Syrtis Major quadrangle

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Mars topography (MOLA dataset) HiRes (1).jpg
MC-13 Syrtis Major 0–30° N 45–90° E Quadrangles Atlas
  • USGS-Mars-MC-13-SyrtisMajorRegion-mola.png
  • Syrtis Major MC-13 - PIA00173.tiff

The Syrtis Major quadrangle covers latitudes 0° to 30° N and longitudes 270° to 315° W (45-90E). Syrtis Major quadrangle includes some other named regions: Syrtis Major Planum, and parts of Terra Sabaea and Isidis Planitia.[1] Geologically, Syrtis Major is an ancient shield volcano with a central depression that is elongated in a north-south direction. Calderas are large openings at the top of volcanoes. Syrtis Major contains the calderas named Meroe Patera and Nili Patera.[2] Other geologically interesting features in the area include dikes and inverted terrain. The Beagle 2 lander crashed in this quadrangle in December 2003. In January 2015, NASA reported the Beagle 2 that had found it in Isidis Planitia (location is about 11.5265 N and 90.4295E.[3] [4] [5] It was imaged by HiRISE onboard the Mars Reconnaissance Orbiter. Beagle 2 looked intact.[6] [7] [8] In November 2018, NASA announced that Jezero crater was chosen as the landing site for the planned Mars 2020 mission.[9] Jezero Crater is located at 18.855N and 77.519 E[10] The rest of this article will cover significant scientific discoveries and show what the landscape looks like close up. We will be learning and hearing much more about this area when Mars 2020 lands in Jezero Crater.


jezero Crater Delta

How named

Syrtis Major is named after the classical Roman name Syrtis maior for the Gulf of Sidra that is found on the coast of Libya (classical Cyrenaica). Interestingly, Syrtis Major is near Cyrene which accoding to the Bilbe is the place where "Simon" who carried the cross of Jesus was from.[11] [12] [13]

Discovery and history

Syrtis Major is the main marking that people see when they look at Mars through a backyard telescope. It was discovered by Christiaan Huygens, who included it in a drawing of Mars in 1659 and was originally known as the "Hourglass Sea.” Different cartographers have given it different names over centuries. Johann Heinrich von Mädler in 1840 called the feature “Atlantic Canale.” Richard Proctor called it “Kaiser Sea” in 1867. A little later, Camille Flammarion called it the “Mer du Sablier” (French for "Hourglass Sea") when he updated Proctor's naming system in 1876. Syrtis Major, the name that has stock was picked by Giovanni Schiaparelli when he created a map based on observations made during Mars' close approach to Earth in 1877.[14] [15]

Igneous rocks

The Syrtis Major region is of great interest to geologists since several types of igneous rocks have been found there with orbiting spacecraft. Besides basalt, dacite and granite have been found there with orbiting satellites. Dacite originates under volcanoes in magma chambers. In magma chambers new minerals and rocks are put together. After heavy minerals (olivine and pyroxene) containing iron and magnesium have settled to the bottom, Dacites form at the top of the chamber. Granite is formed by an even more complex process.[16] Some areas of Syrtis Major contain large amounts of the mineral olivine. Olivine turns into other minerals very rapidly in the presence of water, so if we find olivine, we know that the place has been dry for a long time.[17]

Minerals

A variety of important minerals have been discovered near Nili Fossae, a major trough system in Syrtis Major. Besides olivine, other minerals found there include carbonates, aluminum smectite, iron/magnesium smectite, hydrated silica, kaolinite group minerals, and iron oxides.[18] [19] In December 2008, NASA's Mars Reconnaissance Orbiter found carbonate minerals, a geologically significant discovery.[20] [21][22] Later research published in October 2010, described a large deposit of carbonate rocks found inside Leighton Crater. The rocks at one time were buried 4 miles below the surface. This discovery has great importance in understanding the history of the planet. Finding carbonates in an underground location means that Mars may have been warmer and may have had atmospheric carbon dioxide and ancient seas. Because the carbonates were found near silicate minerals and clays, hydrothermal systems like the deep sea vents on Earth may have been present.[23] [24] Other minerals found by the Mars Reconnaissance Orbiter are aluminum smectite, iron/magnesium smectite, hydrated silica, kaolinite group minerals, iron oxides, and talc.[25] [26] NASA scientists have also discovered that Nili Fossae is the source of plumes of methane, raising the question of whether this source originates from biological sources.[27] [28]

