Petrological, geochemical, isotopic, and geochronological constraints for the Late Devonian–Early Carboniferous magmatism in SW Gondwana (27–32°LS): an example of geodynamic switching

Dahlquist, Juán A.; Alasino, Pablo H.; Basei, Miguel Ângelo Stipp; Cámera, Matías M. Morales; Grande, Marcos Simón Macchioli; Neto, Mário da Costa Campos

doi:10.1007/s00531-018-1615-9

Cited by 54 publications

(62 citation statements)

References 71 publications

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“…They record three main magmatic events of Palaeozoic age: Early Cambrian (Pampean Orogeny), Ordovician (Famatinian Orogeny) and Late Devonian -Carboniferous (Achalian -Early Gondwanan Magmatism) (e.g. Casquet et al 2018;Dahlquist et al 2018Dahlquist et al , 2019Rapela et al 2018;Weinberg et al 2018).…”

Section: Geological Backgroundmentioning

confidence: 99%

“…Solano et al 2012;Karakas et al 2017). The heat supply that allows partial melting in these zones is provided by mantle upwelling or mafic underplating/intraplating of mafic magmas at the base of the crust (Solano et al 2012;Annen et al 2015;Alasino et al 2017;Dahlquist et al 2018). The generated melts then ascend and are emplaced in the upper crust, causing mass and heat transfer from deeper to shallow levels (Read, 1962;Petford et al 2000;Annen et al 2015;Cruden & Weinberg, 2018).…”

Section: Introductionmentioning

confidence: 99%

“…Achalian -Early Gondwanan magmatism is well preserved in the Sierras Pampeanas within three groups: (i) intracontinental, metaluminous and strongly peraluminous A-type Middle to Upper Devonian batholiths; (ii) metaluminous to peraluminous A-type Carboniferous (Lower Mississippian) isolated plutons and large complexes to the east; and (iii) metaluminous I-type Carboniferous (Lower Mississippian) isolated plutons and large complexes to the west (including Frontal Cordillera) (Dahlquist et al 2018). Group (ii) rocks formed in a retro-arc setting, whereas group (iii) rocks were generated in an arc setting (Alasino et al 2012;Dahlquist et al 2018).…”

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confidence: 99%

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Thermal maturation of a complete magmatic plumbing system at the Sierra de Velasco, Northwestern Argentina

et al. 2020

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The formation of magmatic plumbing systems in the crust involves mass and heat transfer from deep to shallow levels. This process modifies the local geotherm and increases the thermal maturation of the crust, affecting the rheological state of the host rock and the composition of magma. Here, we report a petrological, geochemical, isotopic and geochronological integrated study of the Huaco (~354 Ma) and Sanagasta (~353 Ma, from a new U–Pb zircon age) units from the Carboniferous (Lower Mississippian) Huaco Intrusive Complex, NW Argentina. Similar values of ϵNd t and δ18O, of −3.2 ± 0.7 and +11.2‰ ± 0.3‰ (V-SMOW), respectively, for both units indicate that they shared the same source, as a result of mixing and later homogenization of a crustal component at the Late Devonian (~378 to 366 Ma), with metasomatized mantle-derived melts. Slightly higher contents of TiO2, FeO, MgO, CaO and rare earth elements for the Sanagasta unit in comparison with the Huaco unit suggest an increase in the degree of partial melting, which may have been caused by a higher temperature at the lower crust. In addition, the previous structural model of the Huaco Intrusive Complex points to an increase in thermal maturation in the upper crust, which drives a change in the emplacement style from tabular subhorizontal (Huaco) to vertically elongated (Sanagasta) bodies. Therefore, the evolution of the intrusive complex may reflect a generalized thermal maturation of the complete magmatic column, at both upper and lower crustal levels.

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Section: Geological Backgroundmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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confidence: 99%

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Thermal maturation of a complete magmatic plumbing system at the Sierra de Velasco, Northwestern Argentina

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“…The start and duration of the orogeny remains uncertain in the literature where the views are varied. In the east, estimates suggest that it lasted between 400 and 360 Ma, with peak magmatism between 393 and 360 Ma (e.g., Dahlquist et al, ; López de Luchi et al, ). This age range closely matches estimates found in the west, where Davis et al () placed initial collision of Chilenia and the start of the Chanic Orogen in the middle Devonian.…”

Section: Geology Of the Sierra De Comechingones And The Gcszmentioning

confidence: 99%

“…This was followed after a short 10‐ to 20‐Ma lull by the Ordovician‐Silurian Famatinian Orogen (e.g., Alasino et al, ; Finch et al, , ; Höckenreiner et al, ; Larrovere et al, ; Martino, ; Semenov & Weinberg, ; Whitmeyer & Simpson, ). The third orogen was marked by greenschist facies shear zones in the Devonian‐Carboniferous Chanic or Achalian Orogen (Dahlquist et al, ; Heredia et al, ; Ramos, ; Sims et al, ; Von Gosen & Prozzi, ). These shear zones are generally north‐south trending with reverse, top‐to‐west movement (e.g, Martino, ).…”

Section: Introductionmentioning

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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Contrasting fluoride contents in mountain rivers of the Andean foreland of Argentina: the influence of A-type peraluminous granites

Uran

Larrovere

Pasquini

et al. 2023

Int J Earth Sci (Geol Rundsch)

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Petrological, geochemical, isotopic, and geochronological constraints for the Late Devonian–Early Carboniferous magmatism in SW Gondwana (27–32°LS): an example of geodynamic switching

Cited by 54 publications

References 71 publications

Thermal maturation of a complete magmatic plumbing system at the Sierra de Velasco, Northwestern Argentina

Thermal maturation of a complete magmatic plumbing system at the Sierra de Velasco, Northwestern Argentina

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

Contrasting fluoride contents in mountain rivers of the Andean foreland of Argentina: the influence of A-type peraluminous granites

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