Astronomy:Elysium (volcanic province)

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Elysium
Elysium MOLA zoom 64.jpg
Colorized topographic map of Elysium and its surroundings, from the MOLA instrument of Mars Global Surveyor. The shield volcano Elysium Mons is at center, with the smaller volcanoes Hecates Tholus and Albor Tholus to its upper and lower right, respectively.
CoordinatesCoordinates: 24°42′N 150°00′E / 24.7°N 150.0°E / 24.7; 150.0

Elysium, located in the Elysium and Cebrenia quadrangles,[1] is the second largest volcanic region on Mars, after Tharsis.[note 1] The region includes the volcanoes (from north to south) Hecates Tholus, Elysium Mons and Albor Tholus.[2] The province is centered roughly on Elysium Mons at 24°42′N 150°00′E / 24.7°N 150°E / 24.7; 150. Elysium Planitia is a broad plain to the south of Elysium, centered at 3°00′N 154°42′E / 3.0°N 154.7°E / 3.0; 154.7.[3] Another large volcano, Apollinaris Mons, lies south of Elysium Planitia and is not part of the province. Besides having large volcanoes, Elysium has several areas with long trenches, called fossa or fossae (plural) on Mars. They include the Cerberus Fossae, Elysium Fossae, Galaxias Fossae, Hephaestus Fossae, Hyblaeus Fossae, Stygis Fossae and Zephyrus Fossae.

Composition

The southeastern portion of the province is geochemically distinct from the northwest.[4] The southeast is composed of sedimentary and porous rocks.[5] The majority of the southeastern portion is made up of Amazonian-Hesperian volcanic units. Most of the remaining southeastern volcanic units are late Amazonian in nature.[4] In recent history, there were significant groundwater deposits in the region.[6]

It has been hard to study the composition of this province, due to the layer of dust that sits on top of the crust. Investigations in relatively dust-free regions indicate that it is made primarily of high-calcium pyroxene and olivine.[7][8] To a lesser degree, the province is made up of hematite and hydrated silica, among other things.[7] There are no strong magnetic fields in the region.[8] There are some extant near-surface glacial deposits in the caldera of Hecates Tholus, a volcano in the province.[9]

Formation

The southeastern portion of the province is approximately 0.85 billion years younger than the northwestern.[4] The region as a whole has been volcanically active for at least 3.9 billion years, with a peak 2.2 billion years ago, although activity has decreased considerably in the last billion years.[10] The most recent volcanic activity dates to 2 million years ago.[5] The southeastern portion overlaps with Cerberus Fossae; features in this region are thought to have formed due to volcanic and water-related processes, such as phreatomagmatism, relict ice flows, and interactions between lava and water.[4] In general, many flow units in Elysium Planitia (such as Rahway Valles and Marte Vallis) are thought to have their origins in lava originating from this region.[11]

Hecates Tholus erupted ~350 million years ago, with glacial deposits in the resulting caldera dating between 5 and 24 million years ago.[9] Craters in the region are not generally typical of impacts; rather, they are thought to have formed due to explosive volcanism or collapse due to subsurface lava withdrawal.[2]

Observation history

The Elysium volcanic province was first noticed as a distinct martian region as a result of data obtained from the Mariner 9 mission, in the 1970s.[12][13] In 2004, ESA's Mars Express orbiter's HRSC observed the volcanoes in the region.[14][9] The InSight Lander landed just south of the province in 2018,[8] in Elysium Planitia, and has detected marsquakes emanating from this region.[15][16]

