Reconstruction of the Early Ordovician Famatinian arc through thermobarometry in lower and middle crustal exposures, Sierra de Valle Fértil, Argentina

Tibaldi, A; Otamendi, Juan E.; Cristofolini, Eber A.; Baliani, Ignacio; Walker, B. A.; Bergantz, George W.

doi:10.1016/j.tecto.2012.12.032

Cited by 45 publications

(39 citation statements)

References 61 publications

(110 reference statements)

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“…Consequently, metamorphic conditions of the Cerro Olivo Complex [Lenz et al, 2011] could be explained by arc-related high-grade metamorphism and magmatism followed by the accretion of the Nico Pérez Terrane and the Río de la Plata Craton (Figures 8a and 8b). Similar P-T conditions in arc settings were reported by Tibaldi et al [2013] and Maki et al [2014] in the Famatinian arc (western Sierras Pampeanas) and the Higo metamorphic terrane (central Kyushu), respectively. Likewise, Basei et al [2011a] interpreted a collisional event at 635 ± 10 Ma in the Cerro Olivo Complex.…”

Section: Implications For Western Gondwanasupporting

confidence: 75%

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Timing of deformation in the Sarandí del Yí Shear Zone, Uruguay: Implications for the amalgamation of western Gondwana during the Neoproterozoic Brasiliano‐Pan‐African Orogeny

et al. 2016

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U‐Pb and Hf zircon (sensitive high‐resolution ion microprobe ‐SHRIMP‐ and laser ablation‐inductively coupled plasma‐mass spectrometry ‐LA‐ICP‐MS‐), Ar/Ar hornblende and muscovite, and Rb‐Sr whole rock‐muscovite isochron data from the mylonites of the Sarandí del Yí Shear Zone, Uruguay, were obtained in order to assess the tectonothermal evolution of this crustal‐scale structure. Integration of these results with available kinematic, structural, and microstructural data of the shear zone as well as with geochronological data from the adjacent blocks allowed to constrain the onset of deformation along the shear zone at 630–625 Ma during the collision of the Nico Pérez Terrane and the Río de la Plata Craton. The shear zone underwent dextral shearing up to 596 Ma under upper to middle amphibolite facies conditions, which was succeeded by sinistral shearing under lower amphibolite to upper greenschist facies conditions until at least 584 Ma. After emplacement of the Cerro Caperuza granite at 570 Ma, the shear zone underwent only cataclastic deformation between the late Ediacaran and the Cambrian. The Sarandí del Yí Shear Zone is thus related to the syncollisional to postcollisional evolution of the amalgamation of the Río de la Plata Craton and the Nico Pérez Terrane. Furthermore, the obtained data reveal that strain partitioning and localization with time, magmatism emplacement, and fluid circulation are key processes affecting the isotopic systems in mylonitic belts, revealing the complexity in assessing the age of deformation of long‐lived shear zones.

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Section: Implications For Western Gondwanasupporting

confidence: 75%

“…Similar P‐T conditions in arc settings were reported by Tibaldi et al . [] and Maki et al . [] in the Famatinian arc (western Sierras Pampeanas) and the Higo metamorphic terrane (central Kyushu), respectively.…”

Section: Discussionmentioning

confidence: 99%

Timing of deformation in the Sarandí del Yí Shear Zone, Uruguay: Implications for the amalgamation of western Gondwana during the Neoproterozoic Brasiliano‐Pan‐African Orogeny

et al. 2016

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“…(source data: Tulloch and Challis 44 ; Eberhart-Phillips and Reyners 45 ; Scott, et al 29 ; De Paoli et al 47 . Figure adapted from Tibaldi et al 77 ). ( B ) Schematic cross section of Cordillera Zealandia showing the inferred under-thrust Gondwana margin converted to an eclogitic root following partial melting during a flare-up event, which produced the voluminous WFO and SPS suite magmatism. …”

Section: Crustal Profilementioning

confidence: 99%

Cordillera Zealandia: A Mesozoic arc flare-up on the palaeo-Pacific Gondwana Margin

Milan

Daczko

Clarke

2017

Sci Rep

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Two geochemically and temporally distinct components of the Mesozoic Zealandia Cordilleran arc indicate a shift from low to high Sr/Y whole rock ratios at c. 130 Ma. Recent mapping and a reappraisal of published Sr-Nd data combined with new in-situ zircon Hf isotope analyses supports a genetic relationship between the two arc components. A reappraisal of geophysical, geochemical and P-T estimates demonstrates a doubling in thickness of the arc to at least 80 km at c. 130 Ma. Contemporaneously, magmatic addition rates shifted from ~14 km3/my per km of arc to a flare-up involving ~100 km3/my per km of arc. Excursions in Sr-Nd-Hf isotopic ratios of flare-up rocks highlight the importance of crust-dominated sources. This pattern mimics Cordilleran arcs of the Americas and highlights the importance of processes occurring in the upper continental plates of subduction systems that are incompletely reconciled with secular models for continental crustal growth.