Dikes

Narrow ridges occur in some places on Mars. They may be formed by different means, but some are probably caused by molten rock moving underground and moving along cracks or faults in the rock. When they cool, walls of hard rock may be formed after being exposed by the erosion of softer, surrounding materials. Such a feature is termed a dike. They are common on Earth—a famous one is Shiprock, New Mexico;[29] [30]

  • Dikes near Shiprock, New Mexico

Mapping the presence of dikes allows us to understand how magma (molten rock under the ground) travels and where it could have interacted with surrounding rock, thus producing valuable ores. Deposits of important minerals are also made by dikes and other types of magma movements. These superhot liquid rocks heat water. The hot water dissolves minerals that are deposited in cracks in nearby rock. This process has given us many sources of important minerals.[31] One would expect a great deal of intrusive igneous activity (molten rock under the ground) to occur on Mars because it is believed there is more igneous activity under the ground than on top, and Mars has many huge volcanoes. In other words, more liquid rock was under the surface than in the many massive Martian volcanoes.[32]

Dike

Linear Ridge Networks

Ridges

Some crater floors in the Syrtis Major area show elongated ridges arranged in a complex pattern. Scientists are still debated over the exact origin of these features. Some have suggested that they are dikes made up of molten rock; others have advanced the idea that other fluids such as water were involved.[33] The ridges are found where there has been erosion.

Close, color view of ridges
Close, color view of ridges, as seen by HiRISE under HiWish program


Ridges

Dunes

Wide view of dunes

Sand dunes are found all over Mars, especially in low spots like craters and the floors of old river valleys.Dunes on the floor of Arnus Vallis, an old river valley are visible in a picture below. Dunes in valleys on Mars usually lie at right angles to the valley walls.

Dunes, as seen by HiRISE under HiWish program
Color view of dune

Streaks

Astronomers have watched the surface of Mars change. For a long time, astronomers observing regular changes on Mars when the seasons changed, thought that what they were seeing was evidence of vegetation growing. Close inspection with a number of spacecraft, revealed other possibilities. We came to understand that changes are caused by the effects of the wind blowing dust around. Sometimes, fine bright dust settles on the dark basalt rock making the surface appear lighter, at other times the light-toned dust will be blown away; thus making the surface darken—just as if vegetation were growing. Mars has frequent regional or global dust storms that coat the surface with fine bright dust.

  • Light-toned streak on the lee ward side of a crater, as seen by HiRISE under HiWish program

Inverted relief

Some places on Mars show inverted relief. In these locations, a stream bed may be a raised feature, instead of a valley. Inverted former stream channels may be caused by the deposition of large rocks, cementation, or maybe by lava moving down the channel. In either case erosion would erode the surrounding land and leave the old channel as a raised ridge because the ridge would be more resistant to erosion. Images below, taken with HiRISE show curved ridges that are old channels that have become inverted. They have the shape of streams but are above ground.[34]


Possible inverted streams, as seen by HiRISE under HiWish program

Layers

Many places on Mars show rocks arranged in layers. Rock can form layers in a variety of ways. Volcanoes, wind, or water can produce layers.[35] Many layers on Mars are due to frequent large changes in the rotational axis that cause the climate to undergo drastic changes. Mars experiences such tilt variations because it lacks a large moon to stabilize its tilt. A detailed discussion of layering with many Martian examples can be found in Sedimentary Geology of Mars.[36]

Tilted rock layers, as seen by HiRISE under HiWish program
Rock layers in Flammarion Crater
Close view of layers Only part of the image is in color since HiRISE images only show a middle part in color.

Channels

Channels along wall of Peridier Crater, as seen by CTXcamera (on Mars Reconnaissance Orbiter).

