Morgan, Daniel J; Putkonen, Jaakko; Balco, Greg; Stone, John (2010): (Table 1) Soil density and concentration of 10Beryllium and 26Aluminium in samples from two ash deposits in the McMurdo Dry Valleys [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.817195, Supplement to: Morgan, DJ et al. (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
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Abstract:
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.
Project(s):
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
Event(s):
04-AV-Pit-4 * Latitude: -77.860000 * Longitude: 160.920000 * Elevation: 1300.0 m * Location: McMurdo Dry Valleys, southern Victorica Land, Antarctica * Method/Device: Digging pit (DPIT)
04-LWV-Pit-25 * Latitude: -77.500000 * Longitude: 162.410000 * Elevation: 700.0 m * Location: McMurdo Dry Valleys, southern Victorica Land, Antarctica * Method/Device: Digging pit (DPIT)
Comment:
Data extracted in the frame of a joint ICSTI/PANGAEA IPY effort, see http://doi.pangaea.de/10.1594/PANGAEA.150150
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Description | Description | Morgan, Daniel J | |||
| 2 | Sample ID | Sample ID | Morgan, Daniel J | |||
| 3 | Depth, top/min | Depth top | m | Morgan, Daniel J | ||
| 4 | Depth, bottom/max | Depth bot | m | Morgan, Daniel J | ||
| 5 | DEPTH, sediment/rock | Depth sed | m | Geocode | ||
| 6 | Density, wet bulk | WBD | g/cm3 | Morgan, Daniel J | of soil | |
| 7 | Cumulative mass | Cum mass | g/cm2 | Morgan, Daniel J | effective shielding mass | |
| 8 | Beryllium-10 | 10Be | 109 atoms/g | Morgan, Daniel J | quartz | |
| 9 | Beryllium-10, standard deviation | 10Be std dev | ± | Morgan, Daniel J | ||
| 10 | Aluminium-26 | 26Al | 106 atoms/g | Morgan, Daniel J | quartz | |
| 11 | Aluminium-26, standard deviation | 26Al std dev | ± | Morgan, Daniel J |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
114 data points