PIA03990: Ganges Chasma Sands
 Target Name:  Mars
 Is a satellite of:  Sol (our sun)
 Mission:  Mars Global Surveyor (MGS)
 Spacecraft:  Mars Global Surveyor Orbiter
 Instrument:  Mars Orbiter Camera (MOC)
 Product Size:  836 x 1582 pixels (w x h)
 Produced By:  Malin Space Science Systems
 Producer ID:  MOC2-1146
 Full-Res TIFF:  PIA03990.tif (1.324 MB)
 Full-Res JPEG:  PIA03990.jpg (140 kB)

Click on the image above to download a moderately sized image in JPEG format (possibly reduced in size from original)

Original Caption Released with Image:

8 July 2005
This Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) image shows dark, windblown sand in the form of dunes and a broad, relatively flat, sand sheet in Ganges Chasma, part of the eastern Valles Marineris trough complex. The winds responsible for these dunes blew largely from the north. Sand dunes on Mars, unlike their Earthly counterparts, are usually dark in tone. This is a reflection of their composition, which includes minerals that are more rich in iron and magnesium than the common silica-rich dunes of Earth. Similar dark sands on Earth are found in volcanic regions such as Iceland and Hawaii. A large dune field of iron/magnesium-rich grains, in the form fragments of the volcanic rock, basalt, occurs south of Moses Lake, Washington, in the U.S.

Location near: 7.7S, 45.3W
Image width: ~3 km (~1.9 mi)
Illumination from: lower left
Season: Southern Spring

Image Credit:
NASA/JPL/Malin Space Science Systems

Image Addition Date:
2005-07-08