Consulta: subjectFacets:"British-Irish Ice Sheet"
Registros recuperados: 5
Data/hora: 10/06/2024 14:31:29

Growth and decay of a marine terminating sector of the last British-Irish Ice Sheet: a geomorphological reconstruction
Provedor de dados: 5
Autores: Finlayson, Andrew; Fabel, Derek; Bradwell, Tom; Sugden, David.
The boundary conditions that govern ice sheet dynamics can change significantly with the development of marine margins. This paper uses the glacial landscape in western Scotland to reconstruct changes in the British-Irish Ice Sheet that accompanied the growth and decay of a marine sector over the Malin Shelf. Ice advanced from a restricted mountain ice sheet with tidewater margins after similar to 35 ka BP, and reached the continental shelf in similar to 7 ka (average rate of similar to 30 m a(-1)). Early ice flow had been directed through north-south, geologically controlled, over-deepened fjords that were carved during previous 'restricted' glaciations. This flow regime was abandoned with development of the Malin Shelf ice sheet sector; ice flow...
Tipo: Text
Palavras-chave: British-Irish Ice Sheet; Glacial landscape; Palaeoglaciology; Marine terminating; Malin Shelf.
Ano: 2014
URL: https://archimer.ifremer.fr/doc/00291/40240/83001.pdf

Extent and retreat history of the Barra Fan Ice Stream offshore western Scotland and northern Ireland during the last glaciation
Provedor de dados: 5
Autores: Callard, S. Louise; Cofaigh, Colm O.; Benetti, Sara; Chiverrell, Richard C.; Van Landeghem, Katrien J. J.; Saher, Margot H.; Gales, Jenny A.; Small, David; Clark, Chris D.; Stephen, J. Livingstone; Fabel, Derek; Moreton, Steven G.
During the Last Glacial Maximum (LGM) the marine-terminating Barra Fan Ice Stream (BFIS), a major conduit of the British Irish Ice Sheet (BITS), drained much of western Scotland and northwest Ireland with ice streaming onto the continental shelf of the Malin Sea. The extent and retreat history of this ice stream across the shelf, until now, is not well known. In particular, geochronological constraints on the history of this ice stream have thus far been restricted to deep-sea cores or terrestrial cosmogenic nuclide dating onshore, with ages across the shelf absent. To understand the possible external forcing factors acting on this marine terminating ice stream during retreat, improved geochronological constraint on its deglaciation is necessary. Here, we...
Tipo: Text
Palavras-chave: British-Irish Ice Sheet; Glacimarine; Last glacial maximum; Radiocarbon dating; Ice-sheet retreat; Grounding-zone wedges.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00504/61588/65891.pdf

The deglaciation of the northwest sector of the last British-Irish ice sheet : integrating onshore and offshore data relating to chronology and behaviour
Provedor de dados: 5
Autores: Small, David.
It is now accepted that the last British-Irish Ice Sheet (BIIS) was highly dynamic and drained by numerous fast flowing ice streams. This dynamic nature combined with its maritime location made the BIIS sensitive to the rapid climate change that characterised the Last Glacial Interglacial Transition. Gaining an understanding of the behaviour of the BIIS at this time is important to explore the nature of forcing between ice sheets and climate. This thesis presents new chronological data relating to the deglaciation of the northwest sector of the BIIS (NW-BIIS) from onshore dating of moraines using cosmogenic exposure dating. This improved chronological framework is supported by offshore data in the form of a newly constructed Ice Rafted Detritus (IRD)...
Tipo: Text
Palavras-chave: British-Irish Ice Sheet; Deglaciation; Cosmogenic; Ice rafted detritus; Provenance; Environmental change.
Ano: 2013
URL: https://archimer.ifremer.fr/doc/00499/61039/64446.pdf

Devising quality assurance procedures for assessment of legacy geochronological data relating to deglaciation of the last British-Irish Ice Sheet
Provedor de dados: 5
Autores: Small, David; Clark, Chris D.; Chiverrell, Richard C.; Smedley, Rachel K.; Bateman, Mark D.; Duller, Geoff A. T.; Ely, Jeremy C.; Fabel, Derek; Medialdea, Alicia; Moreton, Steven G.
This contribution documents the process of assessing the quality of data within a compilation of legacy geochronological data relating to the last British-Irish Ice Sheet, a task undertaken as part of a larger community-based project (BRITICE-CHRONO) that aims to improve understanding of the ice sheet's deglacial evolution. As accurate reconstructions depend on the quality of the available data, some form of assessment is needed of the reliability and suitability of each given age(s) in our dataset. We outline the background considerations that informed the quality assurance procedures devised given our specific research question. We describe criteria that have been used to make an objective assessment of the likelihood that an age is influenced by the...
Tipo: Text
Palavras-chave: British-Irish Ice Sheet; Deglaciation; Geochronology; Data compilations; Quality assurance; Bayesian.
Ano: 2017
URL: https://archimer.ifremer.fr/doc/00504/61598/65865.pdf

The Last Scottish Ice Sheet
Provedor de dados: 5
Autores: Ballantyne, Colin K.; Small, David.
The last Scottish Ice Sheet (SIS) expanded from a pre-existing ice cap after ∼35 ka. Highland ice dominated, with subsequent build-up of a Southern Uplands ice mass. The Outer Hebrides, Skye, Mull, the Cairngorms and Shetland supported persistent independent ice centres. Expansion was accompanied by ice-divide migration and switching flow directions. Ice nourished in Scotland reached the Atlantic Shelf break in some sectors but only mid-shelf in others, was confluent with the Fennoscandian Ice Sheet (FIS) in the North Sea Basin, extended into northern England, and fed the Irish Sea Ice Stream and a lobe that reached East Anglia. The timing of maximum extent was diachronous, from ∼30–27 ka on the Atlantic Shelf to ∼22–21 ka in Yorkshire. The SIS buried all...
Tipo: Text
Palavras-chave: British-Irish Ice Sheet; Deglaciation; Dimlington Stade; Flowsets; Ice streams; Late Devensian; Lithostratigraphy; Radiocarbon dating; Readvances; Terrestrial cosmogenic nuclide dating.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00505/61627/65539.pdf