Geophysical studies of permafrost in the dry valleys
Includes bibliographical references. Includes illustrations and maps. Electrical depth sounding, seismic refraction profiling, and laboratory electrical and seismic measurements are used to describe the occurrences and types of permafrost and depth to bedrock in the Dry Valley region, Antarctica. In...
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Northern Illinois University
1973
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ftnorthillinuni:oai:commons.lib.niu.edu:10843/19701 2023-05-15T13:37:34+02:00 Geophysical studies of permafrost in the dry valleys Clark, Clifford Charles McGinnis, Lyle D. (Lyle David), 1931-2017 Department of Geology 1973 xi, 97 pages application/pdf https://commons.lib.niu.edu/handle/10843/19701 eng eng Northern Illinois University https://commons.lib.niu.edu/handle/10843/19701 NIU theses are protected by copyright. They may be viewed from Huskie Commons for any purpose, but reproduction or distribution in any format is prohibited without the written permission of the authors. Frozen ground--Antarctica Text Dissertation/Thesis 1973 ftnorthillinuni 2020-09-22T09:44:04Z Includes bibliographical references. Includes illustrations and maps. Electrical depth sounding, seismic refraction profiling, and laboratory electrical and seismic measurements are used to describe the occurrences and types of permafrost and depth to bedrock in the Dry Valley region, Antarctica. In topographic depressions, especially near lakes, confining permafrost is thin or absent; whereas, in the uplands and on moraines it may be thick (>1,000 m). Areas where confining permafrost is thin or absent are: Don Juan Pond, Don Quixote Pond, Lake Bonney area, Lake Vanda area, Walcott Glacier, and near Lake Fryxell. Areas where it is thick are: Lake Vida, Lake Miers, and the shore of New Harbor. Laboratory measurements indicate resistivities of saturated rocks, soils, and saline solutions increase exponentially with decreasing temperature ( T ) according to an equation of the form = a e b/T. Discontinuities in the - T curve appear to be caused by a final liquid to crystalline phase transition experienced by the contained fluid. The shape of the - T curve is a function of the crossectional area of unfrozen water lying between the matrix grains and ice crystals. The unfrozen water forms a network through which current may flow until extremely low temperatures are reached. Abnormally high compressional wave velocities for ice (4,293 meters per second) were recorded on Lake Vida. Laboratory measurements on prepared ice-sand mixtures yielded velocities up to 4,567 meters per second, suggesting that the high velocity was due to the lake ice containing close to 30 percent sand and gravel. The velocity of a saturated, low-porosity rock decreases with decreasing temperature, whereas the velocity of a porous, fractured rock appears to increase with decreasing temperature. M.S. (Master of Science) Thesis Antarc* Antarctica Ice permafrost Northern Illinois University (NIU): Huskie Commons Repository Miers ENVELOPE(163.850,163.850,-78.100,-78.100) Vanda ENVELOPE(161.550,161.550,-77.533,-77.533) Bonney ENVELOPE(162.417,162.417,-77.717,-77.717) Fryxell ENVELOPE(163.183,163.183,-77.617,-77.617) Lake Bonney ENVELOPE(-25.588,-25.588,-80.361,-80.361) Lake Fryxell ENVELOPE(163.183,163.183,-77.617,-77.617) Lake Vanda ENVELOPE(161.600,161.600,-77.517,-77.517) Walcott ENVELOPE(-63.317,-63.317,-69.083,-69.083) Don Juan Pond ENVELOPE(161.183,161.183,-77.567,-77.567) Lake Vida ENVELOPE(161.950,161.950,-77.383,-77.383) Pond Lake ENVELOPE(-126.692,-126.692,56.046,56.046) New Harbor ENVELOPE(163.850,163.850,-77.600,-77.600) Lake Miers ENVELOPE(-60.450,-60.450,-62.717,-62.717) Don Quixote Pond ENVELOPE(161.150,161.150,-77.533,-77.533) Vida Lake ENVELOPE(161.950,161.950,-77.383,-77.383) Walcott Glacier ENVELOPE(163.250,163.250,-78.233,-78.233) |
institution |
Open Polar |
collection |
Northern Illinois University (NIU): Huskie Commons Repository |
op_collection_id |
ftnorthillinuni |
language |
English |
topic |
Frozen ground--Antarctica |
spellingShingle |
