A review of the Famatinian Ordovician magmatism in southern South America: evidence of lithosphere reworking and continental subduction in the early proto-Andean margin of Gondwana

Spatial and Depth‐Dependent Variations in Magma Volume Addition and Addition Rates to Continental Arcs: Application to Global CO2 Fluxes since 750 Ma

“…The Ordovician Famatinian arc preserves a flare-up period along the Gondwana margin (e.g., Rapela et al, 2018). Here we focus on a segment exposed in the Sierras Pampeanas of Argentina (28 to 33°S).…”

“…Here we focus on a segment exposed in the Sierras Pampeanas of Argentina (28 to 33°S). The Ordovician Famatinian arc preserves a flare-up period along the Gondwana margin (e.g., Rapela et al, 2018). The Famatinian arc was built into a Cambrian to early Ordovician shallow marine sedimentary succession deposited outboard of the Pampean arc along the Gondwana margin Dahlquist et al, 2008;Pankhurst et al, 1998;Pankhurst et al, 2000).…”

O–H–Sr–Nd isotope constraints on the origin of the Famatinian magmatic arc, NW Argentina

“…The generation of tonalites was related to either partial melting of a Proterozoic lithospheric crust-mantle section (e.g. Pankhurst et al 2000;Dahlquist et al 2008Dahlquist et al , 2013Grosse et al 2011;Castro et al 2012;Rapela et al 2018) or interaction between mafic magmas and supracrustal sedimentary rocks in the crust (Otamendi et al 2012;Ducea et al 2015). The aim of this paper is to review the magma source problem in this arc focusing mainly on O and H isotopes combined with radiogenic isotope data (Sr and Nd) in the same rock set, which can provide valuable insights into this issue.…”

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

“…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). Low energy deep to shallow marine sedimentation was interrupted by high-energy volcaniclastic and volcanicsedimentary processes proximal to volcanic centers (Cisterna et al, 2010a;Cisterna and Coira, 2014).…”

“…The Famatinian belt is a subduction-related continental margin orogen, which developed at the southwestern proto-margin of Gondwana during the Early Paleozoic and is presently widely- Here, the Famatinian Orogen is characterized by a wide (>300 km) Ordovician magmatic belt, J o u r n a l P r e -p r o o f that comprises voluminous metaluminous magmatism in the arc zone to the west and predominant peraluminous batholiths in the back arc zone to the east (Pankhurst et al, 2000;Rapela et al, 2018), and extensive high temperature regional metamorphism and ductile deformation at exposed mid-crustal levels (Otamendi et al 2008;Larrovere et al 2011Larrovere et al , 2020.…”