Abstract:
Pumice and lithic clasts from gravel-mantled megaripples in the Argentinean Puna, an analog to Martian large ripples and Transverse Aeolian Ridges (TARs), were put in a boundary layer wind tunnel to derive threshold speeds for various stages of motion of the component clasts and observe incipient bedform development. Combined with results from a field meteorological station, it is found that the gravel components can initially only move under gusty conditions, with the impact of saltating pumice and sand lowering threshold. Pumices can saltate without the impact of sand, implying that they are both an impelling force for other pumices and lithics, and are the most likely clast constituent to undergo transport. Accumulation into bedforms in the tunnel occurs when clasts self organize, with larger, more immobile particles holding others in place, a process that is accentuated in the field on local topographic highs of the undulating ignimbrite bedrock surface. In such an arrangement, pumices and especially lithics remain largely stable, with vibration the dominant mode of motion. This results in sand and silt entrapment and growth of the bedform through infiltration and uplift of the gravel. Resulting bedforms are gravel-mantled ripple-like forms cored with fine grained sediment. The Martian aeolian environment is similar to the Puna in terms of having grains of variable size, infrequent wind gusts, and saltating sand, implying that some TARs on the planet may have formed in a similar way. © 2015 Elsevier B.V.
Registro:
| Documento: |
Artículo
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| Título: | Formation of gravel-mantled megaripples on Earth and Mars: Insights from the Argentinean Puna and wind tunnel experiments |
| Autor: | Bridges, N.T.; Spagnuolo, M.G.; de Silva, S.L.; Zimbelman, J.R.; Neely, E.M. |
| Filiación: | Johns Hopkins University Applied Physics Laboratory, Laurel, MD 20723, United States
Oregon State Univ., Corvallis, OR 97331, United States
CEPS/NASM, Smithsonian Institution, Washington, DC 20013-7012, United States
Department of Geology, Portland State University, Portland, OR 97201, United States
IDEAN, UBA-CONICET Ciudad de Bs, As, Argentina
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| Palabras clave: | Mars; Megaripples; Puna; Ripples; Threshold; Wind tunnel; eolian deposit; eolian process; fine grained sediment; gravel; Mars; ripple; threshold; wind tunnel; Argentina; Puna |
| Año: | 2015
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| Volumen: | 17
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| Página de inicio: | 49
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| Página de fin: | 60
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| DOI: |
http://dx.doi.org/10.1016/j.aeolia.2015.01.007 |
| Título revista: | Aeolian Research
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| Título revista abreviado: | Aeolian Res.
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| ISSN: | 18759637
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| Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_18759637_v17_n_p49_Bridges |
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Citas:
---------- APA ----------
Bridges, N.T., Spagnuolo, M.G., de Silva, S.L., Zimbelman, J.R. & Neely, E.M.
(2015)
. Formation of gravel-mantled megaripples on Earth and Mars: Insights from the Argentinean Puna and wind tunnel experiments. Aeolian Research, 17, 49-60.
http://dx.doi.org/10.1016/j.aeolia.2015.01.007---------- CHICAGO ----------
Bridges, N.T., Spagnuolo, M.G., de Silva, S.L., Zimbelman, J.R., Neely, E.M.
"Formation of gravel-mantled megaripples on Earth and Mars: Insights from the Argentinean Puna and wind tunnel experiments"
. Aeolian Research 17
(2015) : 49-60.
http://dx.doi.org/10.1016/j.aeolia.2015.01.007---------- MLA ----------
Bridges, N.T., Spagnuolo, M.G., de Silva, S.L., Zimbelman, J.R., Neely, E.M.
"Formation of gravel-mantled megaripples on Earth and Mars: Insights from the Argentinean Puna and wind tunnel experiments"
. Aeolian Research, vol. 17, 2015, pp. 49-60.
http://dx.doi.org/10.1016/j.aeolia.2015.01.007---------- VANCOUVER ----------
Bridges, N.T., Spagnuolo, M.G., de Silva, S.L., Zimbelman, J.R., Neely, E.M. Formation of gravel-mantled megaripples on Earth and Mars: Insights from the Argentinean Puna and wind tunnel experiments. Aeolian Res. 2015;17:49-60.
http://dx.doi.org/10.1016/j.aeolia.2015.01.007
