(Table 1) Soil density and concentration of 10Beryllium and 26Aluminium in samples from two ash deposits in the McMurdo Dry Valleys
The McMurdo Dry Valleys, Antarctica (MDV) are among the oldest landscapes on Earth, and some landforms there present an intriguing apparent contradiction such that millions of years old surface deposits maintain their meter-scale morphology despite the fact that measured erosion rates are 0.1-4 m/Ma...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.817195 2023-05-15T13:49:51+02:00 (Table 1) Soil density and concentration of 10Beryllium and 26Aluminium in samples from two ash deposits in the McMurdo Dry Valleys Morgan, Daniel J Putkonen, Jaakko Balco, Greg Stone, John MEDIAN LATITUDE: -77.680000 * MEDIAN LONGITUDE: 161.665000 * SOUTH-BOUND LATITUDE: -77.860000 * WEST-BOUND LONGITUDE: 160.920000 * NORTH-BOUND LATITUDE: -77.500000 * EAST-BOUND LONGITUDE: 162.410000 * MINIMUM DEPTH, sediment/rock: 0.005 m * MAXIMUM DEPTH, sediment/rock: 0.785 m 2010-07-25 text/tab-separated-values, 114 data points https://doi.pangaea.de/10.1594/PANGAEA.817195 https://doi.org/10.1594/PANGAEA.817195 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.817195 https://doi.org/10.1594/PANGAEA.817195 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Morgan, Daniel J; Putkonen, Jaakko; Balco, Greg; Stone, John (2010): Quantifying regolith erosion rates with cosmogenic nuclides 10Be and 26Al in the McMurdo Dry Valleys, Antarctica. Journal of Geophysical Research, 115(F3), F03037, https://doi.org/10.1029/2009JF001443 04-AV-Pit-4 04-LWV-Pit-25 Aluminium-26 standard deviation Beryllium-10 Cumulative mass Density wet bulk Depth bottom/max sediment/rock top/min Description Digging pit DPIT International Polar Year (2007-2008) IPY McMurdo Dry Valleys southern Victorica Land Antarctica Sample ID Dataset 2010 ftpangaea https://doi.org/10.1594/PANGAEA.817195 https://doi.org/10.1029/2009JF001443 2023-01-20T09:01:23Z The McMurdo Dry Valleys, Antarctica (MDV) are among the oldest landscapes on Earth, and some landforms there present an intriguing apparent contradiction such that millions of years old surface deposits maintain their meter-scale morphology despite the fact that measured erosion rates are 0.1-4 m/Ma. We analyzed the concentration of cosmic ray-produced 10Be and 26Al in quartz sands from regolith directly above and below two well-documented ash deposits in the MDV, the Arena Valley ash (40Ar/39Ar age of 4.33 Ma) and the Hart ash (K-Ar age of 3.9 Ma). Measured concentrations of 10Be and 26Al are significantly less than expected given the age of the in situ air fall ashes and are best interpreted as reflecting the degradation rate of the overlying sediments. The erosion rate of the material above the Arena Valley ash that best explains the observed isotope profiles is 3.5 ± 0.41 x 10**-5 g/cm**2/yr (~0.19 m/Ma) for the past ~4 Ma. For the Hart ash, the erosion rate is 4.8 ± 0.21 x 10**-4 g/cm**2/yr (~2.6 m/Ma) for the past ~1 Ma. The concentration profiles do not show signs of mixing, creep, or deflation caused by sublimation of ground ice. These results indicate that the slow, steady lowering of the surface without vertical mixing may allow landforms to maintain their meter-scale morphology even though they are actively eroding. Dataset Antarc* Antarctica Antarctica Journal International Polar Year IPY McMurdo Dry Valleys PANGAEA - Data Publisher for Earth & Environmental Science Arena Valley ENVELOPE(160.983,160.983,-77.833,-77.833) McMurdo Dry Valleys ENVELOPE(160.920000,162.410000,-77.500000,-77.860000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
04-AV-Pit-4 04-LWV-Pit-25 Aluminium-26 standard deviation Beryllium-10 Cumulative mass Density wet bulk Depth bottom/max sediment/rock top/min Description Digging pit DPIT International Polar Year (2007-2008) IPY McMurdo Dry Valleys southern Victorica Land Antarctica Sample ID |
spellingShingle |
04-AV-Pit-4 04-LWV-Pit-25 Aluminium-26 standard deviation Beryllium-10 Cumulative mass Density wet bulk Depth bottom/max sediment/rock top/min Description Digging pit DPIT International Polar Year (2007-2008) IPY McMurdo Dry Valleys southern Victorica Land Antarctica Sample ID Morgan, Daniel J Putkonen, Jaakko Balco, Greg Stone, John (Table 1) Soil density and concentration of 10Beryllium and 26Aluminium in samples from two ash deposits in the McMurdo Dry Valleys |
