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The dawn of CAMP volcanism and its bearing on the end-Triassic carbon cycle disruption. (Articolo in rivista)

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The dawn of CAMP volcanism and its bearing on the end-Triassic carbon cycle disruption. (Articolo in rivista) (literal)

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Dal Corso J.[1], Marzoli A. [1,2] Tateo F. [2], Jenkyns H.C. [3], Bertrand H.[4], Youbi N. [5,6], Mahmoudi A.[7], Font E.[8], Burati N.[9], Cirili S. [9] (2014)
The dawn of CAMP volcanism and its bearing on the end-Triassic carbon cycle disruption.
in Journal of the Geological Society (Lond.); Blackwell Scientific, Londra (Regno Unito)
(literal)

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Dal Corso J.[1], Marzoli A. [1,2] Tateo F. [2], Jenkyns H.C. [3], Bertrand H.[4], Youbi N. [5,6], Mahmoudi A.[7], Font E.[8], Burati N.[9], Cirili S. [9] (literal)

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[1] Dipartimento di Geoscienze, Università degli Studi di Padova, Padova, Italy [2] Istituto di Geoscienze e Georisorse, CNR, Padova, Italy [3] Department of Earth Sciences, University of Oxford, Oxford OX1 3AN, United Kingdom [4] Laboratoire de Géologie de Lyon, UMR-CNRS5276, Université Lyon 1 and Ecole Normale Supérieure de Lyon, France [5] Department of Geology, Cadi Ayyad University, Marrakech, Morocco [6] Centro de Geologia da Universidade de Lisboa (CeGUL), Bloco C6, Lisboa, Portugal [7] Département de Géologie, Université Moulay-Ismaïl, Zitoune, Meknès, Morocco [8] IDL-UL, Campo Grande, 1749-016 Lisboa, Portugal [9] Dipartimento di Scienze della Terra, Università di Perugia, Perugia, Italy (literal)

Titolo

The dawn of CAMP volcanism and its bearing on the end-Triassic carbon cycle disruption. (literal)

Abstract

The cause-and-effect relationship between the c. 201 Ma eruption of the Central Atlantic magmatic province (CAMP) and the end-Triassic abrupt climate change and mass extinction is at present based on controversial temporal correlations. Upper Triassic sedimentary strata underlying CAMP basalts in Morocco illustrate a clear mineralogical and geochemical fingerprint of early CAMP basaltic eruptions, namely unusually high contents of MgO (10-32 wt%) and of mafic clay minerals (11-84%). In the same rocks a coincident negative carbon-isotope excursion (CIE) is present, equivalent to the so-called 'initial negative CIE' recorded worldwide shortly before the Triassic-Jurassic boundary. The new data show that the onset of CAMP activity preceded the end-Triassic carbon cycle disruption and that the initial negative CIE is unequivocally synchronous with CAMP volcanism. The results of this study strongly support the hypothesis that the culmination of pollution of atmosphere and seawater by CAMP-derived volcanic gases was the proximate cause of the end-Triassic mass extinction. © 2014 The Geological Society of London. (literal)

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