(Table 3) Age-related trends of desert pavement properties in the Transantarctic Mountains
Compared to mid-latitude deserts, the properties, formation and evolution of desert pavements and the underlying vesicular layer in Antarctica are poorly understood. This study examines the desert pavements and the vesicular layer from seven soil chronosequences in the Transantarctic Mountains that...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.807589 2023-05-15T13:49:51+02:00 (Table 3) Age-related trends of desert pavement properties in the Transantarctic Mountains Bockheim, James G MEDIAN LATITUDE: -79.085000 * MEDIAN LONGITUDE: 162.468667 * SOUTH-BOUND LATITUDE: -83.750000 * WEST-BOUND LONGITUDE: 157.583000 * NORTH-BOUND LATITUDE: -77.496000 * EAST-BOUND LONGITUDE: 171.000000 * MINIMUM ELEVATION: 1325.0 m * MAXIMUM ELEVATION: 1325.0 m 2010-02-19 text/tab-separated-values, 639 data points https://doi.pangaea.de/10.1594/PANGAEA.807589 https://doi.org/10.1594/PANGAEA.807589 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.807589 https://doi.org/10.1594/PANGAEA.807589 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Bockheim, James G (2010): Evolution of desert pavements and the vesicular layer in soils of the Transantarctic Mountains. Geomorphology, 118(3-4), 433-443, https://doi.org/10.1016/j.geomorph.2010.02.012 Area/locality Arena_valley Beacon_Valley Beardmore_glacier Boulder Cobble Crystal size Depth relative Description Desert pavement density Epoch Event label HAND Hatherton_glacier Index International Polar Year (2007-2008) IPY Latitude of event Layer thickness Longitude of event Macropitting Parameter Pebble Ratio Ross Sea Region Antarctica Sampling by hand Taylor_valley Transantarctic Mountains Varnish Ventifacts WrightValley Dataset 2010 ftpangaea https://doi.org/10.1594/PANGAEA.807589 https://doi.org/10.1016/j.geomorph.2010.02.012 2023-01-20T09:00:35Z Compared to mid-latitude deserts, the properties, formation and evolution of desert pavements and the underlying vesicular layer in Antarctica are poorly understood. This study examines the desert pavements and the vesicular layer from seven soil chronosequences in the Transantarctic Mountains that have developed on two contrasting parent materials: sandstone-dolerite and granite-gneiss. The pavement density commonly ranges from 63 to 92% with a median value of 80% and does not vary significantly with time of exposure or parent material composition. The dominant size range of clasts decreases with time of exposure, ranging from 16-64 mm on Holocene and late Quaternary surfaces to 8-16 mm on surfaces of middle Quaternary and older age. The proportion of clasts with ventifaction increases progressively through time from 20% on drifts of Holocene and late Quaternary age to 35% on Miocene-aged drifts. Desert varnish forms rapidly, especially on dolerite clasts, with nearly 100% cover on surfaces of early Quaternary and older age. Macropitting occurs only on clasts that have been exposed since the Miocene. A pavement development index, based on predominant clast-size class, pavement density, and the proportion of clasts with ventifaction, varnish, and pits, readily differentiated pavements according to relative age. From these findings we judge that desert pavements initially form from a surficial concentration of boulders during till deposition followed by a short period of deflation and a longer period of progressive chemical and physical weathering of surface clasts. The vesicular layer that underlies the desert pavement averages 4 cm in thickness and is enriched in silt, which is contributed primarily by weathering rather than eolian deposition. A comparison is made between desert pavement properties in mid-latitude deserts and Antarctic deserts. Dataset Antarc* Antarctic Antarctica International Polar Year IPY Ross Sea PANGAEA - Data Publisher for Earth & Environmental Science Antarctic Ross Sea Transantarctic Mountains ENVELOPE(157.583000,171.000000,-77.496000,-83.750000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
Area/locality Arena_valley Beacon_Valley Beardmore_glacier Boulder Cobble Crystal size Depth relative Description Desert pavement density Epoch Event label HAND Hatherton_glacier Index International Polar Year (2007-2008) IPY Latitude of event Layer thickness Longitude of event Macropitting Parameter Pebble Ratio Ross Sea Region Antarctica Sampling by hand Taylor_valley Transantarctic Mountains Varnish Ventifacts WrightValley |
spellingShingle |
