Cited by 18Aeolian processes and effectsGeological formations and processesPlanetary Science and Exploration

Eolianite Grain Size Distributions as a Proxy for Large Changes in Planetary Atmospheric Density

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Goosmann, Erik A., Catling, David C., Som, Sanjoy M., Altermann, Wladyslaw, Buick, Roger·2018·Journal of Geophysical Research: Planets

Abstract

Atmospheres are dynamic over geologic timescales, making large changes in planetary air density possible. For the Earth, geological proxies suggest that air density in the Neoarchean was similar to or lower than today. This air density variation possibly affected eolian dune grain sizes by controlling the trajectories of grains though the air. Balancing the fall velocity and threshold friction velocity, a metric separating saltation and suspension transport, suggests that a lower air density could increase the mean grain size of dunes because decreased air drag extends the size range of grains in modified saltation and incipient suspension regimes. Consequently, the dune‐forming sand left behind in pure saltation, the dominant dune‐forming transport mode, could have coarser grains. We analyzed size distributions of two eolianites from 2.64 and 1.5 Ga (billion years ago) for deviations from modern sand dunes emplaced at sea level, which globally exhibit similar mean grain sizes. Both aeolianites have mean grain sizes within one standard deviation of the modern mean and are not statistically separable at 95% confidence. Overall, this suggests that while air density is important in eolian physics, a factor of 2 to 4 change in density is insufficient to produce an unambiguous grain size signal. This suggests that while eolian dune grain sizes have not significantly changed over the range of Earth's atmospheric conditions, they could be useful when investigating the order of magnitude changes thought to have occurred on Mars.

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  1. Ahlbrandt, T. S. (1979). Textural parameters of eolian deposits. In A study of global sand seas, edited, United States Geological Survey Professional Paper, (pp. 21-51). Washington, D.C: U.S. Government Printing Office.
  2. Eriksson, P., Altermann, W., & Hartzer, F. (2006). The Transvaal Supergroup and its precursors, (pp. 237-260). Pretoria: The Geology of South Africa.
  3. Purkait, B., Majumdar, D. D., & Paul, A. K. (2015). Grain sorting on a coastal dune of Orissa, bay of Bengal and a comparison with the desert dune of Rajasthan, India. International Research Journal of Earth Sciences, 3(8), 14-31.
  4. Wiegand, J. P. (1977). Dune morphology and sedimentology at Great Sand Dunes National Monument, 165 pp., MS Thesis, Colorado State University.

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Authors
Goosmann, E. A., Catling, D. C., Som, S. M., Altermann, W., & Buick, R.
Affiliations
  • University of Washington (US)
  • Blue Marble Space Institute of Science (US)
  • University of Pretoria (ZA)
Corresponding author
Goosmann, Erik A.
Venue
Journal of Geophysical Research: Planets
Published
2018-10
Volume
123
Issue
10
Pages
2506-2526
ISSN
  • 2169-9097 (ISSN-L)
  • 2169-9100
OpenAlex
W2891609853
Cited by
18
References
79
Citations by year
2026: 2 · 2025: 2 · 2024: 3 · 2023: 2 · 2022: 1 · 2021: 1 · 2020: 6 · 2019: 1
FWCI
1.84
Type
journal article
Language
en
Open access
Locations
  • Journal of Geophysical Research Planets (publishedVersion)
  • UpSpace Institutional Repository (University of Pretoria) (submittedVersion)
Funders
  • NASA Astrobiology Institute (NNA13AA93A)
  • Simons Foundation (511570)
  • National Aeronautics and Space Administration (NNA13AA93A)
Topics
  • Physical Sciences › Earth and Planetary Sciences › Earth-Surface Processes › Aeolian processes and effects
  • Physical Sciences › Earth and Planetary Sciences › Earth-Surface Processes › Geological formations and processes
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Planetary Science and Exploration
Keywords
eolianites, grain size distribution, air density, paleoatmosphere, saltation, suspension transport, aeolian dunes, settling velocity, friction velocity, Neoarchean, early Earth atmosphere, Mars atmosphere, aeolian sand transport

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