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    The ridges of the northern Porcupine Bank, west of Ireland: discussion on their structure, sedimentology and potential subglacial origin


    Thébaudeau, Benjamin and McCarron, Stephen and Monteys, Xavier and Renken, Sabrina (2016) The ridges of the northern Porcupine Bank, west of Ireland: discussion on their structure, sedimentology and potential subglacial origin. Geophysical Research Abstracts, 18. p. 6395.

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    Abstract

    Recent publications have highlighted the over-consolidation of diamicts found in shallow sediment cores on ornear seabed ridges from the north east of the Porcupine Bank, a bathymetric high >150km west of central Irelandin the northeast Atlantic Ocean. These observations have led to the interpretation of ridges there as potential endor lateral moraines constraining a maximum advance of the British-Irish Ice Sheet (BIIS) dated to between 24,720and 19,182 Cal. BP. Other cores further east on the western outer Irish shelf are dominated by muds interpretedas proglacial which would indicate a deglaciation from a potential maximum advance by 22,800 Cal. BP. Whilethese conclusions are not incompatible, they do suggest a very rapid advance of a westward tongue of ice of about150km length with little evidence for regressive moraines on the Porcupine Bank.This paper will present the results of analysis of a further 8 cores from the North and North East Porcupine Bankcorrelated with sub-bottom and sparker seismic data. Their sedimentology indicates two distinct diamicts thatare contained within some of the seabed ridges of the area. Hypothesis for the formation of these features willbe presented in light of new foraminiferal data and dates from these cores. Potential scenarios to account for thepresence of grounded ice in the region will then be discussed.

    Item Type: Article
    Keywords: ridges; northern Porcupine Bank; west of Ireland; discussion; structure; sedimentology; subglacial origin;
    Academic Unit: Faculty of Social Sciences > Geography
    Item ID: 12297
    Depositing User: Dr. Stephen McCarron
    Date Deposited: 30 Jan 2020 14:41
    Journal or Publication Title: Geophysical Research Abstracts
    Publisher: EGU General Assemblies
    Refereed: Yes
    URI:

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