Citation for published item:etersD tFvF nd fenettiD F nd hunlopD F nd ¡ y gofighD gF nd woretonD FqF nd heelerD eFtF nd glrkD gFhF @PHITA 9edimentology nd hronology of the dvne nd retret of the lst fritishEsrish se heet on the ontinentl shelf west of srelndF9D uternry siene reviewsFD IRH F ppF IHIEIPRF Further information on publisher's website:
Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details.
Abstract
12The last British-Irish Ice Sheet (BIIS) had extensive marine-terminating margins and was 13 drained by multiple large ice streams and is thus a useful analogue for marine-based areas of modern 14 ice sheets. However, despite recent advances from investigating the offshore record of the BIIS, the 15 dynamic history of its marine margins, which would have been sensitive to external forcing(s), remain 16 inadequately understood. This study is the first reconstruction of the retreat dynamics and chronology 17 of the western, marine-terminating, margin of the last (Late Midlandian) BIIS. Analyses of shelf 18 geomorphology and core sedimentology and chronology enable a reconstruction of the Late 19Midlandian history of the BIIS west of Ireland, from initial advance to final retreat onshore. Five 20 AMS radiocarbon dates from marine cores constrain the timing of retreat and associated readvances 21 during deglaciation. The BIIS advanced without streaming or surging, depositing a bed of highly 22 consolidated subglacial traction till, and reached to within ~20 km of the shelf break by ~24,000 Cal 23 BP. Ice margin retreat was likely preceded by thinning, grounding zone retreat and ice shelf 24 does not allow us to determine conclusively whether these readvances were a glaciodynamic 38 (internally-driven) response of the ice sheet during deglaciation or were climatically-driven. 39Following the <18,500 Cal BP readvance, the Galway Lobe experienced accelerated eastward retreat 40 at an estimated rate of ~113 m/yr. 41
Citation for published item:etersD tFvF nd fenettiD F nd hunlopD F nd ¡ y gof ighD gF @PHISA 9w ximum extent nd dyn mi eh viour of the l st fritish!srish s e heet west of srel ndF9D u tern ry s ien e reviewsFD IPV F ppF RVETVF Further information on publisher's website:
Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. years. Estimated retreat rates of marine-terminating ice across the shelf range from ~70-180myr -1 . 21
Palaeoenvironmental change following deglaciation of the last British–Irish Ice Sheet on the continental shelf west of Ireland was investigated using multiproxy analyses of sediment and foraminifera data from nine sediment cores. Lithofacies associations record various depositional regimes across the shelf, which evolve from subglacial to postglacial conditions. Census data provide the first characterisation of benthic foraminifera populations across the continental shelf and multivariate analyses reveal three distinct biotopes. Biomineralization within these biotopes is restricted to ≤21 200 cal a bp by four radiocarbon ages. The transition from glacial to postglacial benthic foraminifera populations near the shelf break marks the establishment of productive, nutrient‐rich, ice‐distal conditions at ~20 900 cal a bp; these conditions may also mark the start of favourable conditions for postglacial cold‐water coral growth. Postglacial conditions on the inner shelf were not established until <14 500 cal a bp, suggesting glacial conditions west of Ireland may have persisted into the Bølling–Allerød Interstadial.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.