DataSheet1_Microstructure and Crystallographic Preferred Orientations of an Azimuthally Oriented Ice Core from a Lateral Shear Margin: Priestley Glacier, Antarctica.PDF
A 58 m long azimuthally oriented ice core has been collected from the floating lateral sinistral shear margin of the lower Priestley Glacier, Terra Nova Bay, Antarctica. The crystallographic preferred orientations (CPO) and microstructures are described in order to correlate the geometry of anisotro...
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ftfrontimediafig:oai:figshare.com:article/17084660 2023-05-15T13:53:14+02:00 DataSheet1_Microstructure and Crystallographic Preferred Orientations of an Azimuthally Oriented Ice Core from a Lateral Shear Margin: Priestley Glacier, Antarctica.PDF Rilee E. Thomas Marianne Negrini David J. Prior Robert Mulvaney Holly Still M. Hamish Bowman Lisa Craw Sheng Fan Bryn Hubbard Christina Hulbe Daeyeong Kim Franz Lutz 2021-11-26T05:29:22Z https://doi.org/10.3389/feart.2021.702213.s001 https://figshare.com/articles/dataset/DataSheet1_Microstructure_and_Crystallographic_Preferred_Orientations_of_an_Azimuthally_Oriented_Ice_Core_from_a_Lateral_Shear_Margin_Priestley_Glacier_Antarctica_PDF/17084660 unknown doi:10.3389/feart.2021.702213.s001 https://figshare.com/articles/dataset/DataSheet1_Microstructure_and_Crystallographic_Preferred_Orientations_of_an_Azimuthally_Oriented_Ice_Core_from_a_Lateral_Shear_Margin_Priestley_Glacier_Antarctica_PDF/17084660 CC BY 4.0 CC-BY Solid Earth Sciences Climate Science Atmospheric Sciences not elsewhere classified Exploration Geochemistry Inorganic Geochemistry Isotope Geochemistry Organic Geochemistry Geochemistry not elsewhere classified Igneous and Metamorphic Petrology Ore Deposit Petrology Palaeontology (incl. Palynology) Structural Geology Tectonics Volcanology Geology not elsewhere classified Seismology and Seismic Exploration Glaciology Hydrogeology Natural Hazards Quaternary Environments Earth Sciences not elsewhere classified Evolutionary Impacts of Climate Change lateral glacial shear margin crystallographic preferred orientations ice microstructure ice deformation and flow electron backscatter diffraction Priestley Glacier Dataset 2021 ftfrontimediafig https://doi.org/10.3389/feart.2021.702213.s001 2021-12-02T00:03:03Z A 58 m long azimuthally oriented ice core has been collected from the floating lateral sinistral shear margin of the lower Priestley Glacier, Terra Nova Bay, Antarctica. The crystallographic preferred orientations (CPO) and microstructures are described in order to correlate the geometry of anisotropy with constrained large-scale kinematics. Cryogenic Electron Backscatter Diffraction analysis shows a very strong fabric (c-axis primary eigenvalue ∼0.9) with c-axes aligned horizontally sub-perpendicular to flow, rotating nearly 40° clockwise (looking down) to the pole to shear throughout the core. The c-axis maximum is sub-perpendicular to vertical layers, with the pole to layering always clockwise of the c-axes. Priestley ice microstructures are defined by largely sub-polygonal grains and constant mean grain sizes with depth. Grain long axis shape preferred orientations (SPO) are almost always 1–20° clockwise of the c-axis maximum. A minor proportion of “oddly” oriented grains that are distinct from the main c-axis maximum, are present in some samples. These have horizontal c-axes rotated clockwise from the primary c-axis maximum and may define a weaker secondary maximum up to 30° clockwise of the primary maximum. Intragranular misorientations are measured along the core, and although the statistics are weak, this could suggest recrystallization by subgrain rotation to occur. These microstructures suggest subgrain rotation (SGR) and recrystallization by grain boundary migration recrystallization (GBM) are active in the Priestley Glacier shear margin. Vorticity analysis based on intragranular distortion indicates