with both submarine and subaerial volcanic edifices built over a plutonic plumbing system restricted to the interval 463 ± 4 to 486 ± 7 Ma, with a peak of period of magmatic activity between 468 Ma and 472 Ma (Ducea et al, 2017;Rapela et al, 2018).…”

Section: J O U R N a L P R E -P R O O Fmentioning

confidence: 99%

Upper-crustal architecture and record of Famatinian arc activity in the Sierra de Narváez and Sierra de Las Planchadas, NW Argentina

Lusk

Ratschbacher

Larrovere

et al. 2021

Journal of South American Earth Sciences

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Section: J O U R N a L P R E -P R O O Fmentioning

confidence: 99%

Upper-crustal architecture and record of Famatinian arc activity in the Sierra de Narváez and Sierra de Las Planchadas, NW Argentina

Lusk

Ratschbacher

Larrovere

et al. 2021

Journal of South American Earth Sciences

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“…This has been interpreted as either a 1,000km long passive margin along the western margin of Gondwana (Ježek et al, 1985;Schwartz and Gromet, 2004) or a fore-arc basin (Hauser et al, 2011;Rapela et al, 2007). The onset of subduction turned these sequences into an accretionary prism leading to medium to high-grade schists, gneisses, and migmatites (Weinberg et al, 2018 and references therein).…”

Section: A R T I C L E I N P R E S Smentioning

confidence: 99%

“…The main tectonothermal event registered in the Sierras de Córdoba, during the Pampean orogeny, is the so called M2 (Casquet et al, 2018;Guereschi and Martino, 2014;Rapela et al, 1998). This event was linked to an increase in the P-T conditions, due to crustal shortening with thrusts propagating into the fore-arc (Weinberg et al, 2018), leading to an upper amphibolite to granulite facies metamorphism and anatexis. The anatexis transformed the protoliths (gneisses and schists) into metatexites and diatexites, with associated peraluminous magmatism.…”

Section: A R T I C L E I N P R E S Smentioning

confidence: 99%

Time lag between metamorphism and crystallization of anatectic granites (Córdoba, Argentina)

́Eramo

Esteban

Demartis

et al. 2020

GeA

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SHRIMP and LA-ICP-MS analyses carried out on zircons from the Río de los Sauces granite revealed their metamorphic and igneous nature. The metamorphic zircons yielded an age of 537±4.8 (2σ)Ma that probably predates the onset of the anatexis during the Pampean orogeny. By contrast, the igneous zircons yielded a younger age of 529±6 (2σ)Ma and reflected its crystallization age. These data point to a short time lag of ca. 8Myr between the High Temperature (HT) metamorphic peak and the subsequent crystallization age of the granite. Concordia age of 534±3.8 (2σ)Ma, for both types of zircon populations, can be considered as the mean age of the Pampean HT metamorphism in the Sierras de Córdoba.

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“…The cycle started at ~500 Ma (e.g., Dahlquist et al, ; Pankhurst et al, ; Pankhurst et al, ) with the growth of the Famatinian magmatic arc and development of an extensional backarc (Bahlburg, , and references therein). The backarc was hot from the start, undergoing anatexis already at this time as marked by the oldest zircon U‐Pb ages in Ordovician peraluminous magmatic rocks (e.g., Bahlburg et al, ; Weinberg et al, ; Wolfram et al, ).…”

Section: Geology Of the Sierra De Comechingones And The Gcszmentioning

confidence: 99%

Prolonged Movement on a > 10‐km‐Wide Thrust During Early Paleozoic Orogens in the Gondwana Margin of NW Argentina

et al. 2019

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The >10‐km thick Paleozoic Guacha Corral shear zone in Central Argentina is arguably one of the thickest thrust zones anywhere. It played a key role during the two early Paleozoic orogenies of western Gondwana and currently separates two terranes: one dominated by events related to the >510‐Ma Pampean Orogeny and the other by the <500‐Ma events of the Famatinian Orogeny. The combination of structures and geochronometry suggests that the shear zone was active for over 100 Ma. Thrusting started during migmatization at 520 Ma as recorded by U‐Pb ages in zircon and monazite and was demonstrably active also at 480 and 470 Ma. The age coincidence between Ar plateau ages of muscovite and biotite at 420 Ma in the upper part of the shear zone, and at 405 Ma in the lower part suggests two intense cooling pulses. These are ascribed to thrusting, rapid exhumation, and cooling. Its anomalous width is likely a result of this prolonged kinematic history related to its role in transferring shortening to the Pampean forearc possibly as a basal detachment and later by acting as the main boundary between the Pampean and Famatinian tectonometamorphic terranes. The two low‐temperature shearing events inferred from the Ar ages suggest that deformation continued during the period between the end of the Famatinian cycle at ~440 Ma and the start of the Chanic or Achalian Orogeny and its magmatism after 400 Ma.

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Early Paleozoic accretionary orogenies in NW Argentina: Growth of West Gondwana

Cited by 58 publications

References 202 publications

Upper-crustal architecture and record of Famatinian arc activity in the Sierra de Narváez and Sierra de Las Planchadas, NW Argentina

Upper-crustal architecture and record of Famatinian arc activity in the Sierra de Narváez and Sierra de Las Planchadas, NW Argentina

Time lag between metamorphism and crystallization of anatectic granites (Córdoba, Argentina)

Prolonged Movement on a > 10‐km‐Wide Thrust During Early Paleozoic Orogens in the Gondwana Margin of NW Argentina

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