Actions
  • shareshare
  • link
  • cite
  • add
add
Publication . Part of book or chapter of book . 2019

CO2 sublimation in Martian gullies: laboratory experiments at varied slope angle and regolith grain sizes

Sylvest, Matthew E.; Dixon, John C.; Conway, Susan J.; Patel, Manish R.; McElwaine, Jim N.; Hagermann, Axel; Barnes, Adam;
Open Access
English
Published: 01 Jan 2019
Publisher: The Geological Society of London
Abstract
Martian gullies were initially hypothesized to be carved by liquid water, due to their resemblance to gullies on Earth. Recent observations have highlighted significant sediment transport events occurring in Martian gullies at times and places where CO2 ice should be actively sublimating. Here we explore the role of CO2 sublimation in mobilizing sediment through laboratory simulation. In our previous experimental work, we reported the first observations of sediment slope movement triggered by the sublimation of CO2 frost. We used a Mars regolith simulant near the angle of repose. The current study extends our previous work by including two additional substrates, fine and coarse sand, and by testing slope angles down to 10°. We find that the Mars regolith simulant is active down to 17°, the fine sand is active only near the angle of repose and the coarse sand shows negligible movement. Using an analytical model, we show that under Martian gravity motion should be possible at even lower slope angles. We conclude that these mass-wasting processes could be involved in shaping Martian gullies at the present day and intriguingly the newly reported CO2-creep process could provide an alternative explanation for putative solifluction lobes on Mars.
64 references, page 1 of 7

ALLEN, C.C., MORRIS, R.V., KAREN, M.J., GOLDEN, D.C., LINDSTROM, M.M. & LOCKWOOD, J.P. 1998. Martian Regolith Simulant JSC Mars-1. Lunar and Planetary Science Conference XXVIII, 1690.

APPÉRÉ, T., SCHMITT, B. ET AL. 2011. Winter and spring evolution of northern seasonal deposits on Mars from OMEGA on Mars Express. Journal of Geophysical Research E Planets, 116, https://doi.org/10.1029/ 2010JE003762

AULD, K.S. & DIXON, J.C. 2016. A classification of Martian gullies from HiRISE imagery. Planetary and Space Science, 131, 88-101, https://doi.org/10.1016/j.pss. 2016.08.002

BALME, M.R., GALLAGHER, C.J. & HAUBER, E. 2013. Morphological evidence for geologically young thaw of ice on Mars: a review of recent studies using highresolution imaging data. Progress in Physical Geography, 37, 289-324, https://doi.org/10.1177/030913 3313477123

BARGERY, A.S., BALME, M.R., WARNER, N., GALLAGHER, C.J. & GUPTA, S. 2011. A background to Mars exploration and research. In: BALME, M.R., BARGERY, A.S., GALLAGHER, C.J. & GUPTA, S. (eds) Martian Geomorphology. Geological Society, London, Special Publications, 356, 5-20, https://doi.org/10. 1144/SP356.2

CEDILLO-FLORES, Y., TREIMAN, A.H., LASUE, J. & CLIFFORD, S.M. 2011. CO2 gas fluidization in the initiation and formation of Martian polar gullies. Geophysical Research Letters, 38, https://doi.org/10.1029/2011 GL049403

CHRISTENSEN, P.R. 1986. Regional dust deposits on Mars: physical properties, age, and history. Journal of Geophysical Research, 91, 3533-3545, https://doi.org/ 10.1029/JB091iB03p03533

COLEMAN, K.A., DIXON, J.C., HOWE, K.L., ROE, L.A. & CHEVRIER, V. 2009. Experimental simulation of Martian gully forms. Planetary and Space Science, 57, 711-716, https://doi.org/10.1016/j.pss.2008.11.002

CONWAY, S.J., LAMB, M.P., BALME, M.R., TOWNER, M.C. & MURRAY, J.B. 2011a. Enhanced runout and erosion by overland flow at low pressure and sub-freezing conditions: experiments and application to Mars. Icarus, 211, 443-457, https://doi.org/10.1016/j.icarus.2010. 08.026

CONWAY, S.J., BALME, M.R., MURRAY, J.B., TOWNER, M.C., OKUBO, C.H. & GRINDROD, P.M. 2011b. The indication of Martian gully formation processes by slope-area analysis. In: BALME, M.R., BARGERY, A.S., GALLAGHER, C.J. & GUPTA, S. (eds) Martian Geomorphology. Geological Society, London, Special Publications, 356, 171-201, https://doi.org/10.1144/SP356.10

Funded by
EC| EPN2020-RI
Project
EPN2020-RI
EUROPLANET 2020 Research Infrastructure
  • Funder: European Commission (EC)
  • Project Code: 654208
  • Funding stream: H2020 | RIA
,
EC| UPWARDS
Project
UPWARDS
Understanding Planet Mars With Advanced Remote-sensing Datasets and Synergistic Studies
  • Funder: European Commission (EC)
  • Project Code: 633127
  • Funding stream: H2020 | RIA
Download from
lock_open
moresidebar