Holden (Martian crater)

This article is about the crater on Mars. For its namesake on the Moon, see Holden (lunar crater). For other things and people named Holden, see Holden (disambiguation).
Holden

Crater Holden based on THEMIS day-time image
Planet Mars
Coordinates 26°24′S 34°00′W / 26.4°S 34.0°W / -26.4; -34.0Coordinates: 26°24′S 34°00′W / 26.4°S 34.0°W / -26.4; -34.0
Diameter 153.8
Eponym Edward S. Holden

Holden is a 140 km wide crater situated within the Margaritifer Sinus quadrangle (MC-19) region of the planet Mars, located with the southern highlands. It is named after Edward Singleton Holden, an American astronomer, and the founder of the Astronomical Society of the Pacific.[1] It is part of the * Uzboi-Landon-Morava (ULM) system.

Like Gusev, it is notable for an outlet channel, Uzboi Vallis, that runs into it, and for many features that seem to have been created by flowing water. It's believed that Holden Crater was formed by an impact between the Noachian to Hesperian Epochs.[2][3][4]

The crater's rim is cut with gullies, and at the end of some gullies are fan-shaped deposits of material transported by water.[5] The crater is of great interest to scientists because it has some of the best-exposed lake deposits. One of the layers has been found by the Mars Reconnaissance Orbiter to contain clays.[6][7] Clays only form in the presence of water. There are two unit of sediments in the crater. The lower unit formed in a large lake. It is believed the lake waters originated from the crater walls/or groundwater. Water from the crater walls may have come from precipitation when the Martian climate was different. The upper unit formed when water that was ponded to the south in Uzboi Vallis broke through Holden's rim.[2] It is believed that great amount of water went through the rim; one flow was caused by a body of water larger than Earth's Lake Huron.[8] Some of the evidence for such a large flow of water is the presence of boulders tens of meters in size sticking above the surface. To transport such huge rocks takes a great deal of water.

Holden is an old crater, containing numerous smaller craters, many of which are filled with sediment. The crater's central mountain is also obscured by sediment. Holden Crater was a proposed landing site for NASA's Mars Science Laboratory, until Gale Crater was deemed a better landing site. Just to the north east of Holden Crater is Eberswalde Crater which contains a large delta. The lower beds of Holden are thought by some to maybe similar to materials in Eberswalde Crater.[9][10] However, Holden Crater is now considered a potential landing site for the Mars 2020 rover. In the second Mars 2020 Landing Site Workshop it survived the cut and was named to be among the top 8 sites still in the running for the landing.[11]

Geologic history of Holden Crater

Studies of the whole region around Holden Crater have resulted in an understanding of a complex sequence of events that shaped the crater, which included two different lakes.[12] A large series of rivers called the Uzboi-Ladon-Morava (ULM) system drained water from the Argyre Basin, site of a large lake.[13][14][15] When an impact occurred and produced Holden Crater, the system was blocked by a crater rim almost a kilometer in height. Eventually water from drainage from the walls, with possibly a contribution from groundwater, collected to make the first lake.[16][17][18] This lake was deep and long lasting. The lowest level of sedimentary rocks was deposited in this lake. Much water was inbounded in Uzboi Vallis because the rim of Holden Crater blocked the flow. Some of the backed up water came from Nirgal Vallis which had a discharge of 4800 cubic meters/second.[19] At a certain point the stored water broke through the rim of Holden and created a second, shorter lived lake 200–250 m deep.[20] Water with a depth of at least 50 m entered Holden at a rate that 5-10 times the discharge of the Mississippi River.[2][21][22][23] Terraces and the presence of large rocks (tens of meters across) support these high discharge rates.[16][21][24][25][26]

Mars Science Laboratory

Several sites in the Margaritifer Sinus quadrangle were proposed as areas to send NASA's next major Mars rover, the Mars Science Lab. Holden Crater made the cut to be among the top four. Holden Crater is believed to have once been a lake.

The aim of the Mars Science Laboratory is to search for signs of ancient life. It is hoped that a later mission could then return samples from sites identified as probably containing remains of life. To safely bring the craft down, a 12 mile wide, smooth, flat circle is needed. Geologists hope to examine places where water once ponded.[27] They would like to examine sediment layers.

Holden was one of seven finalists for the MSL landing site:[28]

However, Curiosity instead landed in Gale Crater.

Breccia in the crater Holden, taken by HiRISE

.

