Petrogenesis of Early Paleozoic basalts and gabbros in the western Cuyania terrane: Constraints on the tectonic setting of the southwestern Gondwana margin (Sierra del Tigre, Andean Argentine Precordillera)

González-Menéndez, L.; Gallastegui, G.; Cuesta, A.; Heredia, N.; Rubio-Ordóñez, A.

doi:10.1016/j.gr.2012.09.011

Cited by 36 publications

(39 citation statements)

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“…10a). This geochemistry is quite similar to that of the Late Ordovician basalts and gabbros from the Western Precordillera (data from González-Menéndez et al, 2013). Some differences are the higher positive Ba and negative K anomalies and lower Rb contents of some of the Precordilleran basalts and gabbros (Fig.…”

Section: Normalized Trace Elements and Further Comparisons With Othersupporting

confidence: 78%

“…The geochemistry also indicates that the most probable source of the El Planchón basic clasts is the Late Ordovician basalts and gabbros of the Western Precordillera mafic belt (Haller and Ramos, 1984;Davis et al, 2000;Ramos et al, 2000;González Menéndez et al, 2013). Both have tholeiitic to transitional geochemistry probably related to extensional continental or continental-oceanic transitional settings (OIB/Withinplate/ MORB).…”

Section: Geochemical Relationships Among the Different Clastsmentioning

confidence: 97%

“…In order to compare the Del Ratón and El Plachón basic clasts with known compositions from mafic igneous rocks located nearby we have included in some of the plots the composition of Late Ordovician basalts and gabbros from the Western Precordillera (Sierra del Tigre basalts and gabbros; data from González-Menéndez et al, 2013). As observed in the figures 7 b and c, the El Planchón basic clasts are similar to the mafic compositions of the Western Precordillera basalts and gabbros in Zr+Nb+Ce+Y contents, as well as in ASI and Na 2 O+K 2 O/CaO values.…”

Section: Rock Classificationmentioning

confidence: 99%

“…The studied rock clasts show some scatter in the La vs. Nb diagram but two groups can be established ( (Sun and McDonough, 1989). Data from the Del Ratón and El Planchón conglomerates are plotted together with, basalts and gabbros from the Western Precordillera (González Menéndez et al, 2013), A-type granites from the Sierras Pampeanas (Dahlquist et al, 2010;Alasino et al, 2012), calc-alkaline granitoids from the Frontal Cordillera (Gregori et al, 1996), and average contents of the upper continental crust (Rollingson, 1993 and references therein. a) Basic clasts from the Del Ratón and El Planchón conglomerates.…”

Section: Outstanding Trace Element Features and Ree Datamentioning

confidence: 99%

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Origin and provenance of igneous clasts from late Palaeozoic conglomerate formations (Del Ratón and El Planchón) in the Andean Precordillera of San Juan, Argentina

Gallastegui

González-Menéndez

Rubio-Ordóñez

et al. 2014

Journal of Iberian Geology

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Late Palaeozoic conglomerate formations (Del Ratón and El Planchón) from the Andean Precordillera (Argentina) were studied to unravel their age, composition and provenance. The conglomerates from the Del Ratón Formation are formed by igneous clasts of acid, intermediate and basic compositions (volcanic and plutonic). Laser Ablation (ICP-MS) zircon U-Pb study has yielded an age of 348±2 Ma (late Tournaisian) for the crystallization of a granitic clast, interpreted as a maximum deposition age for the Del Ratón Formation. Geochemistry of these clasts (high LILE/HFSE and La/Yb ratios, negative Nb-Ta anomalies) suggests a calc-alkaline batholithic source, probably located along the Andean Frontal Cordillera currently to the west, where similar calc-alkaline igneous rocks have been described. The El Planchón Formation overlies the Del Ratón Formation and, in the studied conglomerates, there are only igneous clasts of mafic composition (volcanic/subvolcanic). These mafic clasts have a very similar petrography and geochemistry to the Late Ordovician mafic igneous rocks of the Western Precordillera (low LILE/HFSE and La/Yb ratios, no negative Nb-Ta anomalies). Therefore we suggest that the El Planchón conglomerate clasts were probably delivered mainly from northern sources within the Precordillera terrane. This change in clast provenance is tentatively related to a shift in mountain uplift from the Frontal Cordillera (in the west) to the Precordillera (in the east) after the early Visean.Keywords: Late Palaeozoic, conglomerates, igneous clasts, U-Pb ICP-MS geochronology, sedimentary provenance, Gondwana, Andes Resumen Las formaciones conglomeráticas del Paleozoico superior (Del Ratón y El Planchón) de la Precordillera Andina (Argentina) fueron estudiadas con el fin de determinar su edad, composición y procedencia. Los conglomerados de la Formación Del Ratón están constituidos por clastos de rocas ígneas (volcánicas y plutónicas) ácidas, intermedias y básicas. Un estudio en circones con espectrometría de masas con plasma acoplado por inducción con ablación láser (LA-ICP-MS) proporciona una edad de 348±2 Ma (Tournaisiense superior) para la cristalización de un clasto granítico, que interpretamos como la máxima edad del depósito de la Formación Del Ratón. La geoquímica de los clastos (altas relaciones LILE/HFSE y La/Yb, anomalías negativas de Nb-Ta) sugiere que probablemente derivan de batolitos calcoalcalinos descritos en algunos sectores de la Cordillera Frontal Andina localizada actualmente al oeste. La Formación El Planchón se superpone a la Formación Del Ratón y los clastos estudiados en los conglomerados de esta formación son únicamente de rocas ígneas básicas (subvolcánicas/volcánicas). Estos clastos tienen una petrografía y geoquímica similar a las rocas ígneas máficas del Ordovícico Superior de la Precordillera Occidental (bajas relaciones LILE/HFSE y La/Yb, ausencia de anomalías negativas en Nb-Ta). Por ello nosotros sugerimos que los clastos de los conglomerados de la Formación El Planchón proceden de mat...

