Use this URL to cite or link to this record in EThOS: http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.598894
Title: Late Weichselian and Holocene glacimarine sedimentation and environments in Kejser Franz Josephs Fjord and on the adjacent continental margin of East Greenland
Author: Evans, J.
Awarding Body: University of Cambridge
Current Institution: University of Cambridge
Date of Award: 1999
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Abstract:
The study outlines the glacimarine sedimentation patterns and processes and environments in the Kejser Franz Josephs Fjord and on the adjacent continental margin of East Greenland during the Late Weichselian and Holocene. A variety of techniques are adopted in the study in order to address the objectives outlined previously. The study is based on a suite of 8 cores from the mid to outer region of Kejser Franze Josephs Fjord, and the continental shelf and slope. Core analyses included i) logging (core and x-radiographs), ii) determination of grain size distribution, iceberg rafted debris and physical properties (water content, porosity, grain density), iii) determination of stable oxygen and carbon isotopes, iv) radiocarbon dating, and v) calculation of sedimentation and accumulation rates. Additionally, acoustic data is incorporated into the study to place the sediment cores within a regional context in terms of the sedimentation patterns and processes throughout the study area. The sedimentary record within the study dates back to the Late Weicheselian glaciation. The sedimentary record corresponding to the Late Weicheselian glaciation is confined to the continental slope, and partly the continental shelf. The nature, timing, extent and mechanisms of ice advance during the Late Weichselian glaciation could not be determined in the study. The upper continental slope is characterised by iceberg sedimentation with additional contribution from distal remnants of meltwater outflows escaping from East Greenland, sea ice rafting and pelagic settling. Mass wasting is recognised by the presence of debris flows, which are derived from the rapid and unstable build-up of large volumes of glacigenic sediment. Mass wasting events are intermittent, vary from small to large scale, and are derived from local slope regions. The mid to lower continental slope are characterised by rain out and suspension settling punctuated by intermittent sediment gravity flows. Sea ice conditions during the Late Weichselian are extended resulting in reduced ventilation of ocean surface waters and decreased exchange of CO2 between the atmosphere and ocean. Sedimentation rates are high in relation to sedimentation being focused onto the continental margin as ice advances to the inner continental shelf.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.598894  DOI: Not available
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