Difference between revisions of "Thaumasia quadrangle"

From Marspedia
Jump to: navigation, search
Line 35: Line 35:
 
Wikisliphergullies.jpg|Gullies in crater on the rim of Slipher Crater, as seen by CTX camera (on Mars Reconnaissance Orbiter)
 
Wikisliphergullies.jpg|Gullies in crater on the rim of Slipher Crater, as seen by CTX camera (on Mars Reconnaissance Orbiter)
  
−
47333 1215polygonsclose2.jpg|Close view of polygons near gullies in Ross Crater   
+
47333 1215polygonsclose2.jpg|Close view of polygons that are near gullies in Ross Crater   
  
 
Image:Gulliesthaumasal.jpg|Group of gullies, as seen by HiRISE under the HiWish program
 
Image:Gulliesthaumasal.jpg|Group of gullies, as seen by HiRISE under the HiWish program
 +
 
ESP 048546 1225gullies.jpg|Gullies
 
ESP 048546 1225gullies.jpg|Gullies
 
</gallery>
 
</gallery>

Revision as of 11:58, 14 March 2020

Mars topography (MOLA dataset) HiRes (1).jpg
MC-25 Thaumasia 30–65° S 60–120° W Quadrangles Atlas
  • USGS-Mars-MC-25-ThaumasiaRegion-mola.png
  • PIA00185-MC-25-ThaumasiaRegion-19980605.jpg

The Thaumasia quadrangle, is famous for showing us a good example of possible rainfall and rivers in the past in pictures of Warrego Valles taken with Mariner 9 and the Viking Orbiters. Those early images revealed a network of branching valleys. They were clear evidence that Mars may have once been warmer, wetter, and perhaps had precipitation in the form of rain or snow. Before we saw those pictures, we believed Mars was just an old, dry desert. The Thaumasia quadrangle is one of a series of 30 quadrangle maps of Mars used by the United States Geological Survey (USGS). The Thaumasia quadrangle is also referred to as MC-25 (Mars Chart-25).[1] The Thaumasia quadrangle covers the area from 30° to 65° south latitude and 60° to 120° west longitude (300-240 E). It encompasses many different regions or parts of many regions that have classical names. The northern part includes Thaumasia plateau. The southern part contains heavily cratered highland terrain and relatively smooth, low plains, such as Aonia Planum and Icaria Planum. Parts of Solis Planum, Aonia Terra, and Bosporus Planum are also found in this quadrangle. The east-central part includes Lowell Crater. Lowell Crater was named after Percival Lowell who studied Mars with a telescope in Flagstaff Arizona and then went around the world promoting the idea that Mars was inhabited[2] The name comes from Thaumas, the god of the clouds and celestial apparitions.[3]

Martian gullies

Gullies occur on steep slopes, especially on the walls of craters. Gullies are believed to be relatively young because they have few, if any craters. Moreover, they lie on top of sand dunes which themselves are considered to be quite young. Usually, each gully has an alcove, channel, and apron.[4] Gullies that were once thought to be caused by recent flowing water. However, with further extensive observations with HiRISE, it was found that many are forming/changing today, even though liquid water cannot exist under current Martian conditions. Faced with these new observations, scientists came up with other ideas to explain them. The consensus seems to be that although water may have helped form them in the past, today they are being produced by chunks of dry ice moving down steep slopes. [5] [6] [7] There is evidence here in this quadrangle that indeed water may have aided in the formation of gullies. Measurements of altitudes and slopes of gullies support the idea that snowpacks or glaciers are associated with gullies. Steeper slopes have more shade which would preserve snow.[8] [9] Higher elevations have far fewer gullies because ice would tend to sublimate more in the thin air of the higher altitude.[10] This relationship seems to hold true in Thaumasia. This region is fairly high in evlevation and has very few gullies; however, a few are present in the lower elevations like the one pictured below in Ross Crater.

  • CTX image of part of Ross Crater showing context for next image from HiRISE.

  • Gullies in Ross Crater, as seen by HiRISE under the HiWish program. Because the gullies are on the narrow rim of a crater and they start at different heights, this example is not consistent with the model of gullies being caused by aquifers.