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“…Peak granulite facies metamorphism is spatially associated with the Famatina arc, but different crustal levels are exposed on either side of the Valle Fertil lineament. Andalusite and sillimanite bearing pelitic protoliths east of the Valle Fertil Lineament experienced migmatization (Figure ) at ∼750–900°C at ∼5–7 kbar via the intrusion of mafic and intermediate melts during construction of the Famatina arc [e.g., Hauzenberger et al , ; Büttner et al , ; Murra and Baldo , ; Delpino et al , ; Castro de Machuca et al , ; Otamendi et al , ; Gallien et al , ; Tibaldi et al , ; Larrovere et al , ; Otamendi et al , ; Tibaldi et al , ] and preserve counterclockwise pressure‐temperature paths and near isobaric cooling from peak temperatures [e.g., Hauzenberger et al , ; Delpino et al , ; Otamendi et al , ; Gallien et al , ]. Migmatization occurred at ∼465 Ma, although ages from multiple systems within the high‐grade rocks range from ∼470 to 402 Ma [e.g., Hauzenberger et al , ; Hockenreiner et al , ; Lucassen and Becchio , ; Galindo et al , ; Porcher et al , ; Büttner et al , ; Steenken et al , ; Castro de Machuca et al , ; Steenken et al , ; Gallien et al , ; Varela et al , ] and have been interpreted as cooling from peak conditions or as distinct metamorphic and deformation events.…”

Section: Introductionmentioning

confidence: 99%

Multiple migmatite events and cooling from granulite facies metamorphism within the Famatina arc margin of northwest Argentina

et al. 2014

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The Famatina margin records an orogenic cycle of convergence, metamorphism, magmatism, and extension related to the accretion of the allochthonous Precordillera terrane. New structural, petrologic, and geochronologic data from the Loma de Las Chacras region demonstrate two distinct episodes of lower crustal migmatization. The first event preserves a counterclockwise pressure-temperature path in kyanite-K-feldspar pelitic migmatites that resulted in lower crustal migmatization via muscovite dehydration melting at ∼12 kbar and 868 • C at 461 ± 1.7 Ma. The shape of the pressure temperature path and timing of metamorphism are similar to those of regional midcrustal granulites and suggest pervasive Ordovician migmatization throughout the Famatina margin. One-dimensional thermal modeling coupled with regional isotopic data suggests Ordovician melts remained at temperatures above their solidus for 20-30 Ma following peak granulite facies metamorphism, throughout a time period marked by regional oblique convergence. The onset of synconvergent extension occurred only after regional migmatites cooled beneath their solidus and was synchronous with the cessation of Precordillera terrane accretion at ∼436 Ma. The second migmatite event was regionally localized and occurred at ∼700 • C and 12 kbar between 411 and 407 Ma via vapor saturated melting of muscovite. Migmatization was synchronous with extension, exhumation, and strike-slip deformation that likely resulted from a change in the plate boundary configuration related to the convergence and collision of the Chilenia terrane.

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Reconstruction of the Early Ordovician Famatinian arc through thermobarometry in lower and middle crustal exposures, Sierra de Valle Fértil, Argentina

Cited by 45 publications

References 61 publications

Timing of deformation in the Sarandí del Yí Shear Zone, Uruguay: Implications for the amalgamation of western Gondwana during the Neoproterozoic Brasiliano‐Pan‐African Orogeny

Timing of deformation in the Sarandí del Yí Shear Zone, Uruguay: Implications for the amalgamation of western Gondwana during the Neoproterozoic Brasiliano‐Pan‐African Orogeny

Cordillera Zealandia: A Mesozoic arc flare-up on the palaeo-Pacific Gondwana Margin

Multiple migmatite events and cooling from granulite facies metamorphism within the Famatina arc margin of northwest Argentina

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