Astronomy:North Polar Basin (Mars)

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Short description: Large basin in the northern hemisphere of Mars
Borealis Basin
Mars topography (MOLA dataset) with poles HiRes.jpg
The Borealis Basin is the large blue and green region lying north of the equator. Volcanic eruptions on the Tharsis bulge, the higher elevation region on the left of the image, covered over parts of the basin after its formation.
LocationNorthern Hemisphere, Mars
Coordinates [ ⚑ ] : 67°N 208°E / 67°N 208°E / 67; 208

The North Polar Basin, more commonly known as the Borealis Basin, is a large basin in the northern hemisphere of Mars that covers 40% of the planet.[1][2] Some scientists have postulated that the basin formed during the impact of a single, large body roughly 2% of the mass of Mars, having a diameter of about 1,900 km (1,200 miles) early in the history of Mars, around 4.5 billion years ago.[1][3] However, the basin is not currently recognized as an impact basin by the IAU. The basin is one of the flattest areas in the Solar System, and has an elliptical shape.[1][2]

Large regions within the Borealis Basin

Because the Borealis basin covers 40% of the surface of Mars, and much of the Northern Hemisphere, many currently recognized regions of Mars lie within it:[2]

Borealis Impact

Formation of the Borealis Basin

One possible explanation for the basin's low, flat and relatively crater-free topography is that the basin was formed by a single large impact. Two simulations of a possible impact sketched a profile for the collision: low velocity—6 to 10 km (3.7 to 6.2 mi) per second—oblique angle and a diameter of 1,600–2,700 km (990–1,680 mi).[3][4] Topographical data from Mars Global Surveyor are consistent with the models and also suggest that the elliptical crater has axes of length 10,600 km (6,600 mi) and 8,500 km (5,300 mi), centered on [ ⚑ ] 67°N 208°E / 67°N 208°E / 67; 208, though this has been partially obscured by later volcanic eruptions that created the Tharsis bulge along its rim.[2] There is evidence for a secondary rim as well.[2][5] This would make the North Polar Basin by far the largest impact crater in the Solar System, approximately four times the diameter of the next largest craters: Utopia Planitia, which is imbedded inside the North Polar Basin, the South Pole–Aitken basin on the Moon, and Hellas Planitia on Mars's southern hemisphere.[6]

This impact would have resulted in significant crustal melting and a general increase in the rate of crustal formation for a period of 40 million years following the impact.[7] Such a large impact would have disturbed the mantle, altering the normal convection currents and causing upwellings which further increase the amount of melting at the impact site.[7] Overall, such an event would actually increase the rate of cooling of the Martian interior.[7] The lack of magnetic anomalies observed in the northern hemisphere could be explained by such an impact, as the shock waves produced might have demagnetized the crust.[7]

Potential formation of Phobos and Deimos via Borealis impact

The moons of Mars: Phobos and Deimos. Phobos is the larger of the two moons, and is the closer of the two to Mars. Phobos has an average radius of 11 km, while Deimos has an average radius of 6 km.

The origin of Mars' moons, Phobos and Deimos (pictured right), is unknown and remains controversial. One theory is that the moons are captured asteroids. However, the moons' near circular orbits and low inclination relative to the Martian equator are not in agreement with the capture hypothesis.[8] The detection of minerals on Phobos similar to those in the Martian lithosphere, and the unusually low density and high porosity of Phobos, such that the moon would not be expected to remain aggregate if dynamically captured, suggest that the moons could have formed via accretion in Martian orbit, similar to how Earth's Moon formed.[8]

While estimates of the mass ejected by a large, Borealis-size impact vary, simulations suggest that a body approximately 0.02 Mars masses (~0.002 Earth Masses) in size is capable of producing a sizable debris disk in Martian orbit, on the order of 5×1020 kg, with a significant fraction of the material remaining close to Mars.[3][8] This figure lies within the estimated mass range necessary to form the two moons, as other data suggests that only 1% of the mass of an accretion disk successfully forms moons.[8] There are several other large impact basins on Mars that could have ejected enough debris to form the moons.[8]

Ancient tsunamis

Lomonosov crater, the most likely candidate for the impact that produced the tsunami. It is 150 km in diameter, and is a prominent feature of the Borealis basin.

