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Denmark Strait during the Late Glacial Maximum and marine isotope stage 3: sediment sources and transport processes

2017-08Journal article Restricted access
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dc.contributor.authorAndrews, J. T.
dc.contributor.authorDunhill, G.
dc.contributor.authorVogt, C.
dc.contributor.authorVoelker, Antje
dc.date.accessioned2019-11-20T15:07:26Z
dc.date.available2019-11-20T15:07:26Z
dc.date.issued2017-08
dc.description.abstractThe sediment records from north and south of Denmark Strait (cores PS2644 and MD99-2323) and on the Kangerlussuaq Trough Mouth Fan (KTMF) (MD99-2260) are evaluated for the period 12 to 60 cal ka BP with the goal of evaluating: 1) the relative roles of the Greenland and Iceland Ice Sheets in sediment composition, 2) the processes of sediment supply, and 3) the relationship, if any, between the atmospheric derived ice core records and glacial marine sediment history. These questions were addressed using counts of coarse (> 2 mm) ice rafted debris (IRD), magnetic susceptibility, grain-size spectra, and sediment mineral composition. A significant difference in these variables occurred between MS3 and IVII52, with the latter showing small to modest abrupt changes in felsic and mafic minerals and in IRD, compared to larger and less variable changes during MIS2. The dominant bedrock source archived in the cores is the Cenozoic basaltic outcrops from East Greenland and Iceland (-60%) but there are frequent pulses of felsic-rich sediments (similar to 17-36%), which coincided with Greenland stadials. There is also a persistent detrital carbonate input. The largest shift in most sediment proxies occurred 28-30 cal ka BP reflecting the sustained expansion of the ice sheets. The grain-size spectra on the Snorri Drift (MD99-2323) reflected complex depositional histories involving the supply of poorly sorted glacially derived sediment (sand, silt, and clay) and reworking by bottom currents.
dc.description.sponsorshipNational Science Foundation (NSF) [OCE-98-09001, OPP-0082347]
dc.description.sponsorshipGeological Society of America Graduate Student grants
dc.description.sponsorshipGerman Science Foundation (Deutsche Forschungsgemeinschaft/DFG) [SFB313]
dc.description.sponsorshipGerman Science Foundation (Deutsche Forschungsgemeinschaft/DFG) [Fi442/10-1, Fi442/10-2]
dc.description.sponsorshipCCMAR [UID/Multi/04326/2013]
dc.identifier.doi10.1016/j.margeo.2017.07.003
dc.identifier.issn0025-3227
dc.identifier.urihttp://hdl.handle.net/10400.1/13038
dc.language.isoeng
dc.peerreviewedyes
dc.publisherElsevier
dc.subjectIce-rafted debris
dc.subjectEast Greenland current
dc.subjectNorth Atlantic Ocean
dc.subjectSea Heinrich layers
dc.subjectLate Quaternary
dc.subjectYounger Dryas
dc.subjectLabrador Sea
dc.subjectSoutheast Greenland
dc.subjectSize distributions
dc.subjectNordic Seas
dc.subjectGreenland Ice Sheet
dc.subjectDenmark Strait
dc.subjectMarine isotopes stages 2 and 3
dc.subjectQuantitative XRD mineral assemblages
dc.subjectGrain-size spectra
dc.subjectIceland Ice Sheet
dc.titleDenmark Strait during the Late Glacial Maximum and marine isotope stage 3: sediment sources and transport processes
dc.typejournal article
dspace.entity.typePublication
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/5876/UID%2FMulti%2F04326%2F2013/PT
oaire.citation.endPage198
oaire.citation.startPage181
oaire.citation.titleMarine Geology
oaire.citation.volume390
oaire.fundingStream5876
person.familyNameVoelker
person.givenNameAntje
person.identifier2315310
person.identifier.ciencia-idC11E-D8E6-CDFA
person.identifier.orcid0000-0001-6465-6023
person.identifier.ridC-5427-2012
person.identifier.scopus-author-id8784446000
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsrestrictedAccess
rcaap.typearticle
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relation.isAuthorOfPublication.latestForDiscoverybca80a86-eb35-4bca-a4ba-85b53831d69e
relation.isProjectOfPublication868b4818-3efa-4edb-9202-c464d64fd38f
relation.isProjectOfPublication.latestForDiscovery868b4818-3efa-4edb-9202-c464d64fd38f

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