Area/locality Arena_valley Beacon_Valley Beardmore_glacier Boulder Cobble Crystal size Depth relative Description Desert pavement density Epoch Event label HAND Hatherton_glacier Index International Polar Year (2007-2008) IPY Latitude of event Layer thickness Longitude of event Macropitting Parameter Pebble Ratio Ross Sea Region Antarctica Sampling by hand Taylor_valley Transantarctic Mountains Varnish Ventifacts WrightValley Bockheim, James G (Table 3) Age-related trends of desert pavement properties in the Transantarctic Mountains |
topic_facet |
Area/locality Arena_valley Beacon_Valley Beardmore_glacier Boulder Cobble Crystal size Depth relative Description Desert pavement density Epoch Event label HAND Hatherton_glacier Index International Polar Year (2007-2008) IPY Latitude of event Layer thickness Longitude of event Macropitting Parameter Pebble Ratio Ross Sea Region Antarctica Sampling by hand Taylor_valley Transantarctic Mountains Varnish Ventifacts WrightValley |
description |
Compared to mid-latitude deserts, the properties, formation and evolution of desert pavements and the underlying vesicular layer in Antarctica are poorly understood. This study examines the desert pavements and the vesicular layer from seven soil chronosequences in the Transantarctic Mountains that have developed on two contrasting parent materials: sandstone-dolerite and granite-gneiss. The pavement density commonly ranges from 63 to 92% with a median value of 80% and does not vary significantly with time of exposure or parent material composition. The dominant size range of clasts decreases with time of exposure, ranging from 16-64 mm on Holocene and late Quaternary surfaces to 8-16 mm on surfaces of middle Quaternary and older age. The proportion of clasts with ventifaction increases progressively through time from 20% on drifts of Holocene and late Quaternary age to 35% on Miocene-aged drifts. Desert varnish forms rapidly, especially on dolerite clasts, with nearly 100% cover on surfaces of early Quaternary and older age. Macropitting occurs only on clasts that have been exposed since the Miocene. A pavement development index, based on predominant clast-size class, pavement density, and the proportion of clasts with ventifaction, varnish, and pits, readily differentiated pavements according to relative age. From these findings we judge that desert pavements initially form from a surficial concentration of boulders during till deposition followed by a short period of deflation and a longer period of progressive chemical and physical weathering of surface clasts. The vesicular layer that underlies the desert pavement averages 4 cm in thickness and is enriched in silt, which is contributed primarily by weathering rather than eolian deposition. A comparison is made between desert pavement properties in mid-latitude deserts and Antarctic deserts. |
format |
Dataset |
author |
Bockheim, James G |
author_facet |
Bockheim, James G |
author_sort |
Bockheim, James G |
title |
(Table 3) Age-related trends of desert pavement properties in the Transantarctic Mountains |
title_short |
(Table 3) Age-related trends of desert pavement properties in the Transantarctic Mountains |
title_full |
(Table 3) Age-related trends of desert pavement properties in the Transantarctic Mountains |
title_fullStr |
(Table 3) Age-related trends of desert pavement properties in the Transantarctic Mountains |
title_full_unstemmed |
(Table 3) Age-related trends of desert pavement properties in the Transantarctic Mountains |
title_sort |
(table 3) age-related trends of desert pavement properties in the transantarctic mountains |
publisher |
PANGAEA |
publishDate |
2010 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.807589 https://doi.org/10.1594/PANGAEA.807589 |
op_coverage |
MEDIAN LATITUDE: -79.085000 * MEDIAN LONGITUDE: 162.468667 * SOUTH-BOUND LATITUDE: -83.750000 * WEST-BOUND LONGITUDE: 157.583000 * NORTH-BOUND LATITUDE: -77.496000 * EAST-BOUND LONGITUDE: 171.000000 * MINIMUM ELEVATION: 1325.0 m * MAXIMUM ELEVATION: 1325.0 m |
long_lat |
ENVELOPE(157.583000,171.000000,-77.496000,-83.750000) |
geographic |
Antarctic Ross Sea Transantarctic Mountains |
geographic_facet |
Antarctic Ross Sea Transantarctic Mountains |
genre |
Antarc* Antarctic Antarctica International Polar Year IPY Ross Sea |
genre_facet |
Antarc* Antarctic Antarctica International Polar Year IPY Ross Sea |
op_source |
Supplement to: Bockheim, James G (2010): Evolution of desert pavements and the vesicular layer in soils of the Transantarctic Mountains. Geomorphology, 118(3-4), 433-443, https://doi.org/10.1016/j.geomorph.2010.02.012 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.807589 https://doi.org/10.1594/PANGAEA.807589 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.807589 https://doi.org/10.1016/j.geomorph.2010.02.012 |
_version_ |
1766252375249518592 |