Elysium Mons
{{short description|Martian volcano}}
{{About|the volcano on Mars|other uses|Elysium (disambiguation)}}
{{Infobox feature on celestial object
|name = Elysium Mons
|image = 200px
|caption = 2001 Mars Odyssey THEMIS daytime infrared image mosaic
|coordinates = {{coord|25.02|N|147.21|E|globe:mars_type:landmark|display=inline,title}}
|coordinates_footnotes = {{gpn|1783|Elysium Mons}}
|peak = *{{convert|12.6|km|abbr=on}} {{cvt|41338|ft|abbr=on}} above plains
- {{convert|16|km|ft}} above datum
|discoverer = Mariner 9
|type = Shield volcano
}}
Elysium Mons {{IPAc-en|ᵻ|ˈ|l|ɪ|z|i|ə|m|_|ˈ|m|ɒ|n|z}} is a volcano on Mars located in the volcanic province Elysium, at {{Coord|25.02|N|147.21|E|globe:Mars_type:mountain_source:gpn}}, in the Martian eastern hemisphere. It stands about {{convert|12.6|km|ft|abbr=on}} above its base,{{cite journal|last1=Plescia|first1=J. B.|title=Morphometric properties of Martian volcanoes|journal=Journal of Geophysical Research|volume=109|issue=E3|pages=E03003|date=2004|issn=0148-0227|doi=10.1029/2002JE002031|bibcode = 2004JGRE..109.3003P |doi-access=free}} and about {{convert|14.1|km|ft|abbr=on}} above the Martian datum, making it the third tallest Martian mountain in terms of relief and the fourth highest in elevation. Its diameter is about {{convert|240|km|mi|abbr=on}}, with a summit caldera about {{convert|14|km|mi|abbr=on}} across. It is flanked by the smaller volcanoes Hecates Tholus to the northeast, and Albor Tholus to the southeast.
Discovery
Elysium Mons was discovered in 1972 in images returned by the Mariner 9 orbiter.
Terrestrial analog
The terrestrial volcano Emi Koussi (in Chad) has been studied as an analog of Elysium Mons. The two shield volcanoes have summit calderas of similar size, but Elysium Mons is 3.5 times larger in diameter and 6 times higher than its counterpart on Earth.
Possible source of nakhlites
A 6.5 km diameter crater at 29.674 N, 130.799 E, in the volcanic plains to the northwest of Elysium Mons has been identified as a possible source for the nakhlite meteorites, a family of similar basaltic Martian meteorites with cosmogenic ages of about 10.7 Ma, suggesting ejection from Mars by a single impact event. The dates of the igneous rocks of the nakhlites range from 1416 ± 7 Ma to 1322 ± 10 Ma. These dates plus the crater dimensions suggest a growth rate of the source volcano during that interval of 0.4–0.7 m per Ma, far slower than would be expected for a terrestrial volcano. This implies that Martian volcanism had slowed greatly by that point in history.{{cite journal|last1= Cohen|first1=B. E.|last2= Mark|first2=D. F.|last3= Cassata|first3=W. S.|last4= Lee|first4=M. R.|last5= Tomkinson|first5= T.|last6= Smith|first6=C. L.|title= Taking the pulse of Mars via dating of a plume-fed volcano|journal= Nature Communications|volume= 8|issue= 1|year= 2017|page=640|doi= 10.1038/s41467-017-00513-8|bibcode=2017NatCo...8..640C|pmc= 5626741|pmid= 28974682}}
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Gallery
Elysium Mons 541A44 541A46.jpg|Viking Orbiter 1 mosaic (1977)
MOLA elysium mons.jpg|Topography of the Elysium Mons area, from MOLA
Elysium Mons.gif|Mars Global Surveyor view of the summit area
Elysium Mons Caldera.JPG|Rim of Elysium Mons caldera, as seen by HiRISE
See also
References
{{Reflist}}
External links
{{Commons category|Elysium Mons}}
- [http://www.google.com/mars/#lat=21.371244&lon=158.115234&zoom=4&q=Elysium%20Mons Google Mars] - zoomable map centered on Elysium Mons
- [http://www.msss.com/mars_images/moc/7_10_98_elysium_rel/ "Elysium Mons Volcano"] - NASA images of Elysium Mons, from Malin Space Science Systems
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