• Login
    View Item 
    •   Home
    • Events
    • Research Day
    • Research Day 2021
    • Undergraduate Posters
    • View Item
    •   Home
    • Events
    • Research Day
    • Research Day 2021
    • Undergraduate Posters
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Browse

    All of SSDRCommunitiesPublication DateAuthorsTitlesSubjectsThis CollectionPublication DateAuthorsTitlesSubjects

    My Account

    LoginRegister

    Digital Repository Deposit Agreement

    Statistics

    Most Popular ItemsStatistics by CountryMost Popular Authors

    A Late Glacial to Holocene Sediment Record of Ice-Rafted Detritus from Orphan Knoll, Northwest Atlantic Ocean

    • CSV
    • RefMan
    • EndNote
    • BibTex
    • RefWorks
    Thumbnail
    Name:
    Anastopoulos_Kristen_Anastopou ...
    Size:
    1.677Mb
    Format:
    Microsoft PowerPoint 2007
    DownloadPDF Variant
    Title
    A Late Glacial to Holocene Sediment Record of Ice-Rafted Detritus from Orphan Knoll, Northwest Atlantic Ocean
    Author
    Anastopoulos, Kristen M.
    Cullen, James L.
    Date
    May 2021
    Subject
    Atlantic
    Detrital
    Heinrich Event
    IRD
    Sediment
    
    Metadata
    Show full item record
    URI
    http://hdl.handle.net/20.500.13013/1512
    Abstract
    High-resolution sediment records from North Atlantic deep-sea sediments have been used to document millennial-scale abrupt climate oscillations during the last glacial cycle. A five-meter core (DY081-GVY002) was recovered from the Orphan Knoll, Northwest Atlantic Ocean during the RRS Discovery Cruise ICY LAB in 2017. Forty-closely spaced samples from the top 65cm (1-2 cm spacing) have been used to generate two proxies that record changes in the input of ice-rafted detritus (IRD): IRD/g, lithic grains >150µm per gram of sediment, %IRD ((number of lithic grains >150µm) / (number of lithic grains >150µm + number of planktic foraminifers >150µm)) x 100). Our record, which significantly improves the resolution previously presented by Gugliemli et al. (2020), reveals a series of abrupt increases in IRD input ranging from 4,000-7,200 lithic grains/g within a background of 3,000 or less lithic grains/g, at 5cm, 10cm, 25cm, 38cm and 44cm. The %IRD record reveals high values over the interval of 34cm-55cm that correspond to high IRD/g input which can be correlated to an interval of high Ca/Sr ratios, a proxy that has been previously used to indicate the input of detrital carbonates composed of dolomite and/or inorganic calcite (Hodell et al. 2008). We have preliminarily correlated this interval to Heinrich event 1 (H1), one of a series of abrupt increases in IRD input that occurred throughout the North Atlantic during the last glacial (MIS 4-2); (Heinrich 1988). Another high interval in the Ca/Sr ratio occurs at 12-15cm this corresponds to a peak in %IRD, we have preliminarily correlated this interval as Heinrich event 0 (H0). Our data suggests a closer relationship between %IRD and Ca/Sr proxies, whereas IRD/g is more easily influenced by other factors. The other peaks in IRD/g that also record low %IRD occur when Ca/Sr ratios are at lower background levels, suggesting the decoupling of these proxies for reasons we have not been able to explain yet.
    Sponsor
    Cullen, James
    Collections
    Undergraduate Posters

    entitlement

     
    DSpace software (copyright © 2002 - 2025)  DuraSpace
    Quick Guide | Contact Us
    Open Repository is a service operated by 
    Atmire NV
     

    Export search results

    The export option will allow you to export the current search results of the entered query to a file. Different formats are available for download. To export the items, click on the button corresponding with the preferred download format.

    By default, clicking on the export buttons will result in a download of the allowed maximum amount of items.

    To select a subset of the search results, click "Selective Export" button and make a selection of the items you want to export. The amount of items that can be exported at once is similarly restricted as the full export.

    After making a selection, click one of the export format buttons. The amount of items that will be exported is indicated in the bubble next to export format.