 Mangala Fossa and Mangala Valles (THEMIS image) | |
| Coordinates | 11°36′S151°00′W / 11.6°S 151.0°W /-11.6; -151.0 |
|---|---|
| Length | 828.0 km |
Mangala Fossa is agraben in theMemnonia quadrangle ofMars, located near11°36′S151°00′W / 11.6°S 151.0°W /-11.6; -151.0, which originated in theHesperian and Amazonian epochs. The graben is located at the head of theoutflow channelMangala Valles, which is thought to have been formed by at least two catastrophic flood events during the same geological period, leading to the release of vast quantities of water from Mangala Fossa onto the Martian surface. The flooding was probably initiated by the emplacement of a dike radiating from the volcanoArsia Mons, resulting in the formation of the graben, Mangala Fossa, at the channels' head. This dike breached a pressurizedaquifer trapped beneath a thick "cryosphere" (layer of frozen ground) beneath the surface. As the floor of the graben subsided, water found its way up one or both of the faults in the crust that defined the edges of the graben and spilled into the depression, eventually filling it and overflowing at the lowest point on the rim to erode the Mangala Valles channels.[1][2][3][4][5][6][7]
"Mangala" is the name forMars inJyotish (or Hindu) astrology.