  • Close-up of gullies showing multiple channels

  • Close-up of gullies showing streamlined forms in channels

  • Wide view of gullies in Ross Crater

  • Gullies in crater on the rim of Slipher Crater, as seen by CTX camera (on Mars Reconnaissance Orbiter)

  • Close view of polygons that are near gullies in Ross Crater

  • Group of gullies, as seen by HiRISE under the HiWish program

  • Gullies

Sand Dunes

Many places on Mars have sand dunes. Some craters in Thaumasia show dark blotches in them. High resolution photos show expose the dark markings as dark sand dunes. Dark sand dunes probably contain the igneous rock basalt.[11] Brashear Crater, pictured below, is one crater with dark dunes.

  • Wide view of Brashear Crater near other craters, as seen by Mars Orbiter Laser Altimeter (MOLA) in which elevations are indicated by different colors.

  • Mars Global Surveyor context image with box showing where next image is located.

  • Mars Global Surveyor image of part of area in the previous photo. The dark spots are resolved to be sand dunes. Image was taken under the MOC Public Targeting Program.

  • Crater floor covered with sand dunes in the shape of cells, as seen by HiRISE under HiWish program.

  • Lamont Crater, as seen by CTX camera (on Mars Reconnaissance Orbiter). Dark areas are composed of mostly dunes.

  • Dunes on floor of Lamont Crater, as seen by CTX camera (on Mars Reconnaissance Orbiter). Note: this is an enlargement of the previous image.

Warrego Valles

Mariner 9 and Viking Orbiter images, showed a network of branching valleys in Thaumasia called Warrego Valles. These networks are evidence that Mars may have once been warmer, wetter, and perhaps had precipitation in the form of rain or snow. A study with the Mars Orbiter Laser Altimeter, Thermal Emission Imaging System (THEMIS) and the Mars Orbiter Camera (MOC) support the idea that Warrego Valles was formed from precipitation.[12] At first glance they resemble river valleys on our Earth. But sharper images from more advanced cameras reveal that the valleys are not continuous. They are very old and may have suffered from the effects of erosion. A picture below shows some of these branching valleys.[13]

  • Channels near Warrego Valles, as seen by THEMIS. These branched channels are strong evidence for flowing water on Mars, perhaps during a much warmer period.

Craters

Thaumasia is in the old southern highlands of Mars. As such it is loaded with craters. Craters are important to scientists. The density of impact craters is used to determine the surface ages of Mars and other solar system bodies.[14] The older the surface, the more craters present. Crater shapes can reveal the presence of ground ice. The area around craters may be rich in minerals. On Mars, heat from the impact melts ice in the ground. Water from the melting ice dissolves minerals, and then deposits them in cracks or faults that were produced with the impact. This process, called hydrothermal alteration, is a major way in which ore deposits are produced. The area around Martian craters may be rich in useful ores for the future colonization of Mars.[15] Studies on the earth have documented that cracks are produced and that secondary minerals veins are deposited in the cracks.[16] [17] [18] Images from satellites orbiting Mars have detected cracks near impact craters.[19] Great amounts of heat are produced during impacts. The area around a large impact may take hundreds of thousands of years to cool.[20] [21][22] Many craters once contained lakes.[23] [24] [25] Because some crater floors show deltas, we know that water had to be present for some time. Dozens of deltas have been spotted on Mars.[26] Deltas form when sediment is washed in from a stream entering a quiet body of water. It takes a bit of time to form a delta, so the presence of a delta is exciting; it means water was there for a time, maybe for many years. Primitive organisms may have developed in such lakes; hence, some craters may be prime targets for the search for evidence of life on the Red Planet.[27]

  • Unnamed rater with thin ejecta, as seen by HiRISE under the HiWish program There are also many cones visible in the image.

  • East side of Douglass Crater, as seen by CTX camera (on Mars Reconnaissance Orbiter)

  • Lampland Crater, as seen by CTX camera (on Mars Reconnaissance Orbiter).

  • Layers in wall of Lampland Crater, as seen by CTX camera (on Mars Reconnaissance Orbiter). Note: this is an enlargement of the previous image of Lampland Crater.

