Dynamics and GPR stratigraphy of a polar rock glacier on James Ross Island, Antarctic Peninsula

We describe field measurements (ground-penetrating radar (GPR), geodetic survey and ice-core drilling) to provide new information on the movement mechanism and internal structure of a polar rock glacier on James Ross Island, Antarctic Peninsula. We collected GPR data along longitudinal and transvers...

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Autores principales: Fukui, K., Sone, T., Strelin, J.A., Torielli, C.A., Mori, J., Fujii, Y.
Formato: JOUR
Lenguaje:English
Materias:
basal ice
data processing
debris flow
field method
geodesy
glacier dynamics
ground penetrating radar
polar region
rock glacier
stratigraphy
valley glacier
Antarctic Peninsula
Antarctica
James Ross Island
West Antarctica
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00221430_v54_n186_p445_Fukui
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_00221430_v54_n186_p445_Fukui2023-10-03T14:27:34Z Dynamics and GPR stratigraphy of a polar rock glacier on James Ross Island, Antarctic Peninsula Fukui, K. Sone, T. Strelin, J.A. Torielli, C.A. Mori, J. Fujii, Y. basal ice data processing debris flow field method geodesy glacier dynamics ground penetrating radar polar region rock glacier stratigraphy valley glacier Antarctic Peninsula Antarctica James Ross Island West Antarctica We describe field measurements (ground-penetrating radar (GPR), geodetic survey and ice-core drilling) to provide new information on the movement mechanism and internal structure of a polar rock glacier on James Ross Island, Antarctic Peninsula. We collected GPR data along longitudinal and transverse profiles. The longitudinal GPR profiles identify inter-bedded debris-rich layers that dip up-glacier, similar to the thrust structures in the compression zone of a valley glacier. The transverse GPR profiles indicate a syncline structure inclined towards the central part of the rock glacier, resembling the transverse foliation of a valley glacier. The stratigraphy of two boreholes shows that the rock glacier consists primarily of bubbly ice with thin debris-rich layers, an internal structure similar to the 'nested spoons' structure common in the interior of valley glaciers. These results indicate that the glacier motion is controlled by shear movement, common in valley glaciers. The geodetic survey confirms that flow velocities decrease towards the lower part of the rock glacier. Such heterogeneous movement causes longitudinal compression and forms thrusts which then create the debris-rich layer by uplifting basal ice and debris. Pushing of the upstream ice against the downstream ice bends the surface layers, forming transverse ridges on the rock glacier surface. Fil:Strelin, J.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR English info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00221430_v54_n186_p445_Fukui
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
language English
orig_language_str_mv English
topic basal ice
data processing
debris flow
field method
geodesy
glacier dynamics
ground penetrating radar
polar region
rock glacier
stratigraphy
valley glacier
Antarctic Peninsula
Antarctica
James Ross Island
West Antarctica
spellingShingle basal ice
data processing
debris flow
field method
geodesy
glacier dynamics
ground penetrating radar
polar region
rock glacier
stratigraphy
valley glacier
Antarctic Peninsula
Antarctica
James Ross Island
West Antarctica
Fukui, K.
Sone, T.
Strelin, J.A.
Torielli, C.A.
Mori, J.
Fujii, Y.
Dynamics and GPR stratigraphy of a polar rock glacier on James Ross Island, Antarctic Peninsula
topic_facet basal ice
data processing
debris flow
field method
geodesy
glacier dynamics
ground penetrating radar
polar region
rock glacier
stratigraphy
valley glacier
Antarctic Peninsula
Antarctica
James Ross Island
West Antarctica
description We describe field measurements (ground-penetrating radar (GPR), geodetic survey and ice-core drilling) to provide new information on the movement mechanism and internal structure of a polar rock glacier on James Ross Island, Antarctic Peninsula. We collected GPR data along longitudinal and transverse profiles. The longitudinal GPR profiles identify inter-bedded debris-rich layers that dip up-glacier, similar to the thrust structures in the compression zone of a valley glacier. The transverse GPR profiles indicate a syncline structure inclined towards the central part of the rock glacier, resembling the transverse foliation of a valley glacier. The stratigraphy of two boreholes shows that the rock glacier consists primarily of bubbly ice with thin debris-rich layers, an internal structure similar to the 'nested spoons' structure common in the interior of valley glaciers. These results indicate that the glacier motion is controlled by shear movement, common in valley glaciers. The geodetic survey confirms that flow velocities decrease towards the lower part of the rock glacier. Such heterogeneous movement causes longitudinal compression and forms thrusts which then create the debris-rich layer by uplifting basal ice and debris. Pushing of the upstream ice against the downstream ice bends the surface layers, forming transverse ridges on the rock glacier surface.
format JOUR
author Fukui, K.
Sone, T.
Strelin, J.A.
Torielli, C.A.
Mori, J.
Fujii, Y.
author_facet Fukui, K.
Sone, T.
Strelin, J.A.
Torielli, C.A.
Mori, J.
Fujii, Y.
author_sort Fukui, K.
title Dynamics and GPR stratigraphy of a polar rock glacier on James Ross Island, Antarctic Peninsula
title_short Dynamics and GPR stratigraphy of a polar rock glacier on James Ross Island, Antarctic Peninsula
title_full Dynamics and GPR stratigraphy of a polar rock glacier on James Ross Island, Antarctic Peninsula
title_fullStr Dynamics and GPR stratigraphy of a polar rock glacier on James Ross Island, Antarctic Peninsula
title_full_unstemmed Dynamics and GPR stratigraphy of a polar rock glacier on James Ross Island, Antarctic Peninsula
title_sort dynamics and gpr stratigraphy of a polar rock glacier on james ross island, antarctic peninsula
url http://hdl.handle.net/20.500.12110/paper_00221430_v54_n186_p445_Fukui
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AT sonet dynamicsandgprstratigraphyofapolarrockglacieronjamesrossislandantarcticpeninsula
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AT toriellica dynamicsandgprstratigraphyofapolarrockglacieronjamesrossislandantarcticpeninsula
AT morij dynamicsandgprstratigraphyofapolarrockglacieronjamesrossislandantarcticpeninsula
AT fujiiy dynamicsandgprstratigraphyofapolarrockglacieronjamesrossislandantarcticpeninsula
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