Petrology and SHRIMP U–Pb zircon geochronology of Cordilleran granitoids of the Bariloche area, Argentina

Castro, Antonio; Moreno‐Ventas, I.; Fernández, Carlos; Vujovich, Graciela I.; Gallastegui, G.; Heredia, N.; Martino, Roberto; Becchio, Raúl; Corretgé, L. G.; Díaz‐Alvarado, Juan; Such, P.; García‐Arias, Marcos; Liu, D.-Y.

doi:10.1016/j.jsames.2011.03.011

Cited by 81 publications

(49 citation statements)

References 52 publications

(79 reference statements)

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“…This geochronologic datum can be used to correlate other tectonic and silicic magmatic processes in the region that complement general genetic models and tectonic processes. The reported age is almost coincident with the age of several Cordilleran-type granodioritediorite intrusions (Castro et al, 2010(Castro et al, , 2011 and andesitic volcanic rocks in the Paso the Indios region (Aragón et al, 2003). Errors are 1-sigma.…”

Section: Discussion and Concluding Remarkssupporting

confidence: 62%

“…The geodynamic environment of southern South America 155 Ma ago showed to the east of Paso de Indios the initial stages of break up of Gondwana (the first phases of seafloor spreading between Antartica and Africa happened about 155 Ma ago, Martin and Hartnady, 1986). Instead, to the west of Paso de Indios, subduction and a magmatic arc was developed at this latitude, documented by the volcanic rocks from the Lago de La Plata group of Taoarcian to Tithonian age (Haller and Lapido, 1980), and the emplacement of the Patagonian Andean Batholith (Pankhurst et al, 1999;Castro et al, 2011). Therefore, the Paso de Indios area represents a transition zone between continental rifting and subduction.…”

Section: Discussion and Concluding Remarksmentioning

confidence: 99%

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Age and composition of granulite xenoliths from Paso de Indios, Chubut province, Argentina

Castro

Aragón

Díaz‐Alvarado

et al. 2011

Journal of South American Earth Sciences

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Section: Discussion and Concluding Remarkssupporting

confidence: 62%

Section: Discussion and Concluding Remarksmentioning

confidence: 99%

Age and composition of granulite xenoliths from Paso de Indios, Chubut province, Argentina

Castro

Aragón

Díaz‐Alvarado

et al. 2011

Journal of South American Earth Sciences

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“…Plain lines and dotted lines represent compositional fields for granitoids and mafic enclave analyses from Gonçalves et al (2014) and Nalini (1997), respectively. Light blue squares are metaluminous cordilleran-type I-type granitoids from North and South Patagonian Batholith (Castro et al, 2011;Hervé et al, 2007;Pankhurst et al, 1999), Western and Eastern Peninsular Ranges (Lee et al, 2007), Sierra Nevada Batholith (Bateman et al, 1984;Cecil et al, 2011;Dodge et al, 1982) and Lachlan Fold Belt (Clemens et al, 2011); (e), black dotted arrow indicates the incremental trend in maficity and ∑HREE of a typical cordilleran-type granitoids similar to one of the Galiléia granitoids at which has been added from 1 to 5 vol.% of garnet. Except for one sample (FSV1), the ∑HREE content for the Galiléia granitoids is similar to the cordilleran-type granitoids; see text for further explanation.…”

Section: Whole Rock Geochemistrymentioning

confidence: 99%

Magmatic garnet in the Cordilleran-type Galiléia granitoids of the Araçuaí belt (Brazil): Evidence for crystallization in the lower crust

Narduzzi

Farina

Stevens

et al. 2017

Lithos

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Magmatic garnet, together with epidote, is a rare mineral association in cordilleran-I-type granitoids and of special petrogenetic significance. The metaluminous to slightly peraluminous (ASI = 0.97-1.07) Galiléia batholith (Brazil) is a large (ca. 30,000 km 2 ), Neoproterozoic (ca. 632-570 Ma) weakly foliated calc-alkaline granitoid body, characterized by the widespread occurrence of garnet (grossular 25-43 mol%) and epidote (pistacite 9.3-22.7 mol%). Field, petrographic and mineral chemical evidence indicates that garnet, epidote, biotite as well as white mica crystals (low-Si phengite), are magmatic. There is no difference in bulk rock major and trace element composition between the Galiléia granitoids and other garnet-free cordilleran-type granitoids worldwide. This evidence strongly suggests that the origin of the uncommon garnet + epidote parageneses is related to the conditions of magma crystallization, such as pressure, temperature and water content. Comparison between the mineral assemblages and mineral compositions from this study and those recorded in crystallization experiments on metaluminous calc-alkaline magmas, as well as within garnet-bearing metaluminous volcanic rocks and granitoids, indicates that the supersolidus coexistence of grossular-rich garnet, epidote and white mica is consistent with magma crystallization at pressures greater than 0.8 GPa (above 25 km depth) and at temperatures below 700°C, i.e. near the water saturated solidus. Furthermore, resorption textures around garnet (plagioclase ± quartz coronas) and epidote suggest that these minerals have been partially consumed prior to complete crystallization. These findings demonstrate that at 630 Ma the crust underneath the Araçuaí Orogen was already at least 25-30 km thick and relatively cool. However, this contrasts with the marked high heat flow registered from the neighbour Carlos Chagas Batholith located 50 km to the east. In fact such granitoids record granulite-facies metamorphism at the same pressure and time (ca. 570 Ma) of Galiléia granitoids crystallization. Thus, a more suitable geodynamic scenario is required in order to explain these two contrasting thermal regimes within the same orogen. Eventually, field, petrographic and mineral chemical analogies with similar garnet-bearing granitoids located in the fore-arc settings of the British Columbia subduction zone, possibly imply that the Galiléia granitoids represent "rare" garnet-and epidote-bearing metaluminous Cordilleran-Itype granites which can only form in a fore-arc setting.