There is enormous evidence that water once flowed in river valleys on Mars.[37] [38] Images of curved channels have been seen in images from Mars spacecraft dating back to the early seventies with the Mariner 9 orbiter.[39][40] [41] [42] One 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.[43][44]

Pictures below shown some of the many channels that have been observed on the Red Planet.

  • Channel, as seen by HiRISE under HiWish program

  • Channel, as seen by HiRISE under HiWish program

Channels and ridges, as seen by HiRISE under HiWish program

Hollows

Crater with eroding floor deposit
Close view of pits forming in crater floor deposit. The box shows the size of a football field for scale.

Ground with hollowed out spots is common in some places on Mars. Sometimes giant hollows are formed. In other places, like the ones shown here, the hollows are of more modest size. The ones here would make for good mazes to walk through. Since much of the ground on Mars is ice-rich, when ice leaves high and low spots appear. Ice leaves the ground today on Mars by the process of sublimation. Ice changes directly to a gas and goes into the atmosphere.

  • Hollows that formed in crater floor deposit, as seen by HiRISE under HiWish program

  • Eroding mesa in Syrtis Major. It would be rough to walk across this feature. Image was taken with Mars Global Surveyor, under the MOC Public Targeting Program.

  • Close-up of crater deposit that shows both impact craters and pit craters caused by collapse.

Close-up of crater deposit that shows both impact craters and pit craters caused by collapse.

