Skip to Main Content
Book Chapter

Laboratory simulations

Published:
January 01, 2019

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.

Supplementary material: Video clips depicting sediment transport types are available at https://doi.org/10.6084/m9.figshare.5208847

You do not currently have access to this article.

Figures & Tables

Contents

Martian Gullies and their Earth Analogues
CONTAINS OPEN ACCESS

S. J. Conway
S. J. Conway
Centre National de la Recherche Scientifique, France
Search for other works by this author on:
J. L. Carrivick
J. L. Carrivick
University of Leeds, UK
Search for other works by this author on:
P. A. Carling
P. A. Carling
University of Southampton, UK
Search for other works by this author on:
T. de Haas
T. de Haas
University of Utrecht, The Netherlands
Search for other works by this author on:
T.N. Harrison
T.N. Harrison
Arizona State University, USA
Search for other works by this author on:
Geological Society of London
Volume
467
ISBN electronic:
9781786203625
Publication date:
January 01, 2019

GeoRef

References

Related

Citing Books via

Close Modal
This Feature Is Available To Subscribers Only

Sign In or Create an Account

Close Modal
Close Modal