See also

References

  1. ↑ http://www.google.com/mars/
  2. 1 2 3 Grant, J. et al. 2008. HiRISE imaging of impact megabreccia and sub-meter aqueous strata in Holden Crater, Mars. Geology: 36, 195-198.
  3. ↑ Pondrelli, M. et al. 2005. Complex evolution of paleoslacustrine systems on Mars: An example from the Holden crater. J. Geophys. Res. 110, E04016, doi:10.1029/2004JE002335.
  4. ↑ Scott, D., K. Tanaka. 1986. Geologic map of the western equatorial region of Mars, U. S. Geol. Surv. Misc. Invest. Ser. Map I-1802-A.
  5. ↑ Moore, J. A. Howard. 2005. Large alluvial fans on Mars. Journal of Geophysical Research: 110, E04005.
  6. ↑ Murchie, S. et al. 2009. A synthesis of Martian aqueous mineralogy after 1 Mars year of observations from the Mars Reconnaissance Orbiter. Journal of Geophysical Research: 114.
  7. ↑ Grotzinger, J. and R. Milliken (eds.) 2012. Sedimentary Geology of Mars. SEPM
  8. ↑ http://hirise.lpl.arizona.edu/PSP_003077_1530
  9. ↑ Malin, M., K. Edgett. 2003. Evidence for persistent flow and aqueous sedimentation on Mars. Science: 302, 1931-1934.
  10. ↑ Moore, J. et al. 2003. Marian layered fluvial deposits: implications for Noachian climate scenarios. Geophys. Res. letts. 30, doi:10,1029/2003GL019002.
  11. ↑ Golombek, J. et al. 2016. Downselection of landing Sites for the Mars 2020 Rover Mission. 47th Lunar and Planetary Science Conference (2016). 2324.pdf
  12. ↑ Grant, J. 1987. The geomorphic evolution of Eastern Margaritifer Sinus, Mars. Adv. Planet. Geol. NASA Tech memo. 89889871, 1-268.
  13. ↑ Baker, V. 1982. The Channels of Mars. University of Texas Press, Austin, TX.
  14. ↑ Philillips, R. et al. 2001. Ancient geodynamics and global-scale hydrology on Mars. Science: 291, 2587_2591.
  15. ↑ Saunders, S. 1979. Geologic map of the Margaritifer Sinus quadrangle of Mars, U.S> Geol. Surv. Misc. Invest. Ser. Map I-1144, scale 1:5M.
  16. 1 2 Cabrol, N. and E. Grin (eds.). 2010. Lakes on Mars. Elsevier. NY
  17. ↑ Malin, M., K. Edgett. 2000. Evidence for recent groundwater seepage and surface runoff on Mars. Science: 302, 1931–1934.
  18. ↑ Moore, J., A. Howard. 2005. Large alluvial fans on Mars. J. Geophys. Res. 110, E04005, doi:10.1029/2005JE002352.
  19. ↑ Irwin, J., R. Craddock, R. Howard. 2005. Interior channels in Martian valley networks: Discharge and runoff production. Geology: 33,489-492.
  20. ↑ Grant, J., R. Irwin, S. Wilson. 2010. Aqueous depositional settings in Holden crater, Mars In Cabrol, N. and E. Grin (eds.). 2010. Lakes on Mars. Elsevier. NY.
  21. 1 2 Grant, J., T. Parker. 2002. Drainage evolution of the Margaritifer Sinus region, Mars. J. Geophysic. Res. 107, doi:10.1029/2001JE001678.
  22. ↑ Komar, P. 1979. Comparisons of the hydraulics of water flows in Martian outflow channels with flows of similar scale on Earth. Icarus: 37, 156-181.
  23. ↑ Irwin, et al. 2005. An intense terminal epoch of widespread fluvial activity on early Mars: 2. Increased runoff and paleolake development. J. Geophysical. Res. 110, E12S14, doi: 10.1029/2005JE002460.
  24. ↑ Boothroyd, J. 1983. Fluvial drainage systems in the Ladon Basin area: Margaritifer Sinus area, Mars. Geol. Soc. Am. Abstr. Programs 15, 530
  25. ↑ Grant, J. 1987. The geomorphic evolution of Eastern Margaritifer Sinus, Mars. Adv. Planet. Geol. NASA Tech memo. 89871, 1-268.
  26. ↑ Parker, T. 1985. Geomorphology and geology of the southwestern Margaritifer Sinus-northern Argyre region of Mars, California State University, M. S. Thesis, Los Angeles, California
  27. ↑ http://themis.asu.edu/features/ianichaos
  28. ↑
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