Analysis of Mars Global Surveyor data found mineral deposits similar to terminal moraines on Earth along the southern rim of the northern lowlands. Scientists have developed several theories to explain their presence, including: volcanic activity, glacial activity, and a series of Martian tsunamis.[9] The arrangement of the deposits resembles deposits observed in recent tsunami events on Earth, and other features of the deposits are inconsistent with the volcanic and glacial hypotheses.[9] One recent investigation identified three impact craters in Acidalia Planitia as being the likely source of the hypothetical tsunamis, with the Lomonosov crater (pictured right) being the most likely candidate.[9] Here, the tsunami generated by the impactor would have reached heights of 75 m (250 ft), and traveled 150 km (90 mi) past the southern rim.[9] Dating techniques put the origin of the deposits sometime between the Late Hesperian and Early Amazonian periods, some 3 billion years ago, providing evidence to the presence of an ocean during this period.[9]

See also

References

  1. ↑ 1.0 1.1 1.2 "NASA - NASA Spacecraft Reveal Largest Crater in Solar System" (in en). https://www.nasa.gov/home/hqnews/2008/jun/HQ_08159_Mars_crater.html. 
  2. ↑ 2.0 2.1 2.2 2.3 2.4 Andrews-Hanna et al. (2008). "The Borealis basin and the origin of the Martian crustal dichotomy". Nature 453 (7199): 1212–1215. doi:10.1038/nature07011. PMID 18580944. Bibcode: 2008Natur.453.1212A. 
  3. ↑ 3.0 3.1 3.2 Marinova et al. (2008). "Mega-impact formation of the Mars hemispheric dichotomy". Nature 453 (7199): 1216–1219. doi:10.1038/nature07070. PMID 18580945. Bibcode: 2008Natur.453.1216M. 
  4. ↑ Nimmo et al. (2008). "Implications of an impact origin for the Martian hemispheric dichotomy". Nature 453 (7199): 1220–1223. doi:10.1038/nature07025. PMID 18580946. Bibcode: 2008Natur.453.1220N. 
  5. ↑ "Huge Impact Created Mars' Split Personality". Space.com. http://www.space.com/scienceastronomy/080625-mars-impact.html. 
  6. ↑ Chandler, David (2008-06-25). "Solar system's biggest impact scar discovered: MIT scientists solve riddle of Mars' two-faced nature". MIT News. http://newsoffice.mit.edu/2008/solar-systems-biggest-impact-scar-discovered. 
  7. ↑ 7.0 7.1 7.2 7.3 Ghods, Abdolreza; Arkani-Hamed, Jafar (2011-09-01). "Effects of the Borealis impact on the mantle dynamics of Mars". Physics of the Earth and Planetary Interiors 188 (1–2): 37–46. doi:10.1016/j.pepi.2011.06.010. Bibcode: 2011PEPI..188...37G. 
  8. ↑ 8.0 8.1 8.2 8.3 8.4 Citron, Robert I.; Genda, Hidenori; Ida, Shigeru (2015-05-15). "Formation of Phobos and Deimos via a giant impact". Icarus 252: 334–338. doi:10.1016/j.icarus.2015.02.011. Bibcode: 2015Icar..252..334C. 
  9. ↑ 9.0 9.1 9.2 9.3 9.4 Costard, Francois; Séjourné, Antoine; Kelfoun, Karim; Clifford, Stephen; Lavigne, Franck; Di Pietro, Ilaria; Bouley, Sylvain (2017-01-01). "Modeling tsunami propagation and the emplacement of thumbprint terrain in an early Mars ocean" (in en). Journal of Geophysical Research: Planets 122 (3): 2016JE005230. doi:10.1002/2016JE005230. ISSN 2169-9100. Bibcode: 2017JGRE..122..633C. https://hal.archives-ouvertes.fr/hal-01520508/file/JGR%20Planets%20-%202017%20-%20Costard%20-%20Modeling%20tsunami%20propagation%20and%20the%20emplacement%20of%20thumbprint%20terrain%20in%20an%20early%20Mars.pdf. 



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