Possible climate-related signals in high-resolution topography of lobate debris aprons in Tempe Terra, Mars
نویسندگان
چکیده
منابع مشابه
Radar evidence for ice in lobate debris aprons in the mid-northern latitudes of Mars
[1] Subsurface radar sounding data indicate that lobate debris aprons found in Deuteronilus Mensae in the midnorthern latitudes of Mars are composed predominantly of water ice. The position in time delay and the relatively low amount of signal loss of the apparent basal reflectors below the debris aprons indicate that aprons contain only a minor component of lithic material. The current presenc...
متن کاملModeling the Formation of Lobate Debris Aprons on Mars by Creep of Ice-rich Permafrost
Introduction: A wide variety of midto highlatitude surface features on Mars has long been attributed to viscous creep and flow phenomena associated with near-surface ground ice. On the basis of Viking Orbiter images, Squyres [1] identified two classes of creep-related landforms: (1) softened terrain, which results from in situ viscous deformation and is particularly evident in impact craters wi...
متن کاملOrigin of martian northern hemisphere mid-latitude lobate debris aprons
Lobate debris aprons in the martian midto high-latitudes (northern and southern hemispheres) have been interpreted as ice-related features that indicate periglacial climate conditions as recently as late Amazonian. Using MOLA topographic profiles perpendicular to apron flow fronts, we surveyed 36 debris aprons in the northern hemisphere found in the regions of Mareotis, Protonilus, and Deuteron...
متن کاملFormation of lobate debris aprons on Mars: Assessment of regional ice sheet collapse and debris-cover armoring
Lobate debris aprons (LDA) are lobate-shaped aprons surrounding scarps and isolated massifs that are concentrated in the vicinity of the northern Dichotomy Boundary on Mars. LDAs have been interpreted as (1) ice-cemented talus aprons undergoing viscous flow, (2) local debris-covered alpine-like glaciers, or (3) remnants of the collapse of a regional retreating ice sheet. We investigate the plau...
متن کاملLineated Valley Fill and Lobate Debris Aprons in the Deuteronilus Mensae Region, Mars: Implications for Regional Glaciation
Introduction: Mamers Valles is a fretted valley along the dichotomy boundary in the Deuteronilus Men-sae region of Mars (Fig. 1). Analyses of Mamers Valles from Viking images [1-2] characterized it as a fretted channel filled with textured terrain. The channel is interpreted to have formed in the Early Hesperian or earlier [3-4], however, the terrain filling the valley is recent, as young as La...
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ژورنال
عنوان ژورنال: Geophysical Research Letters
سال: 2011
ISSN: 0094-8276
DOI: 10.1029/2011gl049295