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

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<sub>2</...

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Autores principales: Spalletti, Luis Antonio, Limarino, Carlos Oscar
Formato: Articulo Revision
Lenguaje:Inglés
Publicado: 2017
Materias:
Ciencias Naturales
Choiyoi magmatism
Extinctions
Palaeoclimate
Permian
Southwestern gondwana
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/87607
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-87607
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Naturales
Choiyoi magmatism
Extinctions
Palaeoclimate
Permian
Southwestern gondwana
spellingShingle Ciencias Naturales
Choiyoi magmatism
Extinctions
Palaeoclimate
Permian
Southwestern gondwana
Spalletti, Luis Antonio
Limarino, Carlos Oscar
The Choiyoi magmatism in South Western Gondwana: implications for the end-permian mass extinction - a review
topic_facet Ciencias Naturales
Choiyoi magmatism
Extinctions
Palaeoclimate
Permian
Southwestern gondwana
description 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<sub>2</sub>) 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<sup>2</sup> with an average thickness of 700 m, so that the volume of effusive and consanguineous rocks is estimated at 1,260,000 km<sup>3</sup>. 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<sub>2</sub> and CH<sub>4</sub> 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<sub>2</sub> and CH<sub>4</sub> 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.
format Articulo
Revision
author Spalletti, Luis Antonio
Limarino, Carlos Oscar
author_facet Spalletti, Luis Antonio
Limarino, Carlos Oscar
author_sort Spalletti, Luis Antonio
title The Choiyoi magmatism in South Western Gondwana: implications for the end-permian mass extinction - a review
title_short The Choiyoi magmatism in South Western Gondwana: implications for the end-permian mass extinction - a review
title_full The Choiyoi magmatism in South Western Gondwana: implications for the end-permian mass extinction - a review
title_fullStr The Choiyoi magmatism in South Western Gondwana: implications for the end-permian mass extinction - a review
title_full_unstemmed The Choiyoi magmatism in South Western Gondwana: implications for the end-permian mass extinction - a review
title_sort choiyoi magmatism in south western gondwana: implications for the end-permian mass extinction - a review
publishDate 2017
url http://sedici.unlp.edu.ar/handle/10915/87607
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