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://www.daviddarling.info/encyclopedia/S/SyrtisMajor.html
  3. ↑ Ellison, Doug (16 January 2015). "re Beagle 2 location on Mars => "Using HiView on image ESP_039308_1915_COLOR.JP2 I get 90.4295E 11.5265N"". Twitter & JPL.
  4. ↑ Grecicius, Tony; Dunbar, Brian (16 January 2015). "Components of Beagle 2 Flight System on Mars". NASA. https://twitter.com/doug_ellison/status/556201983443357696 |
  5. ↑ ="NASA-20150116-TG" Grecicius |first1=Tony |last2=Dunbar |first2=Brian |title=Components of Beagle 2 Flight System on Mars |url=http://www.nasa.gov/jpl/mars/pia19106/ |date=16 January 2015
  6. ↑ name="NASA-20150116" Webster |first=Guy |title='Lost' 2003 Mars Lander Found by Mars Reconnaissance Orbiter |url=http://www.nasa.gov/jpl/lost-2003-mars-lander-found-by-mars-reconnaissance-orbiter/ |date=16 January 2015 |work=NASA |
  7. ↑ https://www.nytimes.com/2015/01/17/science/space/missing-lander-beagle-2-finally-located-on-mars.html |date=16 January 2015 |work=New York Times
  8. ↑ Amos |first=Jonathan |title=Lost Beagle2 probe found 'intact' on Mars |url=https://www.bbc.co.uk/news/science-environment-30784886 |date=16 January 2015
  9. ↑ "SPC-20181119">Wall |first=Mike |title=Jezero Crater or Bust! NASA Picks Landing Site for Mars 2020 Rover |url=https://www.space.com/42486-mars-2020-rover-jezero-crater-landing-site.html |date=19 November 2018 |work=Space.com |
  10. ↑ Wray, James (6 June 2008). "Channel into Jezero Crater Delta". NASA.
  11. ↑ https://ferrelljenkins.wordpress.com/2011/03/30/libya-and-the-bible-%E2%80%94-more-than-you-think/
  12. ↑ https://books.google.com/books?id=3JNQAQAAMAAJ&pg=PA18 The Cambridge Bible for Schools and Colleges, Volume 59
  13. ↑ Gleig, G. and T. Stackhouse. A History of the holy Bible, corrected and improved. https://books.google.com/books?id=jVIOAAAAQAAJ&pg=PA286
  14. ↑ Mapping Mars: Science, Imagination, and the Birth of a World| first=Oliver| last=Morton| publisher=Picador USA| location=New York| date=2002| isbn=0-312-24551-3| pages=14–15|
  15. ↑ http://www.uapress.arizona.edu/onlinebks/mars/chap04.htm%7Ctitle=The Planet Mars: A History of Observation and Discovery - Chapter 4: Areographers|author=William Sheehan|
  16. ↑ Christensen, P. 2005. "The Many Faces of Mars". Scientific American. July, 2005.
  17. ↑ http://www.marsdaily.com/news-odyssey-05a.html
  18. ↑ http://news.bbc.co.uk/2/hi/science/nature/7791060.stm "Nasa finds 'missing' Mars mineral"
  19. ↑ 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. E00D06.
  20. ↑ http://news.bbc.co.uk/2/hi/science/nature/7791060.stm NASA finds 'missing' Mars mineral
  21. ↑ http://www.space.com/30746-mars-missing-atmosphere-lost-in-space.html
  22. ↑ Edwards, C., B. Ehlmann. 2015. "Carbon sequestration on Mars". Geology: doi: 10.1130/G36983.1.
  23. ↑ http://www.astrobio.net/pressrelease/3646/exposed-rocks-point-to water-on-ancient-mars
  24. ↑ 1.Adrian J. Brown, Simon J. Hook, Alice M. Baldridge, James K. Crowley, Nathan T. Bridges, Bradley J. Thomson, Giles M. Marion, Carlos R. de Souza Filho, Janice L. Bishop. "Hydrothermal formation of Clay-Carbonate alteration assemblages in the Nili Fossae region of Mars". Earth and Planetary Science Letters, 2010;
  25. ↑ 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. E00D06.
  26. ↑ Adrian J. Brown, Simon J. Hook, Alice M. Baldridge, James K. Crowley, Nathan T. Bridges, Bradley J. Thomson, Giles M. Marion, Carlos R. de Souza Filho, Janice L. Bishop. "Hydrothermal formation of Clay-Carbonate alteration assemblages in the Nili Fossae region of Mars". Earth and Planetary Science Letters, 2010;
  27. ↑ http://dsc.discovery.com/news/2009/01/15/mars-methane-life.html Mars Methane Found, Raising Possibility of Life
  28. ↑ http://news.bbc.co.uk/2/hi/science/nature/7829315.stm New light on Mars methane mystery
  29. ↑ http://www.msss.com/mars_images/moc/2005/10/13/
  30. ↑ isbn = 0-87842-105-X|title = Roadside Geology of Colorado|last1 = Chronic|first1 = Halka|date = January 1980
  31. ↑ Namowitz, S. and D. Stone. 1975. Earth Science-The World We Live In. American Book Company. Ny, NY
  32. ↑ Crisp, J. 1984. "Rates of magma emplacement and volcanic output". J. Volcanlo. Geotherm. Res: 20. 177-211.
  33. ↑ Saper, L., J. Mustard. 2013. "Extensive linear ridge networks in Nili Fossae and Nilosyrtis, Mars: implications for fluid flow in the ancient crust". Geophysical Research Letters: 40, 245-249.
  34. ↑ http://hiroc.lpl.arizona.edu/images/PSP/diafotizo.php?ID=PSP_002279_1735
  35. ↑ http://hirise.lpl.arizona.edu?PSP_008437_1750 |title=HiRISE | High Resolution Imaging Science Experiment |publisher=Hirise.lpl.arizona.edu?psp_008437_1750 |
  36. ↑ Grotzinger, J. and R. Milliken (eds.). 2012. Sedimentary Geology of Mars. SEPM.
  37. ↑ Baker, V., et al. 2015. "Fluvial geomorphology on Earth-like planetary surfaces: a review". Geomorphology. 245, 149–182.
  38. ↑ Carr, M. 1996. in Water on Mars. Oxford Univ. Press.
  39. ↑ Baker, V. 1982. The Channels of Mars. Univ. of Tex. Press, Austin, TX
  40. ↑ 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.
  41. ↑ Carr, M. 1979. "Formation of Martian flood features by release of water from confined aquifers". J. Geophys. Res. 84, 2995–300.
  42. ↑ 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.
  43. ↑ http://spaceref.com/mars/how-much-water-was-needed-to-carve-valleys-on-mars.html
  44. ↑ 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
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