a vertical axis of rotation in the shear margin. The variability in c-axis maximum orientation with depth indicates the structural heterogeneity of the Priestley Glacier shear margin occurs at the meter to tens of meters scale. We suggest that CPO rotations could relate to rigid rotation of blocks of ice within the glacial shear margin. Rotation either post-dates CPO and SPO development or is occurring ... Dataset Antarc* Antarctica ice core Priestley Glacier Frontiers: Figshare Terra Nova Bay Priestley ENVELOPE(161.883,161.883,-75.183,-75.183) Priestley Glacier ENVELOPE(163.367,163.367,-74.333,-74.333) |
institution |
Open Polar |
collection |
Frontiers: Figshare |
op_collection_id |
ftfrontimediafig |
language |
unknown |
topic |
Solid Earth Sciences Climate Science Atmospheric Sciences not elsewhere classified Exploration Geochemistry Inorganic Geochemistry Isotope Geochemistry Organic Geochemistry Geochemistry not elsewhere classified Igneous and Metamorphic Petrology Ore Deposit Petrology Palaeontology (incl. Palynology) Structural Geology Tectonics Volcanology Geology not elsewhere classified Seismology and Seismic Exploration Glaciology Hydrogeology Natural Hazards Quaternary Environments Earth Sciences not elsewhere classified Evolutionary Impacts of Climate Change lateral glacial shear margin crystallographic preferred orientations ice microstructure ice deformation and flow electron backscatter diffraction Priestley Glacier |
spellingShingle |
Solid Earth Sciences Climate Science Atmospheric Sciences not elsewhere classified Exploration Geochemistry Inorganic Geochemistry Isotope Geochemistry Organic Geochemistry Geochemistry not elsewhere classified Igneous and Metamorphic Petrology Ore Deposit Petrology Palaeontology (incl. Palynology) Structural Geology Tectonics Volcanology Geology not elsewhere classified Seismology and Seismic Exploration Glaciology Hydrogeology Natural Hazards Quaternary Environments Earth Sciences not elsewhere classified Evolutionary Impacts of Climate Change lateral glacial shear margin crystallographic preferred orientations ice microstructure ice deformation and flow electron backscatter diffraction Priestley Glacier Rilee E. Thomas Marianne Negrini David J. Prior Robert Mulvaney Holly Still M. Hamish Bowman Lisa Craw Sheng Fan Bryn Hubbard Christina Hulbe Daeyeong Kim Franz Lutz DataSheet1_Microstructure and Crystallographic Preferred Orientations of an Azimuthally Oriented Ice Core from a Lateral Shear Margin: Priestley Glacier, Antarctica.PDF |
topic_facet |
Solid Earth Sciences Climate Science Atmospheric Sciences not elsewhere classified Exploration Geochemistry Inorganic Geochemistry Isotope Geochemistry Organic Geochemistry Geochemistry not elsewhere classified Igneous and Metamorphic Petrology Ore Deposit Petrology Palaeontology (incl. Palynology) Structural Geology Tectonics Volcanology Geology not elsewhere classified Seismology and Seismic Exploration Glaciology Hydrogeology Natural Hazards Quaternary Environments Earth Sciences not elsewhere classified Evolutionary Impacts of Climate Change lateral glacial shear margin crystallographic preferred orientations ice microstructure ice deformation and flow electron backscatter diffraction Priestley Glacier |
description |
A 58 m long azimuthally oriented ice core has been collected from the floating lateral sinistral shear margin of the lower Priestley Glacier, Terra Nova Bay, Antarctica. The crystallographic preferred orientations (CPO) and microstructures are described in order to correlate the geometry of anisotropy with constrained large-scale kinematics. Cryogenic Electron Backscatter Diffraction analysis shows a very strong fabric (c-axis primary eigenvalue ∼0.9) with c-axes aligned horizontally sub-perpendicular to flow, rotating nearly 40° clockwise (looking down) to the pole to shear throughout the core. The c-axis maximum is sub-perpendicular to vertical