topic_facet |
04-AV-Pit-4 04-LWV-Pit-25 Aluminium-26 standard deviation Beryllium-10 Cumulative mass Density wet bulk Depth bottom/max sediment/rock top/min Description Digging pit DPIT International Polar Year (2007-2008) IPY McMurdo Dry Valleys southern Victorica Land Antarctica Sample ID |
description |
The McMurdo Dry Valleys, Antarctica (MDV) are among the oldest landscapes on Earth, and some landforms there present an intriguing apparent contradiction such that millions of years old surface deposits maintain their meter-scale morphology despite the fact that measured erosion rates are 0.1-4 m/Ma. We analyzed the concentration of cosmic ray-produced 10Be and 26Al in quartz sands from regolith directly above and below two well-documented ash deposits in the MDV, the Arena Valley ash (40Ar/39Ar age of 4.33 Ma) and the Hart ash (K-Ar age of 3.9 Ma). Measured concentrations of 10Be and 26Al are significantly less than expected given the age of the in situ air fall ashes and are best interpreted as reflecting the degradation rate of the overlying sediments. The erosion rate of the material above the Arena Valley ash that best explains the observed isotope profiles is 3.5 ± 0.41 x 10**-5 g/cm**2/yr (~0.19 m/Ma) for the past ~4 Ma. For the Hart ash, the erosion rate is 4.8 ± 0.21 x 10**-4 g/cm**2/yr (~2.6 m/Ma) for the past ~1 Ma. The concentration profiles do not show signs of mixing, creep, or deflation caused by sublimation of ground ice. These results indicate that the slow, steady lowering of the surface without vertical mixing may allow landforms to maintain their meter-scale morphology even though they are actively eroding. |
format |
Dataset |
author |
Morgan, Daniel J Putkonen, Jaakko Balco, Greg Stone, John |
author_facet |
Morgan, Daniel J Putkonen, Jaakko Balco, Greg Stone, John |
author_sort |
Morgan, Daniel J |
title |
(Table 1) Soil density and concentration of 10Beryllium and 26Aluminium in samples from two ash deposits in the McMurdo Dry Valleys |
title_short |
(Table 1) Soil density and concentration of 10Beryllium and 26Aluminium in samples from two ash deposits in the McMurdo Dry Valleys |
title_full |
(Table 1) Soil density and concentration of 10Beryllium and 26Aluminium in samples from two ash deposits in the McMurdo Dry Valleys |
title_fullStr |
(Table 1) Soil density and concentration of 10Beryllium and 26Aluminium in samples from two ash deposits in the McMurdo Dry Valleys |
title_full_unstemmed |
(Table 1) Soil density and concentration of 10Beryllium and 26Aluminium in samples from two ash deposits in the McMurdo Dry Valleys |
title_sort |
(table 1) soil density and concentration of 10beryllium and 26aluminium in samples from two ash deposits in the mcmurdo dry valleys |
publisher |
PANGAEA |
publishDate |
2010 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.817195 https://doi.org/10.1594/PANGAEA.817195 |
op_coverage |
MEDIAN LATITUDE: -77.680000 * MEDIAN LONGITUDE: 161.665000 * SOUTH-BOUND LATITUDE: -77.860000 * WEST-BOUND LONGITUDE: 160.920000 * NORTH-BOUND LATITUDE: -77.500000 * EAST-BOUND LONGITUDE: 162.410000 * MINIMUM DEPTH, sediment/rock: 0.005 m * MAXIMUM DEPTH, sediment/rock: 0.785 m |
long_lat |
ENVELOPE(160.983,160.983,-77.833,-77.833) ENVELOPE(160.920000,162.410000,-77.500000,-77.860000) |
geographic |
Arena Valley McMurdo Dry Valleys |
geographic_facet |
Arena Valley McMurdo Dry Valleys |
genre |
Antarc* Antarctica Antarctica Journal International Polar Year IPY McMurdo Dry Valleys |
genre_facet |
Antarc* Antarctica Antarctica Journal International Polar Year IPY McMurdo Dry Valleys |
op_source |
Supplement to: Morgan, Daniel J; Putkonen, Jaakko; Balco, Greg; Stone, John (2010): Quantifying regolith erosion rates with cosmogenic nuclides 10Be and 26Al in the McMurdo Dry Valleys, Antarctica. Journal of Geophysical Research, 115(F3), F03037, https://doi.org/10.1029/2009JF001443 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.817195 https://doi.org/10.1594/PANGAEA.817195 |
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.817195 https://doi.org/10.1029/2009JF001443 |
_version_ |
1766252411528151040 |