Mangala Valles

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Mangala Valles
Mangala Valles based on day THEMIS.png
Mangala Valles and Mangala Fossa
(THEMIS image)
Coordinates 11°36′S 151°00′W / 11.6°S 151.0°W / -11.6; -151.0Coordinates: 11°36′S 151°00′W / 11.6°S 151.0°W / -11.6; -151.0
Length 828.0 km

Mangala Valles is a complex system of criss-crossing channels on Mars, located in the Tharsis region and in the Memnonia quadrangle. It originates in the Hesperian and Amazonian epochs. It is thought to be an outflow channel, carved by catastrophic floods, and the release of vast quantities of water across the Martian surface. This flooding was probably initiated by tectonic stretching and the formation of a graben, Mangala Fossa, at the channels' head, perhaps breaching a pressurized aquifer trapped beneath a thick "cryosphere" (layer of frozen ground) beneath the surface.[1][2][3][4][5][6][7] Mangala Valles contains several basins which filled, then the overflow went through a series of spillways.[8][9] One source of waters for the system was Memonia Fossae, but water also probably came from a large basin centered at 40 degrees S.[10][11]

A recent study that used photogeologic analysis, geomorphic surface mapping, cratering statistics, and relative stratigraphy, demonstrated that Mangala Valles was flooded by water at least twice and covered with lava at least three times during the Late Amazonian. The presence of scoured bedrock at the base of the mapped stratigraphy, together with evidence from crater retention ages, suggests that fluvial activity came before lava flows. These alternating periods of aqueous flooding and volcanism are similar to that of other outflow systems on Mars, such as Kasei Valles [12] and Ravi Vallis[13]

There are many wind-sculpted ridges or yardangs covering many of the surfaces in the Mangala Valles region.[14][15]

"Mangala" is the name for Mars in Jyotish (or Hindu) astrology.

Gallery[edit]

Mangala Valles and Mangala Fossa (USGS maps)
Context
Close-up
Topographic maps (MOLA) – Memnonia region of Mars (left); and a close-up (right) of the location of Mangala Fossa and the source of the Mangala Valles outflow channel.

In fiction[edit]

See also[edit]

References[edit]

  1. ^ "Mars Channels and Valleys". Msss.com. Retrieved 13 January 2015. 
  2. ^ Michael H. Carr (2006). The surface of Mars. Cambridge University Press. ISBN 978-0-521-87201-0. Retrieved 21 March 2011. 
  3. ^ Carr, M. 1979. Formation of martian flood features by release of water from confined aquifers. Journal of Geophysical Research 84: 2995-3007.
  4. ^ Hanna, J. and R. Phillips. 2005. Tectonic pressurization of aquifers in the formation of Mangala and Athabasca Valles on Mars. LPSC XXXVI. Abstract 2261.
  5. ^ Ghatan, Gil J.; Head, James W.; Wilson, L.; Leask, H.J. (2004). "Mangala Valles, Mars: Investigations of the Source of Flood Water and Early Stages of Flooding - Lunar and Planetary Science XXXV (2004)" (PDF). Lunar and Planetary Institute. Retrieved 6 December 2015. 
  6. ^ Leask, Harald J.; Wilson, Lionel; Mitchell, Karl L. (24 February 2007). "Formation of Mangala Fossa, the source of the Mangala Valles, Mars: Morphological development as a result of volcano-cryosphere interactions" (PDF). Journal of Geophysical Research 112 (E02011). doi:10.1029/2005JE002644. Retrieved 6 December 2015. 
  7. ^ Leask, Harald J.; Wilson, Lionel; Mitchell, Karl L. (4 August 2007). "Formation of Mangala Valles outflow channel, Mars: Morphological development and water discharge and duration estimates" (PDF). Journal of Geophysical Research 112 (E08003). doi:10.1029/2006JE002851. Retrieved 6 December 2015. 
  8. ^ Cabrol, N. and E. Grin (eds.). 2010. Lakes on Mars. Elsevier. NY.
  9. ^ Emrick, C. and R. De Hon. 1999. Flood discharge through Labou Vallis, Mars. Lunar Planet. Sci. Conf. XXX: Abstract #1893.
  10. ^ Zimbelman, J. et al. 1992. Volatile history of Mangala Valles, Mars. Journal of Geophysical Research 97: 18309-18317
  11. ^ De Hon, R. 1994. Lacustrine sedimentation in lower Mangals Valles. Mars Lunar Planet. Sci. Conf. XXVII: 295-296
  12. ^ Keskea, A., C. Hamilton, A. McEwen, I. Daubar. Episodes of fluvial and volcanic activity in Mangala Valles, Mars. Icarus:245, 333-347.
  13. ^ Leask, Harald J.; Wilson, Lionel; Mitchell, Karl L. (13 June 2006). "Formation of Ravi Vallis outflow channel, Mars: Morphological development, water discharge, and duration estimates". Journal of Geophysical Research 111 (E8). doi:10.1029/2005JE002550. Retrieved 4 December 2015. 
  14. ^ "Catalog Page for PIA03827". Photojournal.jpl.nasa.gov. Retrieved 13 January 2015. 
  15. ^ "The Planet Mars: A History of Observation and Discovery". Uapress.arizona.edu. Retrieved 13 January 2015. 

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