Mommur Chasma is the largest '
canyon' on the known part of the surface of
Uranus' moon
Oberon.[1] This feature probably formed during crustal extension at the early stages of moon's evolution, when the interior of Oberon expanded and its ice
crust cracked as a result.[2] The canyon is an example of
graben (
rift valley) or
scarp produced by
normal fault(s). The chasma was first imaged by
Voyager 2 spacecraft in January 1986.[3]
^
abUSGS/
IAU (October 1, 2006).
"Mommur Chasma on Oberon". Gazetteer of Planetary Nomenclature. USGS Astrogeology. Retrieved 2012-03-28.
^
Croft, S.K. (March 1989). New Geologic Maps of the Uranian Satellites Titania, Oberon, Umbriel and Miranda. Proceeding of Lunar and Planetary Sciences. Vol. 20. Lunar and Planetary Sciences Institute, Houston. p. 205C.
Bibcode:
1989LPI....20..205C.