  • Pointed crater, as seen by HiRISE under HiWish program Impacting object may have struck at a low angle.

  • Wide view of crater floor, as seen by HiRISE under HiWish program Some depressions on the floor have a mound in the center.

  • Concentric ridges on crater floor, as seen by HiRISE under HiWish program

Channels

In the nearly half century of studying the Red Planet with orbiting satellites, much evidence has accumulating to prove that water once flowed in river valleys on Mars.[28] [29] Images of curved channels have been seen in images from Mars spacecraft dating back to the early seventies with the Mariner 9 orbiter.[30] [31] [32] [33] Indeed, a study published in June 2017, calculated that the volume of water needed to carve all the channels on Mars was even larger than the proposed ocean that the planet may have had. Water was probably recycled many times from the ocean to rainfall around Mars.[34][35]

  • Branched channels in Thaumasia quadrangle, as seen by Viking Orbiter. Networks of channels like this are strong evidence for rain on Mars in the past.

  • Crater and one of many nearby channels, as seen by HiRISE under HiWish program Picture is from Icaria Planum.

  • Channel, as seen by HiRISE under HiWish program

  • Channel In this image you can see how the channel cut through a ridge.

  • Channel, as seen by HiRISE under HiWish program Location is 36.968 S and 78.121 W.

  • Crater with channels, as seen by HiRISE under HiWish program Arrows show channels that carried water into and out of crater.

Latitude dependent mantle

Much of the Martian surface is covered with a thick ice-rich, mantle layer that has fallen from the sky a number of times in the past.[36] [37] [38]

  • Mantle layers exposed on crater rim, as seen by HiRISE under HiWish program Mantle is an ice-rich material that fell from the sky when the climate underwent major changes.

  • Layers in mantle deposit, as seen by HiRISE, under the HiWish program. Mantle was probably formed from snow and dust falling during a different climate.

  • Signs of material moving down the side of a ridge, as seen by HiRISE, under the HiWish program.

Dust devil tracks

Dust devil tracks are very common on Mars, especially in certain seasons. Dust devils can create very pretty tracks. Dust devils remove bright colored dust from the Martian surface; thereby exposing a dark layer. A thin coating of fine bright dust covers most of the Martian surface. When a dust devil goes by it blows away the coating and exposes the underlying dark surface creating tracks. It does not take too much fine dust to cover those tracks--experiments in Earth laboratories demonstrate that only a few 10's of microns of dust will be enough. The width of a single human hair ranges from approximately 20 to 200 microns (μm); consequently, the dust that can cover dust devil tracks may only be the thickness of a human hair.[39] Dust devils on Mars have been photographed both from the ground and high overhead from orbit. They have even blown dust off the solar panels of two Rovers on Mars, thereby greatly extending their useful lifetime.[40] The pattern of tracks has been shown to change every few months.[41] A study that combined data from the High Resolution Stereo Camera (HRSC) and the Mars Orbiter Camera (MOC) found that some large dust devils on Mars have a diameter of 700 m and last at least 26 minutes.[42]

  • Dust devil tracks just outside north rim of Fontana Crater, as seen by CTX camera (on Mars Reconnaissance Orbiter). Note: this is an enlargement of the previous image of Fontana Crater.

  • Biachini Crater, as seen by CTX camera (on Mars Reconnaissance Orbiter). Dust devil tracks and dunes are visible on the floor. The narrow, dark lines are dust devil tracks.

Other views from Thaumasia

  • Possible dike in Thaumasia, as seen by HiRISE under HiWish program. Dikes may have deposited valuable minerals.

  • Strange surface features, as seen by HiWish under the HiWish program.

  • Curved ridge that probably was formed by glacier, as seen by HiRISE under HiWish program

  • Flows, as seen by HiRISE under HiWish program

  • Brain terrain, as seen by HiRISE under HiWish program Box shows the size of football field.

  • Cracks and pits that form square shapes, as seen by HiRISE under HiWish program Arrow points to squares formed by cracks.

