Dal Corso, J. and Marzoli, A. and Tateo, F. and Jenkyns, H.C. and Bertrand, H. and Youbi, N. and Mahmoudi, A. and Font, E. and Burati, N. and Cirilli, S. (2014) The dawn of CAMP volcanism and its bearing on the end-Triassic carbon cycle disruption. Journal of the Geological Society, 171 (2). pp. 153-164.

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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.

Item Type: Article
Uncontrolled Keywords: Carbon; Magnesia, Abrupt climate change; Cause-and-effect relationships; Central atlantic magmatic provinces; Geochemical fingerprints; Negative carbon isotope excursions; Sedimentary strata; Temporal correlations; Triassic-Jurassic boundary, Climate change, basalt; carbon cycle; climate variation; igneous geochemistry; magmatism; mass extinction; mineralogy; Triassic; volcanic eruption; volcanic gas; volcanism, Atlantic Ocean; Atlantic Ocean (Central); Morocco
Subjects: Earth and Planetary Sciences
Divisions: SCIENTIFIC PRODUCTION > Earth and Planetary Sciences
Depositing User: Administrateur Eprints Administrateur Eprints
Last Modified: 31 Jan 2020 15:46
URI: http://eprints.umi.ac.ma/id/eprint/2901

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