Sr–Nd isotope data of basement rocks from the northernmost argentine Precordillera and its implications for the early Paleozoic evolution of SW Gondwana margin

Martina, Federico; Astini, Ricardo A.; Pimentel, Márcio Martins

doi:10.1016/j.jsames.2014.08.006

Cited by 2 publications

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“…14). In this context, our ϵ Nd (t) values (þ3.4 to þ8.4, at 418, 454 and 576 Ma), other similar observations (ϵ Nd (t) values þ6.5 to þ7.5 obtained by Davis et al 2000;Kay et al 2005;Martina et al 2014 in the PMUB) and data from the Guarguaraz area in the Argentine Frontal Cordillera (López & Gregori, 2004;López de Azarevich et al 2009) may indicate a common primitive magmatic source with a Grenville affinity. The igneous-sedimentary succession developed on a Grenville-aged crust for the PMUB is suggested by the presence of Mesoproterozoic rocks and equivalent Nd model ages in the Cordón del Portillo and other areas such as the Jagüé-Bonete locality, the Pie de Palo, Umango and Maz ranges, and the San Rafael and Las Matras blocks (e.g.…”

Section: A Assessment Of Crustal Contamination and Mantle Sourcesupporting

confidence: 88%

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The Cuyano proto-ocean between the Chilenia and Cuyania terranes: rifting and plume interaction during the Neoproterozoic – early Palaeozoic evolution of the SW Gondwana margin

et al. 2021

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The Precordillera mafic–ultramafic belt (PMUB), located in central-western Argentina, comprises mafic and ultramafic bodies interlayered and/or in tectonic contact with marine siliciclastic units. Whole-rock, mineral geochemistry and Nd–Sr isotope analyses performed in magmatic rocks suggest a relatively different spatial and temporal evolution along the belt. The southern PMUB (south of 32° S) evolved as an intra-continental rifted margin with an enriched mid-ocean-ridge basalt (E-MORB) tholeiitic to alkaline magmatism, to a proto-ocean basin (the Cuyano proto-ocean) with tholeiitic normal-MORB geochemical signature. Based on neodymium model ages (TDM), the magmatic activity started during the late Neoproterozoic Era and continued into the early Palaeozoic Era. Instead, the northern PMUB (28–32° S) evolved as an intra-continental rifted margin with dominant tholeiitic E-MORB to continental flood basalt (CFB) magmatism during the early Palaeozoic Era. ϵNd values (+3.4 to +8.4), rare earth element trends and high-field-strength element systematics, together with an estimated potential mantle temperature of c. 50–100°C above ambient mantle, suggest the PMUB magmatism derived from an enriched mantle source related to the effect of a rising plume linked to the Iapetus Ocean opening. In particular, TDM estimations of 600–550 Ma agree with reported magmatism in central to southern Appalachians. The magmatism in the PMUB, and those registered in the Neoproterozoic Catoctin Formation and in the Southern Oklahoma Aulacogen in the conjugated Laurentian margin, seem to be contemporaneous, sharing a similar plume-enriched mantle source. In this context, the E-MORB signature identified along the PMUB can be described as a plume-distal ridge tectonic setting over an extended margin.

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Section: A Assessment Of Crustal Contamination and Mantle Sourcesupporting

confidence: 88%

“…2) (Fauqué & Villar, 2003). In addition, estimations from a basic sill for the same locality provided a depleted mantle (DM) Nd model age (T DM ) of 510 Ma (Martina et al 2014).…”

Section: B Previous Geochronological and Geochemical Studies Of The Pmubmentioning

confidence: 99%

The Cuyano proto-ocean between the Chilenia and Cuyania terranes: rifting and plume interaction during the Neoproterozoic – early Palaeozoic evolution of the SW Gondwana margin

et al. 2021

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The mafic-ultramafic belt of the Argentine Precordillera: A geological synthesis

Boedo

Luján

Ariza

et al. 2021

Journal of South American Earth Sciences

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Sr–Nd isotope data of basement rocks from the northernmost argentine Precordillera and its implications for the early Paleozoic evolution of SW Gondwana margin

Cited by 2 publications

References 82 publications

The Cuyano proto-ocean between the Chilenia and Cuyania terranes: rifting and plume interaction during the Neoproterozoic – early Palaeozoic evolution of the SW Gondwana margin

The Cuyano proto-ocean between the Chilenia and Cuyania terranes: rifting and plume interaction during the Neoproterozoic – early Palaeozoic evolution of the SW Gondwana margin

The mafic-ultramafic belt of the Argentine Precordillera: A geological synthesis

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