  • Ridges, as seen by HiRISE under HiWish program

  • Dark slope streaks, as seen by HiRISE under HiWish program

See also

References

  1. ↑ Davies, M.E.; Batson, R.M.; Wu, S.S.C. "Geodesy and Cartography" in Kieffer, H.H.; Jakosky, B.M.; Snyder, C.W.; Matthews, M.S., Eds. Mars. University of Arizona Press: Tucson, 1992.
  2. ↑ http://areology.blogspot.com/2010/06/ancient-lava-plain-in-thaumasia-planum.html
  3. ↑ Blunck, J. 1982. Mars and its Satellites. Exposition Press. Smithtown, N.Y.
  4. ↑ Edgett |first1= K. |last2= Malin |first2= M. C. |last3= Williams |first3= R. M. E. |last4= Davis |first4= S. D. |date= 2003 |title= Polar-and middle-latitude martian gullies: A view from MGS MOC after 2 Mars years in the mapping orbit |journal= Lunar Planet. Sci. |volume=34 |at=p. 1038, Abstract 1038 | url=http://www.lpi.usra.edu/meetings/lpsc2003/pdf/1038.pdf |
  5. ↑ Harrington |first=J.D. |last2=Webster |first2=Guy |title=RELEASE 14-191 – NASA Spacecraft Observes Further Evidence of Dry Ice Gullies on Mars |url=http://www.nasa.gov/press/2014/july/nasa-spacecraft-observes-further-evidence-of-dry-ice-gullies-on-mars |date=July 10, 2014 |work=NASA
  6. ↑ CNRS. "Gullies on Mars sculpted by dry ice rather than liquid water." ScienceDaily. ScienceDaily, 22 December 2015. www.sciencedaily.com/releases/2015/12/151222082255.htm
  7. ↑ http://www.skyandtelescope.com/astronomy-news/martian-gullies-triggered-by-exploding-dry-ice-122320158
  8. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named planetary.brown.edu
  9. ↑ Dickson, J. et al. 2007. Martian gullies in the southern mid-latitudes of Mars Evidence for climate-controlled formation of young fluvial features based upon local and global topography. Icarus: 188. 315-323.
  10. ↑ Hecht, M. 2002. Metastability of liquid water on Mars. Icarus: 156. 373-386.
  11. ↑ Michael H. Carr|title=The surface of Mars|url=https://books.google.com/books?id=uLHlJ6sjohwC%7Caccessdate=21 March 2011|year=2006|publisher=Cambridge University Press|isbn=978-0-521-87201-0
  12. ↑ Ansan, V and N. Mangold. 2006. New observations of Warrego Valles, Mars: Evidence for precipitation and surface runoff. Icarus. 54:219-242.
  13. ↑ http://www.msss.com/mars_images/moc/2004/10/03/
  14. ↑ http://www.lpi.usra.edu/publications/slidesets/stones/
  15. ↑ http://www.indiana.edu/~sierra/papers/2003/Patterson.html.
  16. ↑ Osinski, G, J. Spray, and P. Lee. 2001. Impact-induced hydrothermal activity within the Haughton impact structure, arctic Canada: Generation of a transient, warm, wet oasis. Meteoritics & Planetary Science: 36. 731-745
  17. ↑ http://www.ingentaconnect.com/content/arizona/maps/2005/00000040/00000012/art00007
  18. ↑ Pirajno, F. 2000. Ore Deposits and Mantle Plumes. Kluwer Academic Publishers. Dordrecht, The Netherlands
  19. ↑ Head, J. and J. Mustard. 2006. Breccia Dikes and Crater-Related Faults in Impact Craters on Mars: Erosion and Exposure on the Floor of a 75-km Diameter Crater at the Dichotomy Boundary. Special Issue on Role of Volatiles and Atmospheres on Martian Impact Craters Meteoritics & Planetary Science
  20. ↑ name="news.discovery.com"
  21. ↑ Segura, T, O. Toon, A. Colaprete, K. Zahnle. 2001. Effects of Large Impacts on Mars: Implications for River Formation. American Astronomical Society, DPS meeting#33, #19.08
  22. ↑ Segura, T, O. Toon, A. Colaprete, K. Zahnle. 2002. Environmental Effects of Large Impacts on Mars. Science: 298, 1977-1980.
