Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/6408
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dc.contributor.authorallRoberts, A. P.; National Oceanography Centre, University of Southampton, European Way, Southampton SO14 3ZH, UKen
dc.contributor.authorallFlorindo, F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italiaen
dc.contributor.authorallLarrasoaña, J. C.; National Oceanography Centre, University of Southampton, European Way, Southampton SO14 3ZH, UK and Area de Cambio Global, Instituto Geológico y Minero de España, Oficinade Proyectos de Zaragoza, C/Manuel Lasala 44, 9B, Zaragoza 50006, Spainen
dc.contributor.authorallO'Regan, M. A.; National Oceanography Centre, University of Southampton, European Way, Southampton SO14 3ZH, UK and Department of Geology and Geochemistry, Stockholm University, SE-10691 Stockholm, Swedenen
dc.contributor.authorallZhao, X.; National Oceanography Centre, University of Southampton, European Way, Southampton SO14 3ZH, UKen
dc.date.accessioned2010-12-16T11:56:38Zen
dc.date.available2010-12-16T11:56:38Zen
dc.date.issued2010en
dc.identifier.urihttp://hdl.handle.net/2122/6408en
dc.description.abstractThe Vrica section in Calabria, southern Italy, was the global stratotype for the Pliocene–Pleistocene boundary until this boundary was redefined in 2009. Several paleomagnetic investigations have been carried out at Vrica to determine the age of the formerly defined Pliocene–Pleistocene boundary, which was a key calibration point for the astronomical polarity timescale(APTS). Each study has documented a complex polarity pattern at and above the top of the Olduvai subchron and in relation to the existence of the so-called Vrica subchron. When constructing the APTS, two alternative interpretations for the Vrica section were proposed,neither of which could be conclusively supported. Authigenic growth of magnetic iron sulphide minerals was proposed to explain the complex magnetic polarity record. Availability of a fresh 50-m sediment core enabled us to test this possibility. Our magnetostratigraphic record is similar to that of previous studies, but it is also complex above the Olduvai subchron. We confirm abundant occurrences of authigenic greigite and pyrrhotite, along with detrital titanomagnetite. Authigenic monoclinic pyrrhotite indicates growth significantly later than deposition, and greigite can grow at any time during diagenesis, depending on the availability of dissolved iron and sulphide. The spatially variable magnetic polarity pattern at Vrica is therefore interpreted to have resulted from post-depositional magnetic iron sulphide formation at variable times. Tectonism along the Calabrian arc provides a plausible mechanism for forcing reducing fluids through the sediments, thereby supplying the dissolved ions needed to produce late diagenetic sulphide growth and remagnetization. The complex magnetostratigraphic record at Vrica was taken into account when the APTS was developed, and alternative interpretations result in a maximum age difference of 50 kyr for the upper Olduvai reversal. Our results therefore do not undermine the APTS. Rather, they explain the complex magnetic polarity pattern at this globally important location and highlight the importance of remagnetization processes in such sediments.en
dc.language.isoEnglishen
dc.publisher.nameElsevier B.V.en
dc.relation.ispartofEarth and Planetary Science Lettersen
dc.relation.ispartofseries/ 292 (2010)en
dc.subjectPlioceneen
dc.subjectPleistoceneen
dc.subjectVricaen
dc.subjectmagnetostratigraphyen
dc.subjectOlduvaien
dc.subjectremagnetizationen
dc.subjectgreigiteen
dc.subjectpyrrhotiteen
dc.subjectmethanehydrateen
dc.titleComplex polarity pattern at the former Plio–Pleistocene global stratotype section at Vrica (Italy): Remagnetization by magnetic iron sulphidesen
dc.typearticleen
dc.description.statusPublisheden
dc.type.QualityControlPeer-revieweden
dc.description.pagenumber98-111en
dc.subject.INGV04. Solid Earth::04.05. Geomagnetism::04.05.06. Paleomagnetismen
dc.subject.INGV04. Solid Earth::04.05. Geomagnetism::04.05.07. Rock magnetismen
dc.identifier.doi10.1016/j.epsl.2010.01.025en
dc.description.obiettivoSpecifico2.2. Laboratorio di paleomagnetismoen
dc.description.journalTypeJCR Journalen
dc.description.fulltextrestricteden
dc.contributor.authorRoberts, A. P.en
dc.contributor.authorFlorindo, F.en
dc.contributor.authorLarrasoaña, J. C.en
dc.contributor.authorO'Regan, M. A.en
dc.contributor.authorZhao, X.en
dc.contributor.departmentNational Oceanography Centre, University of Southampton, European Way, Southampton SO14 3ZH, UKen
dc.contributor.departmentIstituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italiaen
dc.contributor.departmentNational Oceanography Centre, University of Southampton, European Way, Southampton SO14 3ZH, UK and Area de Cambio Global, Instituto Geológico y Minero de España, Oficinade Proyectos de Zaragoza, C/Manuel Lasala 44, 9B, Zaragoza 50006, Spainen
dc.contributor.departmentNational Oceanography Centre, University of Southampton, European Way, Southampton SO14 3ZH, UK and Department of Geology and Geochemistry, Stockholm University, SE-10691 Stockholm, Swedenen
dc.contributor.departmentNational Oceanography Centre, University of Southampton, European Way, Southampton SO14 3ZH, UKen
item.openairetypearticle-
item.cerifentitytypePublications-
item.languageiso639-1en-
item.grantfulltextrestricted-
item.openairecristypehttp://purl.org/coar/resource_type/c_18cf-
item.fulltextWith Fulltext-
crisitem.author.deptNational Oceanography Centre, University of Southampton, European Way, Southampton SO14 3ZH, UK-
crisitem.author.deptIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione AC, Roma, Italia-
crisitem.author.deptInstituto Geológico y Minero de España, Unidad de Zaragoza, E-50006, Zaragoza, Spain-
crisitem.author.deptNational Oceanography Centre, University of Southampton, European Way, Southampton SO14 3ZH, UK and Department of Geology and Geochemistry, Stockholm University, SE-10691 Stockholm, Sweden-
crisitem.author.deptNational Oceanography Centre, University of Southampton, European Way, Southampton SO14 3ZH, UK-
crisitem.author.orcid0000-0002-6058-9748-
crisitem.author.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
crisitem.classification.parent04. Solid Earth-
crisitem.classification.parent04. Solid Earth-
crisitem.department.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
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