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Atmospheric halogen and acid rains during the major Deccan episode: magnetic and mineral evidences

2013Other Open access
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dc.contributor.authorFont, Eric
dc.contributor.authorFabre, Sébastien
dc.contributor.authorNédélec, Anna
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.date.accessioned2013-10-17T14:03:43Z
dc.date.available2013-10-17T14:03:43Z
dc.date.issued2013
dc.date.updated2013-10-14T22:16:36Z
dc.description.abstractEnvironmental and climatic 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 palaeoenvironmental perturbations linked to paroxysmal Deccan phase-2. Results show a drastic decrease of detrital magnetite and presence of fine specular akaganeite, a hypothesized reaction product between FeCl2 from the 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 about 33,000 years, which is consistent with our magnetic data and the duration of the Deccan phase-2. This discovery represents an unprecedented piece of evidence of the nature and importance of the Deccan-related environmental changes.
dc.identifier.citationFont, Eric; Fabre, Sébastien; Nédélec, Anna; Adatte, Thierry; Keller, Gerta; Veiga-Pires, Cristina Carvalho; Ponte, Jorge; Mirão, José; Khozyem, Hassan; Spangenberg, Jorge. Atmospheric halogen and acid rains during the major Deccan episode: magnetic and mineral evidences, Trabalho apresentado em EGU 2013 Copernicus Meeting, In EGU 2013 Copernicus Meeting, Vienna, 2013.por
dc.identifier.otherAUT: CVP01371
dc.identifier.urihttp://hdl.handle.net/10400.1/3075
dc.language.isoengpor
dc.peerreviewedyes
dc.subjectAkaganeitepor
dc.subjectWeatheringpor
dc.subjectDeccanpor
dc.subjectAcid rainpor
dc.subjectRock magnetismpor
dc.subjectMass extinctionpor
dc.titleAtmospheric halogen and acid rains during the major Deccan episode: magnetic and mineral evidencespor
dc.typeother
dspace.entity.typePublication
oaire.citation.conferencePlaceViennapor
oaire.citation.titleEGU 2013 Copernicus Meetingpor
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.typeotherpor
relation.isAuthorOfPublicationd1541efa-0eaa-48dc-aea3-a1e64aa0065a
relation.isAuthorOfPublication.latestForDiscoveryd1541efa-0eaa-48dc-aea3-a1e64aa0065a

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