Show simple item record

dc.contributor.authorAndrews, JT
dc.contributor.authorMcCave, Ian Nicholas
dc.contributor.authorSyvitski, J
dc.date.accessioned2022-01-06T00:30:05Z
dc.date.available2022-01-06T00:30:05Z
dc.date.issued2021-06
dc.identifier.issn0921-8181
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/332105
dc.description.abstractCore MD99-2323 was extracted from the Snorri Drift at a water depth of 1062 m, just south of the Denmark Strait, and ~120 km from the Last Glacial Maximum (LGM) margins of the Iceland and East Greenland Ice Sheets. The core chronology (~7.5 to 240 cal ka) is derived from radiocarbon dates, marker tephra, paleomagnetic excursion, and correlation with North Atlantic δ18O records on Neogloboquadrina pachyderma (δ18ONp). Sedimentation averaged ~7.5 cm/kyr. Records of proxy flow speed, ice rafted debris (IRD) and oxygen isotopes show that many IRD abundance peaks represent winnowing of the fine fraction by faster flows rather than pulses of increased IRD flux. The overall pattern of flow speed does not resemble the classic fast interglacial/slow glacial pattern seen in records of Nordic Sea overflow, rather the current record is suggested to be partly controlled by the production of brine-driven gravity flows from adjacent ice fronts, especially during cold periods. On a smaller scale the usual glacial/slow – interglacial/fast pattern appears to be the case during ~5 kyr oscillations during Marine Isotope Stage (MIS) 6 where periodic low flow speed is matched by high values of planktonic oxygen isotope ratios. Eight peaks in quartz wt% reflect increased contributions from glacial erosion of Precambrian and Caledonian bedrock from E and NE Greenland; peaks in dolomite may reflect glacial-marine transport from the Laurentide Ice Sheet. Cross wavelet analysis of the δ18ONp versus sortable silt and quartz records indicate significant precession and obliquity periodicities, but with little temporal correlations due to leads and lags in responses.
dc.publisherElsevier BV
dc.rightsAll Rights Reserved
dc.rights.urihttp://www.rioxx.net/licenses/all-rights-reserved
dc.subjectSnorri Drift
dc.subjectDeep Northern Boundary Current
dc.subjectMIS 1-7
dc.subjectMineral composition
dc.subjectSortable silt
dc.subjectFlow speed
dc.subjectSaline gravity current
dc.subjectIRD
dc.titleA ~240 ka record of Ice Sheet and Ocean interactions on the Snorri Drift, SW of Iceland
dc.typeArticle
dc.publisher.departmentDepartment of Earth Sciences
dc.date.updated2021-12-08T10:16:12Z
prism.endingPage103498
prism.numberARTN 103498
prism.publicationDate2021
prism.publicationNameGlobal and Planetary Change
prism.startingPage103498
prism.volume201
dc.identifier.doi10.17863/CAM.79551
rioxxterms.versionofrecord10.1016/j.gloplacha.2021.103498
rioxxterms.versionAM
dc.contributor.orcidMcCave, Ian Nicholas [0000-0002-4702-5489]
dc.identifier.eissn1872-6364
rioxxterms.typeJournal Article/Review
cam.orpheus.success2022-01-05 - Embargo set during processing via Fast-track
cam.depositDate2021-12-08
pubs.licence-identifierapollo-deposit-licence-2-1
pubs.licence-display-nameApollo Repository Deposit Licence Agreement
rioxxterms.freetoread.startdate2022-06-30


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record