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dc.contributor.authorSurette, Adam
dc.creatorSurette, Adam
dc.date2021-11-24T14:05:44.000
dc.date.accessioned2021-11-29T12:04:19Z
dc.date.available2021-11-29T12:04:19Z
dc.date.issued2020-05-04
dc.date.submitted2020-05-04T05:34:40-07:00
dc.identifierresearchday/2020/undergradposters/39
dc.identifier.urihttp://hdl.handle.net/20.500.13013/1415
dc.description.abstractHigh resolution records from North Atlantic deep-sea sediment have been instrumental in documenting millennial-scale climate variations during the last glacial cycle (Marine Isotope Stages (MIS) 4 to 1) including variations of Ice-Rafted Detritus (IRD) concentrations related to massive iceberg discharges from glacial continental ice sheets. We have sampled core VM28-89, located within the Ruddiman IRD Belt in the central North Atlantic at 1 cm intervals and produced detailed records of %IRD ((number of lithic grains >150μm / (number of lithic grains >150μm + number of Planktic foraminifers >150μm)) x 100); lithic grains, >150μm per gram of sediment (lithics/gram); planktic foraminifers, >150μm per gram of sediment (forams/gram), and % coarse fraction for the top 1.20 m. The %IRD reveals two relatively long intervals of >90% IRD and very low forams/gram between 42-71 cm and 91-113 cm separated by intervals of very low (10-25%) IRD and higher forams/gram. Lithics/gram exhibits much higher frequency fluctuations during these same intervals reaching upwards of 6,000 lithics/gram in the upper long interval and up to 12,000 lithics/gram in the deeper long interval. Unlike IRD records from farther to the northeast (ODP Site 980 for example), %IRD and lithics/gram show a distinct lack of correlation at higher values. This decoupling is likely due to the effects of significant changes in the input foraminifer shells in the high %IRD intervals. Our records bear a remarkable resemblance to those from a well-dated core to the west, V23-14 (Hemming & Hajdas, 2003), particularly in %IRD. Tentative correlations of our results to the V23-14 chronostratigraphic framework suggests that our two intervals of very high %IRD correspond to Heinrich Events H2 and H4. The two peaks in %IRD in V23-14 identified as Heinrich Events H1 and H3 are more difficult to identify using our IRD results from VM28-89.
dc.titleDetailed Records Of IRD Input From Central North Atlantic Sediment Core VM28-89 During The Last Glacial Cycle (Marine Isotope Stages 4-2)
dc.typeevent
dc.legacy.pubstatuspublished
dc.legacy.ssustatusUndergraduate
dc.contributor.sponsorCullen, James L.
dc.legacy.pubtitleResearch Day
dc.legacy.identifierhttps://digitalcommons.salemstate.edu/cgi/viewcontent.cgi?article=1145&context=researchday&unstamped=1
dc.legacy.identifieritemhttps://digitalcommons.salemstate.edu/researchday/2020/undergradposters/39
dc.subject.keywordSediment
dc.subject.keywordGeology
dc.subject.keywordSediment Core
dc.subject.keywordHeinrich event
dc.subject.keywordNorth Atlantic
dc.subject.keywordGlacial


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