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THE ORIGIN OF STRIPE-LIKE PATTERNS ON MARTIAN GULLY SLOPES; USING SVALBARD ADVENT VALLEY AS A MARS ANALOGUE.

Poster (konferens)
Författare Andreas Johnsson
Lars Johansson
Michael Zanetti
Dennis Reiss
Ernst Hauber
Harald Hiesinger
Mathias Ulrich
Mats Olvmo
Ella Carlsson
R. Jaumann
F. Trauthan
F. Preusker
H.A.B. Johansson
Steve McDaniel
Publicerad i 41st Lunar and Planetary Science Conference
Nummer/häfte 1665
Publiceringsår 2010
Publicerad vid Institutionen för geovetenskaper
Språk en
Länkar www.lpi.usra.edu/meetings/lpsc2010/...
Ämnesord Mars, Svalbard, patterned ground, periglacial, permafrost, solifluction
Ämneskategorier Planetsystemet, Geovetenskap och miljövetenskap, Fysisk geografi

Sammanfattning

Stripes are a common slope features in polar regions on Earth were active layer processes (freezing/thawing and gelifluction) occur. Their origin is most likely polygenic and closely related to frost crack plygons and sorted circles with the addition of a gravitational component. Stripes are either sorted or unsorted. Features resembling stripes have been observed on slopes on Mars with or without association with polygons. Due to the current temperature and pressure regime on Mars soil moisture and active layer processes are not likely to occur. However, in recent HiRISE images stripelike patterns can be observed in proximity to gullies . Stripe width typically ranges from ~50 cm to 1.5 m, and their orientation is consistently down slope, although it can not be excluded that it sometimes slightly deviates from the steepest topographic gradient. In our study we have examined sorted and nonsorted stripes on slopes in Svalbard in order to test the working hypothesis of an cryoturbation origin for the martian stripe-like patterns. In doing so we compare their morphological characteristics, settings, and slope to those on Mars.

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