Recent high-latitude icy mantle in the northern plains of Mars: Characteristics and ages of emplacement
Article first published online: 3 JUN 2006
Copyright 2006 by the American Geophysical Union.
Geophysical Research Letters
Volume 33, Issue 11, June 2006
How to Cite
2006), Recent high-latitude icy mantle in the northern plains of Mars: Characteristics and ages of emplacement, Geophys. Res. Lett., 33, L11201, doi:10.1029/2006GL025946., , and (
- Issue published online: 3 JUN 2006
- Article first published online: 3 JUN 2006
- Manuscript Accepted: 2 MAY 2006
- Manuscript Revised: 23 APR 2006
- Manuscript Received: 3 FEB 2006
 Martian high-latitude zones are covered with a smooth, layered ice-rich mantle containing characteristic polygonal patterns. The mantle is especially uniform and homogeneous in the northern plains. We performed a survey of decameter-scale mantle textures and circular features, including impact craters, in the northern lowlands down to 50°N latitude. Strongly altered and mantled craters of impact and non-impact origin form a population of subtle circular features below the mantle. Pits of non-impact origin are numerous in some regions at lower latitudes. Impact craters superposed on the mantle are small and very sparse. The inferred mean crater retention age of the mantle is ∼0.1 Ma. The spatial distribution of young craters suggests an age difference between the highest latitudes (younger) and some lower-latitude regions (older). Latitudinal trends in polygon textures agree with impact crater evidence for a latitudinal age progression of mantle properties.