Volcanoes of Elysium

Troughs (fossae) in Elysium

See also

Notes

  1. Officially, "Elysium" is an albedo feature.[1]

References

  1. 1.0 1.1 "Elysium". Gazetteer of Planetary Nomenclature. USGS Astrogeology Science Center. http://planetarynames.wr.usgs.gov/Feature/1779. 
  2. 2.0 2.1 https://jpl.nasa.gov.+"Elysium Mons Volcanic Region" (in en). https://www.jpl.nasa.gov/images/elysium-mons-volcanic-region. 
  3. "Elysium Planitia". Gazetteer of Planetary Nomenclature. USGS Astrogeology Science Center. http://planetarynames.wr.usgs.gov/Feature/1784. 
  4. 4.0 4.1 4.2 4.3 Susko, David; Karunatillake, Suniti; Kodikara, Gayantha; Skok, J. R.; Wray, James; Heldmann, Jennifer; Cousin, Agnes; Judice, Taylor (2017-02-24). "A record of igneous evolution in Elysium, a major martian volcanic province" (in en). Scientific Reports 7 (1): 43177. doi:10.1038/srep43177. ISSN 2045-2322. PMID 28233797. Bibcode2017NatSR...743177S. 
  5. 5.0 5.1 Morgan, Gareth A.; Campbell, Bruce A.; Carter, Lynn M.; Plaut, Jeffrey J. (2015). "Evidence for the episodic erosion of the Medusae Fossae Formation preserved within the youngest volcanic province on Mars" (in en). Geophysical Research Letters 42 (18): 7336–7342. doi:10.1002/2015GL065017. ISSN 1944-8007. Bibcode2015GeoRL..42.7336M. https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1002/2015GL065017. 
  6. Burr, Devon M.; Grier, Jennifer A.; McEwen, Alfred S.; Keszthelyi, Laszlo P. (2002-09-01). "Repeated Aqueous Flooding from the Cerberus Fossae: Evidence for Very Recently Extant, Deep Groundwater on Mars" (in en). Icarus 159 (1): 53–73. doi:10.1006/icar.2002.6921. ISSN 0019-1035. Bibcode2002Icar..159...53B. https://www.sciencedirect.com/science/article/pii/S0019103502969216. 
  7. 7.0 7.1 Viviano, Christina E.; Murchie, Scott L.; Daubar, Ingrid J.; Morgan, M. Frank; Seelos, Frank P.; Plescia, Jeffrey B. (2019-08-01). "Composition of Amazonian volcanic materials in Tharsis and Elysium, Mars, from MRO/CRISM reflectance spectra" (in en). Icarus 328: 274–286. doi:10.1016/j.icarus.2019.03.001. ISSN 0019-1035. Bibcode2019Icar..328..274V. https://www.sciencedirect.com/science/article/pii/S0019103518303853. 
  8. 8.0 8.1 8.2 Pan, Lu; Quantin-Nataf, Cathy; Tauzin, Benoit; Michaut, Chloé; Golombek, Matt; Lognonné, Phillipe; Grindrod, Peter; Langlais, Benoit et al. (2020-03-01). "Crust stratigraphy and heterogeneities of the first kilometers at the dichotomy boundary in western Elysium Planitia and implications for InSight lander" (in en). Icarus 338: 113511. doi:10.1016/j.icarus.2019.113511. ISSN 0019-1035. Bibcode2020Icar..33813511P. https://www.sciencedirect.com/science/article/pii/S0019103519303653. 
  9. 9.0 9.1 9.2 Hauber, Ernst; van Gasselt, Stephan; Ivanov, Boris; Werner, Stephanie; Head, James W.; Neukum, Gerhard; Jaumann, Ralf; Greeley, Ronald et al. (March 2005). "Discovery of a flank caldera and very young glacial activity at Hecates Tholus, Mars" (in en). Nature 434 (7031): 356–361. doi:10.1038/nature03423. ISSN 1476-4687. PMID 15772654. Bibcode2005Natur.434..356H. https://www.nature.com/articles/nature03423. 
  10. Platz, Thomas; Michael, Gregory (2011-12-01). "Eruption history of the Elysium Volcanic Province, Mars" (in en). Earth and Planetary Science Letters 312 (1): 140–151. doi:10.1016/j.epsl.2011.10.001. ISSN 0012-821X. Bibcode2011E&PSL.312..140P. https://www.sciencedirect.com/science/article/pii/S0012821X11005887. 
  11. Voigt, Joana R. C.; Hamilton, Christopher W. (2018-07-15). "Investigating the volcanic versus aqueous origin of the surficial deposits in Eastern Elysium Planitia, Mars" (in en). Icarus 309: 389–410. doi:10.1016/j.icarus.2018.03.009. ISSN 0019-1035. Bibcode2018Icar..309..389V. https://www.sciencedirect.com/science/article/pii/S001910351730831X. 
  12. Williams, David A.; Greeley, Ronald; Manfredi, Leon; Raitala, Jouko; Neukum, Gerhard (2010-06-01). "The Circum-Hellas Volcanic Province, Mars: Assessment of wrinkle-ridged plains" (in en). Earth and Planetary Science Letters. Mars Express after 6 Years in Orbit: Mars Geology from Three-Dimensional Mapping by the High Resolution Stereo Camera (HRSC) Experiment 294 (3): 492–505. doi:10.1016/j.epsl.2009.10.007. ISSN 0012-821X. Bibcode2010E&PSL.294..492W. https://www.sciencedirect.com/science/article/pii/S0012821X09006062. 
  13. McCauley, J. F.; Carr, M. H.; Cutts, J. A.; Hartmann, W. K.; Masursky, Harold; Milton, D. J.; Sharp, R. P.; Wilhelms, D. E. (1972-10-01). "Preliminary mariner 9 report on the geology of Mars" (in en). Icarus 17 (2): 289–327. doi:10.1016/0019-1035(72)90003-6. ISSN 0019-1035. https://dx.doi.org/10.1016%2F0019-1035%2872%2990003-6. 
  14. "HRSC Bildserie #011 - Albor Tholus (Mars Express Orbit 0032); Fachrichtung Planetologie und Fernerkundung an der FU Berlin". http://www.planet.geo.fu-berlin.de/projekte/mars/hrsc011-AlborTholus.php. 
  15. Horvath, David G.; Moitra, Pranabendu; Hamilton, Christopher W.; Craddock, Robert A.; Andrews-Hanna, Jeffrey C. (2020-11-11). "Evidence for geologically recent explosive volcanism in Elysium Planitia, Mars". arXiv:2011.05956 [astro-ph.EP].
  16. Lognonné, P.; Banerdt, W. B.; Giardini, D.; Pike, W. T.; Christensen, U.; Laudet, P.; de Raucourt, S.; Zweifel, P. et al. (2019-01-28). "SEIS: Insight's Seismic Experiment for Internal Structure of Mars" (in en). Space Science Reviews 215 (1): 12. doi:10.1007/s11214-018-0574-6. ISSN 1572-9672. PMID 30880848. Bibcode2019SSRv..215...12L. 

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