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Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/8881
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dc.contributor.authorallChang, L.; Paleomagnetic Laboratory “Fort Hoofddijk,” Department of Earth Sciences, Utrecht University, Utrecht, Netherlandsen
dc.contributor.authorallWinklhofer, M.; Department of Earth and Environmental Sciences, Ludwig-Maximilians University, Munich, Germanyen
dc.contributor.authorallRoberts, A. P.; Research School of Earth Sciences, The Australian National University, Canberra, Australiaen
dc.contributor.authorallHeslop, D.; Research School of Earth Sciences, The Australian National University, Canberra, Australiaen
dc.contributor.authorallFlorindo, F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italiaen
dc.contributor.authorallDekkers, M. J.; Paleomagnetic Laboratory “Fort Hoofddijk,” Department of Earth Sciences, Utrecht University, Utrecht, Netherlandsen
dc.contributor.authorallKrijgsman, W.; Paleomagnetic Laboratory “Fort Hoofddijk,” Department of Earth Sciences, Utrecht University, Utrecht, Netherlandsen
dc.contributor.authorallKodama, K.; Center for Advanced Marine Core Research, Kochi University, Nankoku, Kochi, Japanen
dc.contributor.authorallYamamoto, Y.; Center for Advanced Marine Core Research, Kochi University, Nankoku, Kochi, Japanen
dc.date.accessioned2014-01-28T13:52:46Zen
dc.date.available2014-01-28T13:52:46Zen
dc.date.issued2013-12en
dc.identifier.urihttp://hdl.handle.net/2122/8881en
dc.description.abstractPelagic marine carbonates provide important records of past environmental change. We carried out detailed low-temperature magnetic measurements on biogenic magnetite-bearing sediments from the Southern Ocean (Ocean Drilling Program (ODP) Holes 738B, 738C, 689D, and 690C) and on samples containing whole magnetotactic bacteria cells. We document a range of low-temperature magnetic properties, including reversible humped low-temperature cycling (LTC) curves. Different degrees of magnetite oxidation are considered to be responsible for the observed variable shapes of LTC curves. A dipole spring mechanism in magnetosome chains is introduced to explain reversible LTC curves. This dipole spring mechanism is proposed to result from the uniaxial anisotropy that originates from the chain arrangement of biogenic magnetite, similar to published results for uniaxial stable single domain (SD) particles. The dipole spring mechanism reversibly restores the remanence during warming in LTC measurements. This supports a previous idea that remanence of magnetosome chains is completely reversible during LTC experiments. We suggest that this magnetic fingerprint is a diagnostic indicator for intact magnetosome chains, although the presence of isolated uniaxial stable SD particles and magnetically interacting particles can complicate this test. Magnetic measurements through the Eocene section of ODP Hole 738B reveal an interval with distinct magnetic properties that we interpret to originate from less oxidized biogenic magnetite and enrichment of a biogenic “hard” component. Co-occurrence of these two magnetic fingerprints during the late Eocene in the Southern Ocean indicates less oxic conditions, probably due to increased oceanic primary productivity and organic carbon burial.en
dc.language.isoEnglishen
dc.publisher.nameAmerican Geophysical Unionen
dc.relation.ispartofJournal of geophysical research - solid earthen
dc.relation.ispartofseries12 / 118 (2013)en
dc.subjectpelagic carbonatesen
dc.subjectbiogenic magnetiteen
dc.subjectrock magnetismen
dc.subjectenvironmental magnetismen
dc.subjectODPen
dc.titleLow-temperature magnetic properties of pelagic carbonates: Oxidation of biogenic magnetite and identification of magnetosome chainsen
dc.typearticleen
dc.description.statusPublisheden
dc.type.QualityControlPeer-revieweden
dc.description.pagenumber6049–6065en
dc.subject.INGV04. Solid Earth::04.04. Geology::04.04.08. Sediments: dating, processes, transporten
dc.subject.INGV04. Solid Earth::04.05. Geomagnetism::04.05.09. Environmental magnetismen
dc.identifier.doi10.1002/2013JB010381en
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dc.description.obiettivoSpecifico2.2. Laboratorio di paleomagnetismoen
dc.description.journalTypeJCR Journalen
dc.description.fulltextrestricteden
dc.relation.issn0148-0227en
dc.contributor.authorChang, L.en
dc.contributor.authorWinklhofer, M.en
dc.contributor.authorRoberts, A. P.en
dc.contributor.authorHeslop, D.en
dc.contributor.authorFlorindo, F.en
dc.contributor.authorDekkers, M. J.en
dc.contributor.authorKrijgsman, W.en
dc.contributor.authorKodama, K.en
dc.contributor.authorYamamoto, Y.en
dc.contributor.departmentPaleomagnetic Laboratory “Fort Hoofddijk,” Department of Earth Sciences, Utrecht University, Utrecht, Netherlandsen
dc.contributor.departmentDepartment of Earth and Environmental Sciences, Ludwig-Maximilians University, Munich, Germanyen
dc.contributor.departmentResearch School of Earth Sciences, The Australian National University, Canberra, Australiaen
dc.contributor.departmentResearch School of Earth Sciences, The Australian National University, Canberra, Australiaen
dc.contributor.departmentIstituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italiaen
dc.contributor.departmentPaleomagnetic Laboratory “Fort Hoofddijk,” Department of Earth Sciences, Utrecht University, Utrecht, Netherlandsen
dc.contributor.departmentPaleomagnetic Laboratory “Fort Hoofddijk,” Department of Earth Sciences, Utrecht University, Utrecht, Netherlandsen
dc.contributor.departmentCenter for Advanced Marine Core Research, Kochi University, Nankoku, Kochi, Japanen
dc.contributor.departmentCenter for Advanced Marine Core Research, Kochi University, Nankoku, Kochi, Japanen
item.openairetypearticle-
item.cerifentitytypePublications-
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item.openairecristypehttp://purl.org/coar/resource_type/c_18cf-
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crisitem.author.deptNational Oceanography Centre, Southampton, University of Southampton, Southampton, UK-
crisitem.author.deptDepartment of Earth and Environmental Sciences, Ludwig-Maximilians University, Munich, Germany-
crisitem.author.deptNational Oceanography Centre, University of Southampton, European Way, Southampton SO14 3ZH, UK-
crisitem.author.deptResearch School of Earth Sciences, The Australian National University, Canberra, ACT 0200, Australia-
crisitem.author.deptIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione AC, Roma, Italia-
crisitem.author.deptPaleomagnetic Laboratory “Fort Hoofddijk,” Department of Earth Sciences, Utrecht University, Utrecht, Netherlands-
crisitem.author.deptCenter for Advanced Marine Core Research, Kochi University, Nankoku, Kochi, Japan-
crisitem.author.deptCenter for Advanced Marine Core Research, Kochi University, Nankoku, Kochi, Japan-
crisitem.author.orcid0000-0001-8245-0555-
crisitem.author.orcid0000-0002-6058-9748-
crisitem.author.orcid0000-0002-4156-3841-
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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