Deformation microstructures: Antarctic Ice from EPICA Dronning Maud Land and artificial creep test Ice
Ice, microstructures, subgrain boundaries, recrystallization, flow, deformation. - The primary objective of this thesis is the investigation of microstructures obtained from samples from the EPICA Dronning Maud Land ice core from Antarctica. The goal is to gain understanding of deformation processes...
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Niedersächsische Staats- und Universitätsbibliothek
2007
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ftgbv:oai:gbv.de:opac-de-7:ppn:556828631 2023-05-15T13:33:53+02:00 Deformation microstructures: Antarctic Ice from EPICA Dronning Maud Land and artificial creep test Ice Hamann, Ilka 2007 electronic Elektronische Ressource electronic resource remote Online-Ressource (129 p. = 13854 KB, text and images) graph. Darst. http://webdoc.sub.gwdg.de/ebook/dissts/Bremen/Hamann2007.pdf http://nbn-resolving.de/urn:nbn:de:gbv:46-diss000108890 ger ger Niedersächsische Staats- und Universitätsbibliothek Staats- und Universitätsbibliothek [Host] Parallel auch als Druckausg. vorhanden 551.31201551312 38.43 16,13 ggo geo 2007 ftgbv 2016-12-25T23:09:16Z Ice, microstructures, subgrain boundaries, recrystallization, flow, deformation. - The primary objective of this thesis is the investigation of microstructures obtained from samples from the EPICA Dronning Maud Land ice core from Antarctica. The goal is to gain understanding of deformation processes an deformation-related recrystallization mechanisms using these structures. The structures are visualized with the new microstructure mapping method using the preferred sublimation along defect regions in the crystal. This method enables observation in high resolution as well as overview over a significant sample volume. In order to provide unambiguous proof of their deformational origin and to offer interpretation and characterization, experimental reproduction of the microstructural features are performed using creep tests. Subgrain boundaries and grain-boundary morphology are identified as the most direct effects of deformation and recrystallization processes, which are still easily observable. They can be used additionally to the conventional parameters (grain size, crystal-orientation distribution) to determine these mechanisms. Different sbugrain-boundary types observed in experimentally deformed samples as well as in natural ice indicate several formation processes. Results obtained from this new and novel data suggest a profound reconsideration of the classical tripartition of recrystallization regimes described in the literature in ice sheets. Instead, dynamic recrystallization in two of its forms (rotation recrystallization and strain-induced migration recrystallization) dominates the microstructure evolution in all depth regions of the EDML ice core. Results of systematic microstructure analysis of creep-test samples demonstrate . Zsfassung in dt. und engl. Sprache @Bremen, Univ., Diss., 2007 Other/Unknown Material Antarc* Antarctic Antarctica Dronning Maud Land EPICA ice core Georg-August-Universität Göttingen: GOEDOC Antarctic Dronning Maud Land |
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Open Polar |
collection |
Georg-August-Universität Göttingen: GOEDOC |
op_collection_id |
ftgbv |
language |
German |
topic |
551.31201551312 38.43 16,13 ggo geo |
spellingShingle |
551.31201551312 38.43 16,13 ggo geo Deformation microstructures: Antarctic Ice from EPICA Dronning Maud Land and artificial creep test Ice |
topic_facet |
551.31201551312 38.43 16,13 ggo geo |
description |
Ice, microstructures, subgrain boundaries, recrystallization, flow, deformation. - The primary objective of this thesis is the investigation of microstructures obtained from samples from the EPICA Dronning Maud Land ice core from Antarctica. The goal is to gain understanding of deformation processes an deformation-related recrystallization mechanisms using these structures. The structures are visualized with the new microstructure mapping method using the preferred sublimation along defect regions in the crystal. This method enables observation in high resolution as well as overview over a significant sample volume. In order to provide unambiguous proof of their deformational origin and to offer interpretation and characterization, experimental reproduction of the microstructural features are performed using creep tests. Subgrain boundaries and grain-boundary morphology are identified as the most direct effects of deformation and recrystallization processes, which are still easily observable. They can be used additionally to the conventional parameters (grain size, crystal-orientation distribution) to determine these mechanisms. Different sbugrain-boundary types observed in experimentally deformed samples as well as in natural ice indicate several formation processes. Results obtained from this new and novel data suggest a profound reconsideration of the classical tripartition of recrystallization regimes described in the literature in ice sheets. Instead, dynamic recrystallization in two of its forms (rotation recrystallization and strain-induced migration recrystallization) dominates the microstructure evolution in all depth regions of the EDML ice core. Results of systematic microstructure analysis of creep-test samples demonstrate . Zsfassung in dt. und engl. Sprache @Bremen, Univ., Diss., 2007 |
author2 |
Hamann, Ilka |
title |
Deformation microstructures: Antarctic Ice from EPICA Dronning Maud Land and artificial creep test Ice |
title_short |
Deformation microstructures: Antarctic Ice from EPICA Dronning Maud Land and artificial creep test Ice |
title_full |
Deformation microstructures: Antarctic Ice from EPICA Dronning Maud Land and artificial creep test Ice |
title_fullStr |
Deformation microstructures: Antarctic Ice from EPICA Dronning Maud Land and artificial creep test Ice |
title_full_unstemmed |
Deformation microstructures: Antarctic Ice from EPICA Dronning Maud Land and artificial creep test Ice |
title_sort |
deformation microstructures: antarctic ice from epica dronning maud land and artificial creep test ice |
publisher |
Niedersächsische Staats- und Universitätsbibliothek |
publishDate |
2007 |
url |
http://webdoc.sub.gwdg.de/ebook/dissts/Bremen/Hamann2007.pdf http://nbn-resolving.de/urn:nbn:de:gbv:46-diss000108890 |
geographic |
Antarctic Dronning Maud Land |
geographic_facet |
Antarctic Dronning Maud Land |
genre |
Antarc* Antarctic Antarctica Dronning Maud Land EPICA ice core |
genre_facet |
Antarc* Antarctic Antarctica Dronning Maud Land EPICA ice core |
op_relation |
Parallel auch als Druckausg. vorhanden |
_version_ |
1766046745217728512 |