layers, with the pole to layering always clockwise of the c-axes. Priestley ice microstructures are defined by largely sub-polygonal grains and constant mean grain sizes with depth. Grain long axis shape preferred orientations (SPO) are almost always 1–20° clockwise of the c-axis maximum. A minor proportion of “oddly” oriented grains that are distinct from the main c-axis maximum, are present in some samples. These have horizontal c-axes rotated clockwise from the primary c-axis maximum and may define a weaker secondary maximum up to 30° clockwise of the primary maximum. Intragranular misorientations are measured along the core, and although the statistics are weak, this could suggest recrystallization by subgrain rotation to occur. These microstructures suggest subgrain rotation (SGR) and recrystallization by grain boundary migration recrystallization (GBM) are active in the Priestley Glacier shear margin. Vorticity analysis based on intragranular distortion indicates a vertical axis of rotation in the shear margin. The variability in c-axis maximum orientation with depth indicates the structural heterogeneity of the Priestley Glacier shear margin occurs at the meter to tens of meters scale. We suggest that CPO rotations could relate to rigid rotation of blocks of ice within the glacial shear margin. Rotation either post-dates CPO and SPO development or is occurring ... |
format |
Dataset |
author |
Rilee E. Thomas Marianne Negrini David J. Prior Robert Mulvaney Holly Still M. Hamish Bowman Lisa Craw Sheng Fan Bryn Hubbard Christina Hulbe Daeyeong Kim Franz Lutz |
author_facet |
Rilee E. Thomas Marianne Negrini David J. Prior Robert Mulvaney Holly Still M. Hamish Bowman Lisa Craw Sheng Fan Bryn Hubbard Christina Hulbe Daeyeong Kim Franz Lutz |
author_sort |
Rilee E. Thomas |
title |
DataSheet1_Microstructure and Crystallographic Preferred Orientations of an Azimuthally Oriented Ice Core from a Lateral Shear Margin: Priestley Glacier, Antarctica.PDF |
title_short |
DataSheet1_Microstructure and Crystallographic Preferred Orientations of an Azimuthally Oriented Ice Core from a Lateral Shear Margin: Priestley Glacier, Antarctica.PDF |
title_full |
DataSheet1_Microstructure and Crystallographic Preferred Orientations of an Azimuthally Oriented Ice Core from a Lateral Shear Margin: Priestley Glacier, Antarctica.PDF |
title_fullStr |
DataSheet1_Microstructure and Crystallographic Preferred Orientations of an Azimuthally Oriented Ice Core from a Lateral Shear Margin: Priestley Glacier, Antarctica.PDF |
title_full_unstemmed |
DataSheet1_Microstructure and Crystallographic Preferred Orientations of an Azimuthally Oriented Ice Core from a Lateral Shear Margin: Priestley Glacier, Antarctica.PDF |
title_sort |
datasheet1_microstructure and crystallographic preferred orientations of an azimuthally oriented ice core from a lateral shear margin: priestley glacier, antarctica.pdf |
publishDate |
2021 |
url |
https://doi.org/10.3389/feart.2021.702213.s001 https://figshare.com/articles/dataset/DataSheet1_Microstructure_and_Crystallographic_Preferred_Orientations_of_an_Azimuthally_Oriented_Ice_Core_from_a_Lateral_Shear_Margin_Priestley_Glacier_Antarctica_PDF/17084660 |
long_lat |
ENVELOPE(161.883,161.883,-75.183,-75.183) ENVELOPE(163.367,163.367,-74.333,-74.333) |
geographic |
Terra Nova Bay Priestley Priestley Glacier |
geographic_facet |
Terra Nova Bay Priestley Priestley Glacier |
genre |
Antarc* Antarctica ice core Priestley Glacier |
genre_facet |
Antarc* Antarctica ice core Priestley Glacier |
op_relation |
doi:10.3389/feart.2021.702213.s001 https://figshare.com/articles/dataset/DataSheet1_Microstructure_and_Crystallographic_Preferred_Orientations_of_an_Azimuthally_Oriented_Ice_Core_from_a_Lateral_Shear_Margin_Priestley_Glacier_Antarctica_PDF/17084660 |
op_rights |
CC BY 4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.3389/feart.2021.702213.s001 |
_version_ |
1766258201256263680 |