Geology and petrology of a deep crustal zone from the Famatinian paleo-arc, Sierras de Valle Fértil and La Huerta, San Juan, Argentina

Otamendi, Juan E.; Vujovich, Graciela I.; Rosa, J. de la; Tibaldi, A; Castro, Antonio; Martino, Roberto; Pinotti, Lucio

doi:10.1016/j.jsames.2008.11.007

Cited by 64 publications

(76 citation statements)

References 52 publications

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“…This boundary coincides with basement exposures of high to medium grade metamorphic rocks developed in close association with the Famatinian orogen of Early to Middle Ordovician age (Coira et al, 1982;Rapela et al, 1998Rapela et al, , 2001Otamendi et al, 2008Otamendi et al, , 2009Chernicoff et al, 2010). This Ordovician high-grade metamorphic episode is superimposed onto a Pampean metamorphism developed in lower metamorphic facies that corresponds to the Pampean deformation (Toselli et al, 1996).…”

Section: Southern Sectorsupporting

confidence: 53%

“…The western boundary has two distinct segments: a northern sector (18 • -26 • SL), where it is based on indirect evidence because the extensive Cenozoic volcanic and sedimentary cover with isolated patches of basement preserved in upper crustal levels (Coira et al, 1999), and a southern sector (26 • -32 • SL) where the lower crustal levels are exposed and there is striking evidence of a discontinuity (Introcaso et al, 2004;Otamendi et al, 2009).…”

Section: Western Boundarymentioning

confidence: 99%

“…These shear zones are bounding the northern domain of Neoproterozoic-Cambrian age, the southern domain of high to medium grade metamorphism of Cambrian age, and a western domain in the Sierra de San Luis of Ordovician age (Martino, 2003). Some sectors, such as the southern end of the Sierra de Comechingones, had important reactivations in Devonian times associated with the docking of Chilenia (Otamendi et al, 2009).…”

Section: Pampean Orogenmentioning

confidence: 99%

“…This is a first-order regional-scale petrological feature of the Ordovician arc, where an I-type dominated plutonic belt along side of an S-type dominated belt were developed (see Toselli et al, 1996;Rossi et al, 2002). Within the Sierras de Famatina, Los Llanos-Chepes-Ulapes, and Valle Fértil-La Huerta, the predominant igneous rocks are calc-alkaline metaluminous I-type granitoids, whereas weakly or strongly peraluminous felsic granitoids appear subordinate (Toselli et al, 1996;Pankhurst et al, 1998;Otamendi et al, 2009). The opposite case occurs in other ranges among which Sierras of Fiambalá, Capillita, Zapata and, in part, Velasco are outstanding examples (Toselli et al, 1996;Rossi et al, 2002).…”

Section: Famatinian Orogenmentioning

confidence: 99%

See 3 more Smart Citations

Pampia: A large cratonic block missing in the Rodinia supercontinent

Ramos

Vujovich

Martino

et al. 2010

Journal of Geodynamics

155

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Section: Southern Sectorsupporting

confidence: 53%

Section: Western Boundarymentioning

confidence: 99%

Section: Pampean Orogenmentioning

confidence: 99%

Section: Famatinian Orogenmentioning

confidence: 99%

See 2 more Smart Citations

Pampia: A large cratonic block missing in the Rodinia supercontinent

Ramos

Vujovich

Martino

et al. 2010

Journal of Geodynamics

155

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“…At the same time Laurentia rifted away from MARA þ Amazonia in the west (present coordinates), resulting in opening of the Iapetus ocean (Dalziel, 1997) and with development of passive margin sedimentary sequences well preserved along the Appalachian margin of Laurentia and in the Precordillera terrane of western Argentina (e.g., Astini et al, 1995;Thomas and Astini, 1996). Final closure of the Clymene ocean occurred between 530 and 520 Ma as implied by the ages of intermediate p/T Barrovian-type collisional metamorphism and coeval S-type plutonism (Rapela et al, 1998;Rapela et al, 2002;Otamendi et al, 2009) (Fig. 4).…”

Section: The Pampean Orogeny and The Amalgamation Of Sw Gondwanamentioning

confidence: 81%

A history of Proterozoic terranes in southern South America: From Rodinia to Gondwana

Casquet

Rapela

Pankhurst

et al. 2012

Geoscience Frontiers

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The role played by Paleoproterozoic cratons in southern South America from the Mesoproterozoic to the Early Cambrian is reconsidered here. This period involved protracted continental amalgamation that led to formation of the supercontinent Rodinia, followed by Neoproterozoic continental break-up, with the consequent opening of Clymene and Iapetus oceans, and finally continental re-assembly as Gondwana through complex oblique collisions in the Late Neoproterozoic to Early Cambrian. The evidence for this is based mainly on a combination of precise U-Pb SHRMP dating and radiogenic isotope data for igneous and metamorphic rocks from a large area extending from the Rio de la Plata craton in the east to the Argentine Precordillera in the west and as far north as Arequipa in Peru. Our interpretation of the paleogeographical and geodynamic evolution invokes a hypothetical Paleoproterozoic block (MARA) embracing basement ultimately older than 1.7 Ga in the Western Sierras

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Crustal Structure of the Andean Foreland in Northern Argentina: Results From Data‐Integrative Three‐Dimensional Density Modeling

et al. 2018

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Previous thermomechanical modeling studies indicated that variations in the temperature and strength of the crystalline crust might be responsible for the juxtaposition of domains with thin‐skinned and thick‐skinned crustal deformation along strike the foreland of the central Andes. However, there is no evidence supporting this hypothesis from data‐integrative models. We aim to derive the density structure of the lithosphere by means of integrated 3‐D density modeling, in order to provide a new basis for discussions of compositional variations within the crust and for future thermal and rheological modeling studies. Therefore, we utilize available geological and geophysical data to obtain a structural and density model of the uppermost 200 km of the Earth. The derived model is consistent with the observed Bouguer gravity field. Our results indicate that the crystalline crust in northern Argentina can be represented by a lighter upper crust (2,800 kg/m3) and a denser lower crust (3,100 kg/m3). We find new evidence for high bulk crustal densities >3,000 kg/m3 in the northern Pampia terrane. These could originate from subducted Puncoviscana wackes or pelites that ponded to the base of the crystalline crust in the late Proterozoic or indicate increasing bulk content of mafic material. The precise composition of the northern foreland crust, whether mafic or felsic, has significant implications for further thermomechanical models and the rheological behavior of the lithosphere. A detailed sensitivity analysis of the input parameters indicates that the model results are robust with respect to the given uncertainties of the input data.

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Geology and petrology of a deep crustal zone from the Famatinian paleo-arc, Sierras de Valle Fértil and La Huerta, San Juan, Argentina

Cited by 64 publications

References 52 publications

Pampia: A large cratonic block missing in the Rodinia supercontinent

Pampia: A large cratonic block missing in the Rodinia supercontinent

A history of Proterozoic terranes in southern South America: From Rodinia to Gondwana

Crustal Structure of the Andean Foreland in Northern Argentina: Results From Data‐Integrative Three‐Dimensional Density Modeling

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