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dc.contributor.authorallVenuti, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia-
dc.contributor.authorallFlorindo, F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia-
dc.contributor.authorallCaburlotto, A.; Istituto Nazionale di Oceanografia e di Geofisica Sperimentale, Sgonico, Italy-
dc.contributor.authorallHounslow, M. W.; Lancaster Environment Centre, Lancaster University, Lancaster, UK-
dc.contributor.authorallHillenbrand, C.-D.; British Antarctic Survey, Cambridge, UK-
dc.contributor.authorallStrada, E.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia-
dc.contributor.authorallTalarico, F. M.; Dipartimento di Scienze della Terra, Università di Siena, Siena, Italy-
dc.contributor.authorallCavallo, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia-
dc.description.abstractWe present results of detailed paleomagnetic investigations on deep!sea cores from sediment drifts located along the Pacific continental margin of the Antarctic Peninsula. High!resolution magnetic measurements on u channel samples provide detailed age models for three cores collected from drift 7, which document an age of 122 ka for the oldest sediments recovered near the drift crest at site SED!07 and a high sedimentation rate (11 cm/kyr) at site SED!12 located close to the Alexander Channel system. Low! and high!temperature magnetic measurements in conjunction with microscopic and mineralogic observations from drifts 4, 5 and 7 indicate that pseudosingle!domain detrital titanomagnetite (partially oxidized and with limited Ti substitution) is the dominant magnetic mineral in the drift sediments. The titanomagnetite occurs in two magnetic forms: (1) a low!coercivity form similar to laboratory!synthesized titanomagnetite and (2) a high!coercivity form (Bcr > 60 mT). These two forms vary in amount and stratigraphic distribution across the drifts. We did not find evidence for diagenetic magnetic iron sulfides as has been previously suggested for these drift deposits. The observed change of magnetic mineralogy in sediments deposited during Heinrich events on drift 7 appears to be related to warming periods, which temporarily modified the normal glacial transport pathways of glaciogenic detritus to and along the continental rise and thus resulted in deposition of sediments with a different provenance. Understanding this sediment provenance delivery signature at a wider spatial scale should provide information about ice sheet dynamics in West Antarctica over the last !100 kyr.en_US
dc.publisher.nameAmerican Geophysical Unionen_US
dc.relation.ispartofJournal of Geophysical Researchen_US
dc.relation.ispartofseries/116 (2011)en_US
dc.subjectAntarctic Peninsulaen_US
dc.subjectPacific marginen_US
dc.subjectsediment driften_US
dc.subjectlate Pleistoceneen_US
dc.subjectMineral magnetismen_US
dc.subjectrelative palaeointensityen_US
dc.titleLate Quaternary sediments from deep!sea sediment drifts on the Antarctic Peninsula Pacific margin: Climatic control on provenance of mineralsen_US
dc.subject.INGV04. Solid Earth::04.05. Geomagnetism::04.05.06. Paleomagnetismen_US
dc.subject.INGV04. Solid Earth::04.05. Geomagnetism::04.05.09. Environmental magnetismen_US
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dc.description.obiettivoSpecifico2.2. Laboratorio di paleomagnetismoen_US
dc.description.journalTypeJCR Journalen_US
dc.contributor.authorVenuti, A.-
dc.contributor.authorFlorindo, F.-
dc.contributor.authorCaburlotto, A.-
dc.contributor.authorHounslow, M. W.-
dc.contributor.authorHillenbrand, C.-D.-
dc.contributor.authorStrada, E.-
dc.contributor.authorTalarico, F. M.-
dc.contributor.authorCavallo, A.-
dc.contributor.departmentIstituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia-
dc.contributor.departmentIstituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia-
dc.contributor.departmentIstituto Nazionale di Oceanografia e di Geofisica Sperimentale, Sgonico, Italy-
dc.contributor.departmentLancaster Environment Centre, Lancaster University, Lancaster, UK-
dc.contributor.departmentBritish Antarctic Survey, Cambridge, UK-
dc.contributor.departmentIstituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia-
dc.contributor.departmentDipartimento di Scienze della Terra, Università di Siena, Siena, Italy-
dc.contributor.departmentIstituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia-
item.fulltextWith Fulltext-
crisitem.classification.parent04. Solid Earth- Antarctic Survey, Cambridge, UK- Nazionale di Geofisica e Vulcanologia (INGV), Sezione Roma1, Roma, Italia- - Borgo Grotta Gigante 42/c, Sgonico (TS)- di Scienze della Terra, Università di Siena, Siena, Italy- Nazionale di Geofisica e Vulcanologia (INGV), Sezione Roma2, Roma, Italia- Nazionale di Geofisica e Vulcanologia (INGV), Sezione AC, Roma, Italia- Environment Centre, Lancaster University, Lancaster, UK- Nazionale di Geofisica e Vulcanologia (INGV), Sezione Roma2, Roma, Italia- Nazionale di Geofisica e Vulcanologia- Nazionale di Geofisica e Vulcanologia- Nazionale di Geofisica e Vulcanologia- Nazionale di Geofisica e Vulcanologia-
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