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Section: Normalized Trace Elements and Further Comparisons With Othersupporting

confidence: 78%

Section: Geochemical Relationships Among the Different Clastsmentioning

confidence: 97%

Section: Rock Classificationmentioning

confidence: 99%

Section: Outstanding Trace Element Features and Ree Datamentioning

confidence: 99%

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Origin and provenance of igneous clasts from late Palaeozoic conglomerate formations (Del Ratón and El Planchón) in the Andean Precordillera of San Juan, Argentina

Gallastegui

González-Menéndez

Rubio-Ordóñez

et al. 2014

Journal of Iberian Geology

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“…In the northern part and in the continuation of the southern oceanic zone, that separated Chilenia and Cuyania, an intracontinental rift with a thinned continental crust was formed (Fig 11A y B), resulting in a marine basin with passive margins on both sides (González-Menéndez et al, 2013). During the Ordovician, Cuyania joined to Gondwana, giving rise to the Famatinian orogeny, which did not affect the Chilenia Terrane (Frontal Cordillera) where the study area is located (Fig.…”

Section: Structures Of the Andean Cyclementioning

confidence: 99%

Stratigraphy, structure and geodynamic evolution of the Paleozoic rocks in the Cordillera del Viento (37º S latitude, Andes of Neuquén, Argentina)

Giacosa

Allard

Foix

et al. 2014

Journal of Iberian Geology

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The Pre-Andean Paleozoic substrate from the Cordillera del Viento anticline is a polyorogenic basement composed of two groups of preorogenic rocks with different stratigraphy and deformation. The oldest set consists of pre-Late Devonian metasedimentary rocks belonging to the Guaraco Norte Formation. The upper set is formed by the thick volcano-sedimentary sequence of the Carboniferous Andacollo Group. This group is composed from bottom to top of the silicic volcanic rocks of the Arroyo del Torreón Formation (early Carboniferous) and the marine sedimentary rocks of the Huaraco Formation (late Carboniferous) developed in an extensional basin. Both formations are locally separated by minor syn-extensional unconformities.The relationship between the metamorphic rocks of the Guaraco Norte Formation and the volcano-sedimentary sequence of the Andacollo Group is not observed, but we inferred a major angular unconformity associated with the Late Devonian-early Carboniferous Chanic orogeny. The main Chanic structures are tight vertical and subvertical folds with slight W-WSW vergence, formed under low-grade metamorphic conditions, with the development of a pervasive axial-plane cleavage (S1), affected by a disjunctive crenulation cleavage (S2).In the early Permian, during the San Rafael orogeny of the Gondwanan orogenic cycle, deformation occurred under very low-grade to non-metamorphic conditions. The main structures are thrusts and associated folds that are re-folded by the Cordillera del Viento anticline, related to the Andean orogeny. The WNW-oriented and SSW-vergent folds are associated with an incipient axial-plane cleavage in the pyroclastic rocks and pencil lineation in shales.The pre-Andean Paleozoic basement rocks are intruded and unconformably covered by early Permian to Early Triassic? granitoids and silicic volcanic rocks from the Huingancó volcanic-plutonic Complex (equivalent to the Choiyoi Group), establishing the beginning of the Andean orogenic cycle in this region.Keywords: Andes, Paleozoic, Tectonics, Chanic Orogeny, Cordillera del Viento Resumen El sustrato paleozoico pre-andino que aflora en el anticlinal de la Cordillera del Viento, es un basamento poliorogénico que está compuesto por dos conjuntos de rocas preorogénicas con estratigrafía y condiciones de deformación diferentes. El más antiguo tiene una edad devónica superior y está formado por las rocas metasedimentarias de la Formación Guaraco Norte, en tanto que el conjunto superior son las espesas acumulaciones volcano-sedimentarias carboníferas del Grupo Andacollo. Este grupo, integrado en su parte inferior por rocas volcánicas silíceas de la Formación Arroyo del Torreón (Carbonífero inferior) y hacia techo, por las sedimentitas clásticas marinas de la Formación Huaraco (Carbonífero superior) fue desarrollado en el marco de una cuenca extensional y pueden estar separadas localmente por discordancias menores de carácter sin-extensional.Las relaciones entre las rocas metamórficas y la secuencia volcano-sedimentaria del Carbonífero no se ...

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Preliminary Appraisal of a Correlation Between Glaciations and Large Igneous Provinces Over the Past 720 Million Years

Youbi

Ernst

Mitchell

et al. 2021

Large Igneous Provinces

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Petrogenesis of Early Paleozoic basalts and gabbros in the western Cuyania terrane: Constraints on the tectonic setting of the southwestern Gondwana margin (Sierra del Tigre, Andean Argentine Precordillera)

Cited by 36 publications

References 50 publications

Origin and provenance of igneous clasts from late Palaeozoic conglomerate formations (Del Ratón and El Planchón) in the Andean Precordillera of San Juan, Argentina

Origin and provenance of igneous clasts from late Palaeozoic conglomerate formations (Del Ratón and El Planchón) in the Andean Precordillera of San Juan, Argentina

Stratigraphy, structure and geodynamic evolution of the Paleozoic rocks in the Cordillera del Viento (37º S latitude, Andes of Neuquén, Argentina)

Preliminary Appraisal of a Correlation Between Glaciations and Large Igneous Provinces Over the Past 720 Million Years

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