Frozen ground--Antarctica Clark, Clifford Charles Geophysical studies of permafrost in the dry valleys |
topic_facet |
Frozen ground--Antarctica |
description |
Includes bibliographical references. Includes illustrations and maps. Electrical depth sounding, seismic refraction profiling, and laboratory electrical and seismic measurements are used to describe the occurrences and types of permafrost and depth to bedrock in the Dry Valley region, Antarctica. In topographic depressions, especially near lakes, confining permafrost is thin or absent; whereas, in the uplands and on moraines it may be thick (>1,000 m). Areas where confining permafrost is thin or absent are: Don Juan Pond, Don Quixote Pond, Lake Bonney area, Lake Vanda area, Walcott Glacier, and near Lake Fryxell. Areas where it is thick are: Lake Vida, Lake Miers, and the shore of New Harbor. Laboratory measurements indicate resistivities of saturated rocks, soils, and saline solutions increase exponentially with decreasing temperature ( T ) according to an equation of the form = a e b/T. Discontinuities in the - T curve appear to be caused by a final liquid to crystalline phase transition experienced by the contained fluid. The shape of the - T curve is a function of the crossectional area of unfrozen water lying between the matrix grains and ice crystals. The unfrozen water forms a network through which current may flow until extremely low temperatures are reached. Abnormally high compressional wave velocities for ice (4,293 meters per second) were recorded on Lake Vida. Laboratory measurements on prepared ice-sand mixtures yielded velocities up to 4,567 meters per second, suggesting that the high velocity was due to the lake ice containing close to 30 percent sand and gravel. The velocity of a saturated, low-porosity rock decreases with decreasing temperature, whereas the velocity of a porous, fractured rock appears to increase with decreasing temperature. M.S. (Master of Science) |
author2 |
McGinnis, Lyle D. (Lyle David), 1931-2017 Department of Geology |
format |
Thesis |
author |
Clark, Clifford Charles |
author_facet |
Clark, Clifford Charles |
author_sort |
Clark, Clifford Charles |
title |
Geophysical studies of permafrost in the dry valleys |
title_short |
Geophysical studies of permafrost in the dry valleys |
title_full |
Geophysical studies of permafrost in the dry valleys |
title_fullStr |
Geophysical studies of permafrost in the dry valleys |
title_full_unstemmed |
Geophysical studies of permafrost in the dry valleys |
title_sort |
geophysical studies of permafrost in the dry valleys |
publisher |
Northern Illinois University |
publishDate |
1973 |
url |
https://commons.lib.niu.edu/handle/10843/19701 |
long_lat |
ENVELOPE(163.850,163.850,-78.100,-78.100) ENVELOPE(161.550,161.550,-77.533,-77.533) ENVELOPE(162.417,162.417,-77.717,-77.717) ENVELOPE(163.183,163.183,-77.617,-77.617) ENVELOPE(-25.588,-25.588,-80.361,-80.361) ENVELOPE(163.183,163.183,-77.617,-77.617) ENVELOPE(161.600,161.600,-77.517,-77.517) ENVELOPE(-63.317,-63.317,-69.083,-69.083) ENVELOPE(161.183,161.183,-77.567,-77.567) ENVELOPE(161.950,161.950,-77.383,-77.383) ENVELOPE(-126.692,-126.692,56.046,56.046) ENVELOPE(163.850,163.850,-77.600,-77.600) ENVELOPE(-60.450,-60.450,-62.717,-62.717) ENVELOPE(161.150,161.150,-77.533,-77.533) ENVELOPE(161.950,161.950,-77.383,-77.383) ENVELOPE(163.250,163.250,-78.233,-78.233) |
geographic |
Miers Vanda Bonney Fryxell Lake Bonney Lake Fryxell Lake Vanda Walcott Don Juan Pond Lake Vida Pond Lake New Harbor Lake Miers Don Quixote Pond Vida Lake Walcott Glacier |
geographic_facet |
Miers Vanda Bonney Fryxell Lake Bonney Lake Fryxell Lake Vanda Walcott Don Juan Pond Lake Vida Pond Lake New Harbor Lake Miers Don Quixote Pond Vida Lake Walcott Glacier |
genre |
Antarc* Antarctica Ice permafrost |
genre_facet |
Antarc* Antarctica Ice permafrost |
op_relation |
https://commons.lib.niu.edu/handle/10843/19701 |
op_rights |
NIU theses are protected by copyright. They may be viewed from Huskie Commons for any purpose, but reproduction or distribution in any format is prohibited without the written permission of the authors. |
_version_ |
1766094298095288320 |