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Abalos Colles

Close-up of USGS map showing the location of Abalos Colles in Planum Boreum in the vicinity of Rupes Tenuis, showing also Abalos Mensa, Abalos Scopuli, and Tenuis Mensa

Abalos Colles (Latin for "Abalos Hills") is a stratified fragment of the Rupes Tenuis basal unit of Planum Boreum,[1][2] located south of the Rupes Tenuis scarp and west of the Escorial crater.[3][4] It contains 16 mounds.[4] Abalos Colles is one of the named features in the vicinity of Planum Boreum, the Martian North pole. It is named after one of the classical albedo features on Mars located at latitude 72°N, longitude 70°W.[5] Its name was officially approved by the International Astronomical Union (IAU) in 2003.[5]

It extends from latitude 74.81°N to 78.78°N and from longitude 284.54°E to 293.39°E (66.61°W – 75.46°W).[5] Its centre is located at latitude 71.65°N, longitude 76.83°W, and has a diameter of 235.83 km.[5] The Abalos Colles mounds are of irregular, angular, or conical form.[3] The tops of the conical forms can feature craters,[3] and can also be flat.[6] Their height varies between less than a hundred to less than 700 metres, with top diameters in the range of 20 km.[3] The northernmost boundary of the dune field of Abalos Undae is located in the southwest channel that separates Abalos Colles from the main ice cap, and from there the dune field extends southwest all the way to the lowlands of Vastitas Borealis.[2][4][7]

  1. ^ T. KNEISSL; S. VAN GASSELT; L. WENDT; C. GROSS; G. NEUKUM (2011). "Layering and degradation of the Rupes Tenuis unit, Mars – astructural analysis south of Chasma Boreale". Geological Society, London, Special Publications. 356 (1): 257–279. Bibcode:2011GSLSP.356..257K. doi:10.1144/SP356.13.
  2. ^ a b Niels Hovius; Andrew Lea-Cox; Jens M. Turowski (29 May 2008). "Recent volcano–ice interaction and outburst flooding in a Mars polar cap re-entrant". Icarus. 197 (197): 24–38. Bibcode:2008Icar..197...24H. doi:10.1016/j.icarus.2008.04.020.
  3. ^ a b c d Matthew R. Balme (2011). Martian Geomorphology. Geological Society of London. p. 257. ISBN 978-1-86239-330-1.
  4. ^ a b c Kenneth L. Tanaka; J. Alexis P. Rodriguez; James A. Skinner Jr; Mary C. Bourke; Corey M. Fortezzo; Kenneth E. Herkenhoff; Eric J. Kolb; Chris H. Okubo (28 February 2008). "North polar region of Mars: Advances in stratigraphy, structure, and erosional modification". Icarus. 196 (2): 318–358. Bibcode:2008Icar..196..318T. doi:10.1016/j.icarus.2008.01.021. Retrieved 25 August 2017.
  5. ^ a b c d "Abalos Colles". Gazetteer of Planetary Nomenclature. USGS.
  6. ^ Kenneth L. Tanaka and Corey M. Fortezzo. "Geologic Map of the North Polar Region of Mars" (PDF). USGS.
  7. ^ Kate Fishbaugh (19 November 2008). "Dunes in Abalos Undae".
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