Three stages in the Late Paleozoic to Triassic magmatism of southwestern Gondwana, and the relationships with the volcanogenic events in coeval basins

Sato, Ana María; Llambías, Eduardo Jorge; Basei, Miguel Ângelo Stipp; Castro, Carlos E.

doi:10.1016/j.jsames.2015.07.005

Cited by 154 publications

(98 citation statements)

References 109 publications

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“…This magmatism, known as the Choiyoi Magmatic Province, is characterised by a widespread and thick record of volcanic and volcaniclastic rocks and was developed after a phase of orogenic deformation (Mpodozis and Kay, 1992;Busquets et al, 2013) occurred in the early Permian, between 290 and 280 Ma (Llambías andSato, 1990, 1995;Pérez and Ramos, 1990). The Choiyoi cycle consists of two magmatic episodes and shows an evolutionary trend from calc-alkaline to anorogenic compositions (Sato et al, 2015). The older (early Permian) episode is more restricted and mostly represented by intermediate rocks.…”

Section: The Choiyoi Magmatic Province In Western Gondwanamentioning

confidence: 99%

“…The Choiyoi Magmatism took place between the Cisuralian (∼286 Ma) and the early Triassic (∼247 Ma) (Sato et al, 2015). It has quite large regional development and includes all the geological provinces located in the southwestern sector of Gondwana, such as part of the Chilean Coastal Cordillera, the Chilean Precordillera, the Principal and the Frontal Andean Cordillera, the Argentinian Precordillera, the San Rafael-Las Matras-Chadileuvú Blocks and northern Patagonia ( Fig.…”

Section: The Choiyoi Magmatic Province In Western Gondwanamentioning

confidence: 99%

“…The magmatic rocks of this vast region are not limited to the Choiyoi magmatic Province, but involve older rocks generated between the late Mississippian and Artinskian (Pre-Choiyoi Magmatism, Sato et al, 2015), as well as younger middle to late Triassic units (Post-Choiyoi Magmatism, Sato et al, 2015). In addition, Limarino et al (2014) have highlighted the existence of Permian volcanics in northern Chile, Bolivia and Perú that far exceed the limits of the Choiyoi Province.…”

Section: The Choiyoi Magmatic Province In Western Gondwanamentioning

confidence: 99%

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The Choiyoi magmatism in south western Gondwana: implications for the end-permian mass extinction - a review

Spalletti

Limarino

2017

andgeo

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ABSTRACT. The end of the Permian period is marked by global warming and the biggest known mass extinction on Earth. The crisis is commonly attributed to the formation of large igneous provinces because continental volcanic emissions have the potential to control atmospheric carbon dioxide (CO 2 ) levels and climate change. We propose that in southwestern Gondwana the long-term hothouse Permian environmental conditions were associated with the development of the Choiyoi magmatism. This large igneous province was developed between the Cisuralian and the early Triassic. It covers an area estimated at 1,680,000 km 2 with an average thickness of 700 m, so that the volume of effusive and consanguineous rocks is estimated at 1,260,000 km 3 . Towards the western sector of the study region, a major overlap exists between the regional development of the Choiyoi magmatism and the Carboniferous sedimentary basins, which include paralic and continental deposits with intercalations of peat and coal beds. Commonly, these upper Palaeozoic deposits accumulated on a thick substrate composed of Cambro-Ordovician carbonates and Ordovician to Devonian terrigenous sedimentary rocks characterised by a large proportion of dark organic-rich shales and turbidite successions. While extensive volcanism released large masses of carbon dioxide into the Permian atmosphere, the heating of Palaeozoic organic-rich shales, peat and carbonates by ascending magma led to CO 2 and CH 4 gas generation in sufficient volumes to amplify the major climatic change. The analysis of the almost continuous record of Permian redbeds in the Paganzo basin, where the Choiyoi magmatism is not recorded, allowed us to recognize two main pulses of strong environmental desiccation, one at the Cisuralian and the second around the end-Permian. These two drastic climatic crisis are attributed to peaks of CO 2 and CH 4 outbursts to the atmosphere and related collateral effects, such as acid rain, impoverishment of soils and increase in forest-fire frequency. We propose that the combination of these multiple mechanisms triggered the decline of biodiversity in southwestern Gondwana and caused the end-Permian extinction of most of the Glossopteridales. RESUMEN. El magmatismo Choiyoi en el sudoeste de Gondwana: su implicancia en la extinción en masa del Pérmico tardío -una revisión. El final del Pérmico está caracterizado por un proceso de calentamiento global que llevó a la mayor extinción en masa registrada en la Tierra. Esta crisis se atribuye comúnmente a la generación de grandes provincias ígneas en ámbito continental, cuyas emisiones volcánicas han controlado los niveles de CO 2 en la atmósfera y el consecuente cambio climático. En este trabajo se propone que las condiciones fuertemente cálidas (hothouse) del Pérmico en el sudoeste de Gondwana estuvieron asociadas con el desarrollo del magmatismo Choiyoi. Esta provincia ígnea, que se desarrolló durante el lapso Cisuraliano-Triásico temprano, cubrió un área estimada en 1.680.000 km 2 con un espesor medio de 700 m, de modo...

