Cold climate landforms on Mars

Autori

• Stephan van Gasselt

Parametri

• Libri di testo
• Libri di testo universitari

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This work explores the landforms and processes associated with cold-climate (periglacial) and hyperarid environments on Mars, drawing parallels with terrestrial research. It focuses on features linked to ice and debris movement at the Martian dichotomy escarpment and southern impact basins, particularly Hellas Planitia, which have sparked debate over their glacial or periglacial classification. Another significant aspect is the study of thermal contraction polygons resulting from seasonal freeze-thaw cycles, particularly in the northern Utopia Planitia and the southern polar cap. The research employs observational and geomorphometrical analyses using imaging-sensor and topographic data to investigate the history, development, and current state of Martian cold-climate landforms. New insights into the age, composition, and deformational history of lobate debris aprons are provided. The study reveals that the processes leading to debris and ice creep at the dichotomy boundary are transitional and not easily defined by conventional terrestrial standards. These processes are linked to the thermokarstic disintegration of permafrost-rich terrain and recent mantling deposits, influenced by cyclic climatic changes in Mars' history. Observations indicate recent disintegration processes across both hemispheres, suggesting modifications that may have led to rock-glacier formation. Age determinations indicate that the latest activity phase

Lingua: Inglese

Pubblicato: 2007