An extensive K-bentonite as an indicator of a super-eruption in northern Iberia 477 My ago

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An extensive K-bentonite as an indicator of a super-eruption in northern Iberia 477 My ago	1 MB	Adobe Acrobat PDF	Read	Download
DOI Доступ к ресурсу на сайте издателя			10.1088/1755-1315/319/1/012007

Title: An extensive K-bentonite as an indicator of a super-eruption in northern Iberia 477 My ago
Creator: Gutiérrez-Marco, J. C.
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Fernández-Suárez, Javier
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Bernárdez, E.
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Corfu, F.
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López-Carmona, Alicia
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Gutiérrez-Alonso, Gabriel
Date: 2019
DOI: 10.1088/1755-1315/319/1/012007
Description: Zircon and monazite ID-TIMS U-Pb dating of four Lower Ordovician altered ash-fall tuff beds (K-Bentonites) in NW Iberia provided coetaneous ages of 477.5±1, 477±1.3 Ma, 477.2±1.1 Ma and 477.3±1 Ma, with a pooled concordia age of 477.2±0.74 Ma. A conservative estimation of the volume and mass of the studied K-bentonite beds (using data from the Cantabrian Zone) returns a minimum volume for the preserved deposits of ca. 37.5 km3 (Volcanic Explosivity Index - VEI = 6, Colossal). When considering other putative equivalent beds in other parts of Iberia and neighbouring realms the volume of ejecta associated to this event would make it reach the Supervolcanic-Apocalyptic status (VEI=8, >1000 km3). Contrary to most cases of this kind of gargantuan eruption events, the studied magmatic event took place in relation to continental margin extension and thinning and not to plate convergence. We speculate that a geochronologically coincident large caldera event observed in the geological record of NW Iberia could be ground zero of this super-eruption.

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collection(s): Геолого-географический факультет
Identifier: смотреть в электронном каталоге НБ ТГУ
Type: статьи в журналах
Source: IOP Conference Series: Earth and Environmental Science. 2019. Vol. 319. P. 012007 (1-8)
Language: eng

Created: 18-08-2020

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Геолого-географический факультет An extensive K-bentonite as an indicator of a super-eruption in northern Iberia 477 My ago