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Section: The Choiyoi Magmatic Province In Western Gondwanamentioning

confidence: 99%

Section: The Choiyoi Magmatic Province In Western Gondwanamentioning

confidence: 99%

Section: The Choiyoi Magmatic Province In Western Gondwanamentioning

confidence: 99%

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The Choiyoi magmatism in south western Gondwana: implications for the end-permian mass extinction - a review

Spalletti

Limarino

2017

andgeo

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“…1; Enkelmann et al, 2014), whereas coeval fault activity was recognized for the Sierras de Córdoba (Whitmeyer, 2008) and the Sierra de Comechingones (Löbens et al, 2011) based on Ar/Ar pseudotachyllite and K-Ar fault gouge data, respectively. Permian exhumation and deformation, in turn, is also recorded in other areas of the Sierras Pampeanas (Coughlin et al, 1998;Bense et al, 2013Bense et al, , 2014Sato et al, 2015).…”

Section: Implications For the Evolution Of The Sierra De San Luismentioning

confidence: 87%

“…12b). Triassic exhumation and deformation is recorded by K-Ar fault gouge and thermochronological data, resulting from rifting in the Andean foreland during extension (Kay et al, 1991;Giambiagi et al, 2011;Sato et al, 2015). Coeval volcaniclastic rocks are recorded in the Sierra de Varela area, ca.…”

Section: Implications For the Evolution Of The Sierra De San Luismentioning

confidence: 99%

Exhumation history and landscape evolution of the Sierra de San Luis (Sierras Pampeanas, Argentina) - new insights from low - temperature thermochronological data

Bense

Costa

Oriolo

et al. 2017

andgeo

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ABSTRACT. This paper presents low-temperature thermochronological data and K-Ar fault gouge ages from the Sierra de San Luis in the Eastern Sierras Pampeanas in order to constrain its low-temperature thermal evolution and exhumation history. Thermal modelling based on (U-Th)/He dating of apatite and zircon and apatite fission track dating point to the Middle Permian and the Triassic/Early Jurassic as main cooling/exhumation phases, equivalent to ca. 40-50% of the total exhumation recorded by the applied methods. Cooling rates are generally low to moderate, varying between 2-10 °C/Ma during the Permian and Triassic periods and 0.5-1.5 °C/Ma in post-Triassic times. Slow cooling and, thus, persistent residence of samples in partial retention/partial annealing temperature conditions strongly influenced obtained ages. Thermochronological data indicate no significant exhumation after Cretaceous times, suggesting that sampled rocks were already at or near surface by the Cretaceous or even before. As consequence, Cenozoic cooling rates are low, generally between 0.2-0.5 °C/Ma which is, depending on geothermal gradient used for calculation, equivalent to a total Cenozoic exhumation of 0.6-1.8 km. K-Ar fault gouge data reveal long-term brittle fault activity. Fault gouge ages constrain the end of ductile and onset of brittle deformation in the Sierra de San Luis to the Late Carboniferous/Early Permian. Youngest K-Ar illite ages of 222-172 Ma are interpreted to represent the last illite formation event, although fault activity is recorded up to the Holocene. RESUMEN. Historia de la exhumación y evolución del paisaje de la sierra de San Luis (Sierras Pampeanas, Argentina)-nuevas perspectivas a partir de datos termocronológicos de baja temperatura. Esta contribución presenta datos de termocronología de baja temperatura y edades de illitas generadas en zonas de fallas de la sierra de San Luis, en las Sierras Pampeanas Orientales de Argentina, con el propósito de aportar al conocimiento de la historia de su exhumación y evolución termal de baja temperatura. El modelado termal basado en dataciones de (U-Th)/He, apatita, circón y trazas de fisión sugiere que las principales fases de exhumación y enfriamiento ocurrieron durante el Pérmico medio y Triásico/Jurásico inferior, contribuyendo con aproximadamente 40-50% de la exhumación total registrada por los métodos utilizados. Las tasas de enfriamiento son, en general, bajas a moderadas, variando entre 2-10 °C/Ma durante el Pérmico y Triásico y 0,5-1,5 °C/Ma después del este último período. El lento enfriamiento y la persistente residencia de las muestras analizadas en condiciones térmicas de retención parcial (partial annealing) ha influenciado notoriamente las edades obtenidas. Los datos termocronológicos indican que no ha habido una exhumación 276 Exhumation history and LandscapE EvoLution of thE siErra dE san Luis (siErras pampEanas, argEntina)... significativa después del Cretácico o incluso antes. Consecuentemente, las tasas de enfriamiento durante el Cenozoico, son bajas, ge...

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Middle Jurassic-Late Cretaceous Paleogeography of the Western Margin of the Neuquén Basin (34° 30′–36° S)

Tapia

Muñoz

Farías

et al. 2020

Springer Earth System Sciences

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Three stages in the Late Paleozoic to Triassic magmatism of southwestern Gondwana, and the relationships with the volcanogenic events in coeval basins

Cited by 154 publications

References 109 publications

The Choiyoi magmatism in south western Gondwana: implications for the end-permian mass extinction - a review

The Choiyoi magmatism in south western Gondwana: implications for the end-permian mass extinction - a review

Exhumation history and landscape evolution of the Sierra de San Luis (Sierras Pampeanas, Argentina) - new insights from low - temperature thermochronological data

Middle Jurassic-Late Cretaceous Paleogeography of the Western Margin of the Neuquén Basin (34° 30′–36° S)

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