  23. ↑ Cabrol, N. and E. Grin. 2001. The Evolution of Lacustrine Environments on Mars: Is Mars Only Hydrologically Dormant? Icarus: 149, 291-328.
  24. ↑ Fassett, C. and J. Head. 2008. Open-basin lakes on Mars: Distribution and implications for Noachian surface and subsurface hydrology. Icarus: 198, 37-56.
  25. ↑ Fassett, C. and J. Head. 2008. Open-basin lakes on Mars: Implications of valley network lakes for the nature of Noachian hydrology.
  26. ↑ Wilson, J. A. Grant and A. Howard. 2013. INVENTORY OF EQUATORIAL ALLUVIAL FANS AND DELTAS ON MARS. 44th Lunar and Planetary Science Conference.
  27. ↑ Newsom H., Hagerty J., Thorsos I. 2001. Location and sampling of aqueous and hydrothermal deposits in martian impact craters. Astrobiology: 1, 71-88.
  28. ↑ Baker, V., et al. 2015. Fluvial geomorphology on Earth-like planetary surfaces: a review. Geomorphology. 245, 149–182.
  29. ↑ Carr, M. 1996. in Water on Mars. Oxford Univ. Press.
  30. ↑ Baker, V. 1982. The Channels of Mars. Univ. of Tex. Press, Austin, TX
  31. ↑ Baker, V., R. Strom, R., V. Gulick, J. Kargel, G. Komatsu, V. Kale. 1991. Ancient oceans, ice sheets and the hydrological cycle on Mars. Nature 352, 589–594.
  32. ↑ Carr, M. 1979. Formation of Martian flood features by release of water from confined aquifers. J. Geophys. Res. 84, 2995–300.
  33. ↑ 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.
  34. ↑ http://spaceref.com/mars/how-much-water-was-needed-to-carve-valleys-on-mars.html
  35. ↑ Luo, W., et al. 2017. New Martian valley network volume estimate consistent with ancient ocean and warm and wet climate. Nature Communications 8. Article number: 15766 (2017). doi:10.1038/ncomms15766
  36. ↑ Hecht | first1 = M | year = 2002 | title = Metastability of water on Mars | url = | journal = Icarus | volume = 156 | issue = 2| pages = 373–386 | doi=10.1006/icar.2001.6794 |
  37. ↑ Mustard | first1 = J. |display-authors=etal | year = 2001 | title = Evidence for recent climate change on Mars from the identification of youthful near-surface ground ice | url = | journal = Nature | volume = 412 | issue = 6845| pages = 411–414 |
  38. ↑ Pollack | first1 = J. | last2 = Colburn | first2 = D. | last3 = Flaser | first3 = F. | last4 = Kahn | first4 = R. | last5 = Carson | first5 = C. | last6 = Pidek | first6 = D. | year = 1979 | title = Properties and effects of dust suspended in the martian atmosphere | url = | journal = J. Geophys. Res. | volume = 84 | issue = | pages = 2929–2945 | doi=10.1029/jb084ib06p02929 |
  39. ↑ https://en.wikipedia.org/wiki/Micrometre
  40. ↑ http://marsrovers.jpl.nasa.gov/gallery/press/spirit/20070412a.html Mars Exploration Rover Mission: Press Release Images: Spirit. Marsrovers.jpl.nasa.gov. Retrieved on 7 August 2011.
  41. ↑ http://hirise.lpl.arizona.edu/PSP_005383_1255
  42. ↑ Reiss, D. et al. 2011. Multitemporal observations of identical active dust devils on Mars with High Resolution Stereo Camera (HRSC) and Mars Orbiter Camera (MOC). Icarus. 215:358-369.

Further reading

  • Lorenz, R. 2014. The Dune Whisperers. The Planetary Report: 34, 1, 8-14
  • Lorenz, R., J. Zimbelman. 2014. Dune Worlds: How Windblown Sand Shapes Planetary Landscapes. Springer Praxis Books / Geophysical Sciences.

External links

Retrieved from "https://marspedia.org/index.php?title=Thaumasia_quadrangle&oldid=134825"