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Book Chapter

Atmospheric halogen and acid rains during the main phase of Deccan eruptions: Magnetic and mineral evidence

By
Eric Font
Eric Font
Instituto Dom Luís, Faculdade de Ciências, Universidade de Lisboa (IDL-FCUL), Edifício C8-8.3.22, Campo Grande, 1749-016, Portugal
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Sébastien Fabre
Sébastien Fabre
Institut de Recherche en Astrophysique et Planétologie (IRAP), Observatoire Midi-Pyrénées (OMP), Université de Toulouse, 31028 Toulouse 24 Cedex 4, France
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Anne Nédélec
Anne Nédélec
Géosciences Environnement Toulouse (GET), UMR 5563, Université de Toulouse, 31400 Toulouse, France
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Thierry Adatte
Thierry Adatte
Earth Sciences Institute (ISTE), Université de Lausanne, Geopolis, CH-1015 Lausanne, Switzerland
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Gerta Keller
Gerta Keller
Geosciences Department, Princeton University, Princeton, New Jersey 08544, USA
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Cristina Veiga-Pires
Cristina Veiga-Pires
Centro de Investigação Marinha e Ambiental (CIMA), Faculdade de Ciencias e Tecnologia, Universidade do Algarve, Campus de Gambelas, 8005-139 Faro, Portugal
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Jorge Ponte
Jorge Ponte
Instituto Dom Luís, Universidade de Lisboa (IDL-UL), Edifício C8-8.3.22, Campo Grande, 1749-016, Portugal
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José Mirão
José Mirão
HERCULES Laboratory (HERança CULtural Estudos e Salvaguarda/Cultural Heritage Studies and Safeguard), University of Evora, 7000-809 Evora, Portugal
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Hassan Khozyem
Hassan Khozyem
Earth Sciences Institute (ISTE), Université de Lausanne, Geopolis, CH-1015 Lausanne, Switzerland and Geology Department, Faculty of Sciences, Aswan University, 81528-Aswan, Egypt
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Jorge E. Spangenberg
Jorge E. Spangenberg
Institute of Earth Surface Dynamics (IDYST), University of Lausanne, Building Géopolis, CH-1015 Lausanne, Switzerland
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Published:
September 01, 2014

Environmental changes linked to Deccan volcanism are still poorly known. A major limitation resides in the paucity of direct Deccan volcanism markers and in the geologically short interval where both impact and volcanism occurred, making it hard to evaluate their contributions to the mass extinction. We investigated the low-magnetic-susceptibility interval just below the iridium-rich layer of the Bidart (France) section, which was recently hypothesized to be the result of paleoenvironmental perturbations linked to paroxysmal Deccan phase 2. Results show a drastic decrease of detrital magnetite and presence of scarce akaganeite, a hypothesized reaction product formed in the aerosols derived from reaction of a volcanic plume with water and oxygen in the high atmosphere. A weathering model of the consequences of acidic rains on a continental regolith reveals nearly complete magnetite dissolution after ~31,000 yr, which is consistent with our magnetic data and falls within the duration of the Deccan phase 2. These results highlight the nature and importance of the Deccan-related environmental changes leading up to the end- Cretaceous mass extinction.

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Contents

GSA Special Papers

Volcanism, Impacts, and Mass Extinctions: Causes and Effects

Gerta Keller
Gerta Keller
Department of Geosciences, Princeton University, Princeton, New Jersey 08544, USA
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Andrew C. Kerr
Andrew C. Kerr
School of Earth and Ocean Sciences, Cardiff University, Park Place, Cardiff CF10 3AT, Wales, UK
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Geological Society of America
Volume
505
ISBN print:
9780813725055
Publication date:
September 01, 2014

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