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“…En este sentido, Pankhurst et al (1999) reconocieron hasta seis grupos de edades; el registro más antiguo reconocido correspondía al Jurásico Tardío, en el extremo sur del segmento norte (Hervé et al, 2007). Recientemente, Castro et al (2011) junto con el trabajo de González Díaz (1982), la presencia de cuerpos graníticos cenozoicos en la vertiente argentina de los Andes Norpatagónicos.…”

Section: Granitoides Del Batolito Patagónico (Jurásico Medio a Superior)unclassified

Deformación andina en el cordón del Hielo Azul al oeste de El Bolsón. Implicancias en la evolución tectónica de la Cordillera Norpatagónica en Río Negro, Argentina

Tobal

Vera

Folguera

et al. 2012

andgeo

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RESUMEN. Estudios geológicos de campo realizados en el cordón del Hielo Azul, al oeste de la localidad de El Bolsón, a los 42ºS en la Cordillera Norpatagónica (provincia de Río Negro, Argentina), permitieron establecer las distintas relaciones de contacto existentes entre las rocas volcanosedimentarias cordilleranas del Jurásico Inferior, las plutonitas del Batolito Patagónico Cordillerano del Jurásico Medio Superior y las volcanitas cenozoicas de la Formación Ventana. El análisis estructural de las unidades aflorantes mencionadas permitió identificar varias estructuras de deformación previamente desconocidas en este sector de los Andes. Se observó que las rocas volcánicas jurásicas que afloran en el cerro Lindo, al oeste de El Bolsón, se encuentran limitadas por un retrocorrimiento al este y un corrimiento fuera de secuencia al oeste; además se hallan afectadas por dos corrimientos, a los que se asocian estructuras plegadas de menor orden. Al norte, en el cerro Hielo Azul, se observó que las volcanitas jurásicas en su sector occidental se encuentran en contacto tectónico con las volcanitas de la Formación Ventana. Las observaciones de campo permiten inferir la existencia de una falla extensional que controló la depositación de las volcanitas cenozoicas, la cual habría sido luego invertida, sobreponiendo estas rocas a las volcanitas jurásicas. Las distintas fallas reconocidas ejercieron un control de primer orden en el proceso de estructuración del frente montañoso y son, por lo tanto, importantes para comprender el marco tectónico y el levantamiento de la Cordillera Norpatagónica. Se interpreta que la deformación tuvo lugar entre en el Eoceno y el Mioceno Tardío. Un pulso contraccional preoligoceno dio lugar al desarrollo de una faja plegada y corrida de piel fina que afectó a las volcanitas jurásicas. Durante el Oligoceno tuvo lugar un evento extensional de escala regional que dio lugar a la formación de depocentros como el que se reconoce en el cerro Silvia, donde aflora la Formación Ventana. Un segundo pulso contraccional desarrollado durante el Mioceno originó una faja plegada y corrida a través de fallas de basamento que levantaron el frente montañoso actual.

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Petrology and SHRIMP U–Pb zircon geochronology of Cordilleran granitoids of the Bariloche area, Argentina

Cited by 81 publications

References 52 publications

Age and composition of granulite xenoliths from Paso de Indios, Chubut province, Argentina

Age and composition of granulite xenoliths from Paso de Indios, Chubut province, Argentina

Magmatic garnet in the Cordilleran-type Galiléia granitoids of the Araçuaí belt (Brazil): Evidence for crystallization in the lower crust

Deformación andina en el cordón del Hielo Azul al oeste de El Bolsón. Implicancias en la evolución tectónica de la Cordillera Norpatagónica en Río Negro, Argentina

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