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Synchrony of the Central Atlantic magmatic province and the Triassic-Jurassic boundary climatic and biotic crisis

¹ Dipartimento di Mineralogia e Petrologia, Università di Padova, c. Garibaldi 37, 35137 Padova, Italy
² Laboratoire des Sciences de la Terre, UMR-CNRS 5570, Ecole Normale Supérieure de Lyon, and UCBL, 46, Allée d'Italie, 69364 Lyon, France
³ Department of Earth and Planetary Science, University of California, Berkeley, California 94720, USA
⁴ Dipartimento di Scienze della Terra, Università di Perugia, Piazza Università 1, 06100 Perugia, Italy
⁵ Université de Nice Sophia-Antipolis, UMR Géosciences Azur, Parc Valrose, 06108 Nice, France
⁶ Berkeley Geochronology Center, 2455 Ridge Road, Berkeley, California 94709, USA, and Department of Earth and Planetary Science, University of California, Berkeley, California 94720, USA
⁷ Department of Geology, Cadi Ayyad University, Boulevard Prince Moulay Abdellah, Marrakech, Morocco
⁸ Section des Sciences de la Terre, Université de Genève, 13 rue des Maraîchers, 1205 Genève, Switzerland
⁹ Dipartimento di Mineralogia e Petrologia, Università di Padova, c. Garibaldi 37, 35137 Padova, Italy

The evolution of life on Earth is marked by catastrophic extinction events, one of which occurred ca. 200 Ma at the transition from the Triassic Period to the Jurassic Period (Tr-J boundary), apparently contemporaneous with the eruption of the world's largest known continental igneous province, the Central Atlantic magmatic province. The temporal relationship of the Tr-J boundary and the province's volcanism is clarified by new multidisciplinary (stratigraphic, palynologic, geochronologic, paleomagnetic, geochemical) data that demonstrate that development of the Central Atlantic magmatic province straddled the Tr-J boundary and thus may have had a causal relationship with the climatic crisis and biotic turnover demarcating the boundary.

Key Words: Central Atlantic magmatic province • flood basalts • mass extinction • Triassic-Jurassic boundary • Morocco

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