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

2014-08-21Book part Open access
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dc.contributor.authorFont, Eric
dc.contributor.authorFabre, Sébastien
dc.contributor.authorNedelec, A.
dc.contributor.authorAdatte, T.
dc.contributor.authorKeller, G.
dc.contributor.authorVeiga-Pires, C.
dc.contributor.authorPonte, J.
dc.contributor.authorMirão, José
dc.contributor.authorKhozyem, H.
dc.contributor.authorSpangenberg, J. E.
dc.contributor.editorGerta Keller, Andrew C. Kerr,
dc.date.accessioned2014-12-05T14:44:33Z
dc.date.available2014-12-05T14:44:33Z
dc.date.issued2014-08-21
dc.date.updated2014-11-25T23:37:22Z
dc.description.abstractEnvironmental 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.por
dc.identifier.citationFont, E.; Fabre, S.; Nedelec, A.; Adatte, T.; Keller, G.; VEIGA-PIRES, C; Ponte, J.; Mirao, J.; Khozyem, H.; Spangenberg, J. E.Atmospheric halogen and acid rains during the main phase of Deccan eruptions: Magnetic and mineral evidence, In Volcanism, Impacts, and Mass Extinctions:Causes and Effects, 353-368, USA: Geological Society of America Special Papers, 2014.por
dc.identifier.doihttp://dx.doi.org/10.1130/2014.2505(18)
dc.identifier.isbn978-0-8137-2505-5
dc.identifier.otherAUT: CVP01371
dc.identifier.urihttp://hdl.handle.net/10400.1/5675
dc.language.isoporpor
dc.peerreviewedyespor
dc.publisherGeological Society of Americapor
dc.relation.publisherversionhttp://specialpapers.gsapubs.org/content/505por
dc.subjectMass extinctionspor
dc.subjectVolcanism and climatepor
dc.subjectVolcanism - Effect of environment onpor
dc.titleAtmospheric halogen and acid rains during the main phase of Deccan eruptions: magnetic and mineral evidencepor
dc.typebook part
dspace.entity.typePublication
oaire.citation.conferencePlaceUSApor
oaire.citation.endPage368por
oaire.citation.startPage353por
oaire.citation.titleVolcanism, impacts, and mass extinctions: causes and effectspor
oaire.citation.volume505por
person.familyNameVeiga-Pires
person.givenNameCristina
person.identifier113325
person.identifier.ciencia-id4A1F-CEDA-E66C
person.identifier.orcid0000-0002-9323-0723
person.identifier.ridB-5144-2008
person.identifier.scopus-author-id7801372905
rcaap.rightsopenAccesspor
rcaap.typebookPartpor
relation.isAuthorOfPublicationd1541efa-0eaa-48dc-aea3-a1e64aa0065a
relation.isAuthorOfPublication.latestForDiscoveryd1541efa-0eaa-48dc-aea3-a1e64aa0065a

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