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dc.contributor.advisorThordarson, Thorvalduren
dc.contributor.advisorFitton, Godfreyen
dc.contributor.authorMeara, Rhian Hedden
dc.date.accessioned2012-03-27T13:14:50Z
dc.date.available2012-03-27T13:14:50Z
dc.date.issued2012-06-25
dc.identifier.urihttp://hdl.handle.net/1842/5834
dc.description.abstractThe overall aim of this research project has been to develop a reference dataset of 19 Holocene silicic Icelandic tephra layers sourced from the Torfajökull, Askja, Katla, Öræfajökull and Hekla volcanic systems. The dataset comprises geochemical data (including major, trace and rare earth element data for bulk and glass phases collected by XRF, electron microprobe, ion probe and laser ablation ICP-MS) and physical data (including sedimentary logs, field photographs, distribution maps and GPS localities of reference sections). Results indicate that Icelandic volcanic systems show unique geochemical signatures which result from the systems proximity to the active rifting zone and the proposed upwelling mantle plume that underlies the island. Within individual volcanic systems, eruptions produce tephra with distinct geochemical characteristics, which allow for the independent confirmation of tephra identity. The identification and discrimination of tephra layers can in some cases be achieved using major element chemistry (e.g. Hekla, H1104 – H5) while other tephra layers can only be discriminated using trace element chemistry (e.g. Torfajökull, Landnám and Gràkolla). Certain tephra layers however show near-identical geochemistry and therefore discrimination is not possible (e.g. Hekla, HA, HB, HC, HM, HN, HX, HY, HZ) without the incorporation of other proxy data. Icelandic micro-tephra horizons are identified in soil, lacustrine and marine sedimentary sequences and are used for dating and correlation in Quaternary studies. Data collected for this project will facilitate reliable data comparison and tephra identification between proximal and distal localities across the North Atlantic region. The data may also contribute to the debate regarding the formation of silicic rocks within Iceland, particularly with regard to the Hekla central volcano. The geochemical data collected for this thesis shows distinct age-dependant geochemical sub-groups suggesting temporal sub-surface relocation of the Hekla magma source.en
dc.language.isoen
dc.publisherThe University of Edinburghen
dc.relation.hasversionLARSEN, G., THORDARSON, TH., HOSKULDSSON, A., GUDMUNDSSON, M. T., SVERRISDOTTIR, G., ODDSON, B., OSKARSSON, B. V., JONSDOTTIR, I., OLADOTTIR, B., THORSTEINSSON, T., HARTLEY, M. E. AND MEARA, R. 2010. On-land distribution and modes of deposition of the Eyjafjallajökull 2010 tephra. American Geophysical Union, Fall Meeting 2010, abstract #V53F-04.en
dc.subjectIcelanden
dc.subjectsilicicen
dc.subjectfingerprinten
dc.subjecttephraen
dc.titleGeochemical fingerprinting of Icelandic silicic Holocene tephra layersen
dc.typeThesis or Dissertationen
dc.type.qualificationlevelDoctoralen
dc.type.qualificationnamePhD Doctor of Philosophyen


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