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History
Glaciers on Mars
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Glaciers, loosely defined as patches of currently or recently flowing ice, are thought to be present across large but restricted areas of the modern Martian surface, and are inferred to have been more widely distributed at times in the past. Lobate convex features on the surface known as viscous flow features and lobate debris aprons, which show the characteristics of non-Newtonian flow, are now almost unanimously regarded as true glaciers.
Martian glacier moving down a valley, as seen by HiRISE under HiWish program.
Martian glacier moving down a valley, as seen by HiRISE under HiWish program.
Lineated valley fill in Ismenius Lacus quadrangle, as seen by HiRISE under HiWish program.
Lineated valley fill in Ismenius Lacus quadrangle, as seen by HiRISE under HiWish program.
Close view of Lineated valley fill in Ismenius Lacus quadrangle, as seen by HiRISE under HiWish program
Close view of Lineated valley fill in Ismenius Lacus quadrangle, as seen by HiRISE under HiWish program
Close, color view of Lineated valley fill in Ismenius Lacus quadrangle, as seen by HiRISE under HiWish program
Close, color view of Lineated valley fill in Ismenius Lacus quadrangle, as seen by HiRISE under HiWish program
Lobate debris apron
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Lobate debris aprons (LDAs) are geological features on Mars, first seen by the Viking Orbiters, consisting of piles of rock debris below cliffs. These features have a convex topography and a gentle slope from cliffs or escarpments, which suggest flow away from the steep source cliff. In addition, lobate debris aprons can show surface lineations as do rock glaciers on the Earth.
Close-up of lobate debris apron (LDA), as seen by HiRISE under HiWish program
Close-up of lobate debris apron (LDA), as seen by HiRISE under HiWish program
Lobate debris apron in Phlegra Montes, as seen by HiRISE. The debris apron is probably mostly ice with a thin covering of rock debris, so it could be
Lobate debris apron in Phlegra Montes, as seen by HiRISE. The debris apron is probably mostly ice with a thin covering of rock debris, so it could be a useful source of water. Scale bar is 500 meters (1,600 feet) long.
View of a lobate debris apron along a slope in Arcadia quadrangle.
View of a lobate debris apron along a slope in Arcadia quadrangle.
Place where a lobate debris apron begins. Note stripes which indicate movement. Image located in Ismenius Lacus quadrangle.
Place where a lobate debris apron begins. Note stripes which indicate movement. Image located in Ismenius Lacus quadrangle.