“Late Quaternary ice sheet dynamics and palaeoceanography in the Baffin Bay region”
There remains a lack of data surrounding the timings and dynamics of the initial retreat of the Greenland ice sheet (GIS) from its maximum extent at the end of the last glacial maximum (LGM), with poor chronostratigraphic constraint also present on the timings of major Baffin Bay detrital carbonate...
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ftunidurhamethes:oai:etheses.dur.ac.uk:12676 2023-05-15T15:34:55+02:00 “Late Quaternary ice sheet dynamics and palaeoceanography in the Baffin Bay region” CODLING, PETER 2017 application/pdf http://etheses.dur.ac.uk/12676/ http://etheses.dur.ac.uk/12676/1/Peter_Codling_MRes_Thesis_FINAL.pdf unknown oai:etheses.dur.ac.uk:12676 http://etheses.dur.ac.uk/12676/1/Peter_Codling_MRes_Thesis_FINAL.pdf CODLING, PETER (2017) “Late Quaternary ice sheet dynamics and palaeoceanography in the Baffin Bay region”. Masters thesis, Durham University. http://etheses.dur.ac.uk/12676/ Palaeoceanography LGM BBDC Foraminifera Radiocarbon Baffin-Bay. Thesis NonPeerReviewed 2017 ftunidurhamethes 2022-09-23T14:17:05Z There remains a lack of data surrounding the timings and dynamics of the initial retreat of the Greenland ice sheet (GIS) from its maximum extent at the end of the last glacial maximum (LGM), with poor chronostratigraphic constraint also present on the timings of major Baffin Bay detrital carbonate events (BBDC) during the last deglaciation. This study presents new high-resolution data from two cores extracted from the deep abyssal plain of central Baffin Bay. Two separate radiocarbon dates have been extracted using foraminifera which have been used in the development of an age-depth model; estimating the base of the longer gravity core ‘GC01’ to be approximately 22 ka in age. Samples adequate for radiocarbon dating are few and far between due to intense dissolution of biogenic carbonate in both cores. Measurements of elemental concentrations indicate that significant changes in sediment provenance occurred in central Baffin Bay over the last 22Ka. Substantial amounts of sediment influx from western Greenland occurred during the LGM until approximately 15.8 ka BP when the GIS began its initial stages of retreat as the marine area of Baffin Bay increased. Thereafter the use of sedimentological, geochemical and biological markers alongside radiocarbon dating has captured two separate periods of ice sheet instability associated with the BBDC 1 and BBDC 0 estimated to have occurred between 14.1-13.6 ka BP and 12.7-11.4 ka BP respectively. Further analysis of elemental concentrations attributes these two BBDC events to both be associated with large amounts of sediment influx from northern Baffin Bay i.e. the break-up of the Laurentide (LIS) and the Innuitian Ice Sheets (IIS). When plotted as a timeseries against GISP2 and NGRIP ice core records and regional records of marine palaeoenvironmental, change it is clear that BBDC 1 and BBDC 0 occur out-of-phase with Heinrich event 1 or Heinrich event 0. Instead, BBDC 1 appears to start during the later stages of the Bølling Interstadial and continue into the Allerød ... Thesis Baffin Bay Baffin Bay Baffin Greenland ice core Ice Sheet NGRIP Durham University: Durham e-Theses Baffin Bay Greenland |
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Durham University: Durham e-Theses |
op_collection_id |
ftunidurhamethes |
language |
unknown |
topic |
Palaeoceanography LGM BBDC Foraminifera Radiocarbon Baffin-Bay. |
spellingShingle |
Palaeoceanography LGM BBDC Foraminifera Radiocarbon Baffin-Bay. CODLING, PETER “Late Quaternary ice sheet dynamics and palaeoceanography in the Baffin Bay region” |
topic_facet |
Palaeoceanography LGM BBDC Foraminifera Radiocarbon Baffin-Bay. |
description |
There remains a lack of data surrounding the timings and dynamics of the initial retreat of the Greenland ice sheet (GIS) from its maximum extent at the end of the last glacial maximum (LGM), with poor chronostratigraphic constraint also present on the timings of major Baffin Bay detrital carbonate events (BBDC) during the last deglaciation. This study presents new high-resolution data from two cores extracted from the deep abyssal plain of central Baffin Bay. Two separate radiocarbon dates have been extracted using foraminifera which have been used in the development of an age-depth model; estimating the base of the longer gravity core ‘GC01’ to be approximately 22 ka in age. Samples adequate for radiocarbon dating are few and far between due to intense dissolution of biogenic carbonate in both cores. Measurements of elemental concentrations indicate that significant changes in sediment provenance occurred in central Baffin Bay over the last 22Ka. Substantial amounts of sediment influx from western Greenland occurred during the LGM until approximately 15.8 ka BP when the GIS began its initial stages of retreat as the marine area of Baffin Bay increased. Thereafter the use of sedimentological, geochemical and biological markers alongside radiocarbon dating has captured two separate periods of ice sheet instability associated with the BBDC 1 and BBDC 0 estimated to have occurred between 14.1-13.6 ka BP and 12.7-11.4 ka BP respectively. Further analysis of elemental concentrations attributes these two BBDC events to both be associated with large amounts of sediment influx from northern Baffin Bay i.e. the break-up of the Laurentide (LIS) and the Innuitian Ice Sheets (IIS). When plotted as a timeseries against GISP2 and NGRIP ice core records and regional records of marine palaeoenvironmental, change it is clear that BBDC 1 and BBDC 0 occur out-of-phase with Heinrich event 1 or Heinrich event 0. Instead, BBDC 1 appears to start during the later stages of the Bølling Interstadial and continue into the Allerød ... |
format |
Thesis |
author |
CODLING, PETER |
author_facet |
CODLING, PETER |
author_sort |
CODLING, PETER |
title |
“Late Quaternary ice sheet dynamics and palaeoceanography in the Baffin Bay region” |
title_short |
“Late Quaternary ice sheet dynamics and palaeoceanography in the Baffin Bay region” |
title_full |
“Late Quaternary ice sheet dynamics and palaeoceanography in the Baffin Bay region” |
title_fullStr |
“Late Quaternary ice sheet dynamics and palaeoceanography in the Baffin Bay region” |
title_full_unstemmed |
“Late Quaternary ice sheet dynamics and palaeoceanography in the Baffin Bay region” |
title_sort |
“late quaternary ice sheet dynamics and palaeoceanography in the baffin bay region” |
publishDate |
2017 |
url |
http://etheses.dur.ac.uk/12676/ http://etheses.dur.ac.uk/12676/1/Peter_Codling_MRes_Thesis_FINAL.pdf |
geographic |
Baffin Bay Greenland |
geographic_facet |
Baffin Bay Greenland |
genre |
Baffin Bay Baffin Bay Baffin Greenland ice core Ice Sheet NGRIP |
genre_facet |
Baffin Bay Baffin Bay Baffin Greenland ice core Ice Sheet NGRIP |
op_relation |
oai:etheses.dur.ac.uk:12676 http://etheses.dur.ac.uk/12676/1/Peter_Codling_MRes_Thesis_FINAL.pdf CODLING, PETER (2017) “Late Quaternary ice sheet dynamics and palaeoceanography in the Baffin Bay region”. Masters thesis, Durham University. http://etheses.dur.ac.uk/12676/ |
_version_ |
1766365189783945216 |