Mars Express sees deep fractures on Mars

May 06, 2011
Nili Fossae is a graben system on Mars. It is found at 22°N / 77°E, northeast of the Syrtis Major volcanic province, on the northwestern edge of the giant Isidis impact basin. This image shows an area covering approximately 10,300 sq km. It was taken during orbit 5270, on Feb. 8, 2008, using the High-Resolution Stereo Camera on Mars Express. Credit: ESA/DLR/FU Berlin (G. Neukum)

Newly released images from ESA's Mars Express show Nili Fossae, a system of deep fractures around the giant Isidis impact basin. Some of these incisions into the martian crust are up to 500 m deep and probably formed at the same time as the basin.

Nili Fossae is a 'graben' system on Mars, northeast of the Syrtis Major volcanic province, on the northwestern edge of the giant Isidis impact basin. Graben refers to the lowered terrain between two parallel faults or fractures in the rocks that collapses when pull the area apart. The Nili Fossae system contains numerous graben concentrically oriented around the edges of the basin.

It is thought that flooding of the basin with basaltic lava after the impact that created it resulted in subsidence of the basin floor, adding stress to the planet's crust, which was released by the formation of the fractures.

A strongly eroded is visible to the bottom right of the image. It measures about 12 km across and exhibits an ejecta blanket, usually formed by material thrown out during the impact. Two have taken place to the west of the crater. Whether they were a direct result of the impact or occurred later is unknown.

A smaller crater, measuring only 3.5 km across, can be seen to the left of centre in the image and this one does not exhibit any ejecta blanket material. It has either been eroded or may have been buried.

The surface material to the top left of the image is much darker than the rest of the area. It is most likely formed of basaltic rock or originating from the Syrtis Major region. Such lava blankets form when large amounts of low-viscosity basaltic magma flow across long distances before cooling and solidifying. On Earth, the same phenomenon can be seen in the Deccan Traps in India.

Nili Fossae interests planetary scientists because observations taken with telescopes on the Earth and published in 2009 have shown that there is a significant enhancement in Mars' atmospheric methane over this area, suggesting that methane may be being produced there. Its origin remains mysterious, however, and could be geological or perhaps even biological.

As a result, understanding the origin of methane on Mars is high on the priority list and in 2016, ESA and NASA plan to launch the ExoMars Trace Gas Orbiter to investigate further. Nili Fossae will be observed with great interest.

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User comments : 7

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Na_Reth
5 / 5 (1) May 06, 2011
Does it look photoshopped or are the europeans really good at taking pictures and using good cameras? :D
LKD
not rated yet May 06, 2011
Is there a reason for the white-ish tinge to the base of the incisions? They seem curious in their coloring.
Na_Reth
not rated yet May 06, 2011
It could just be reflected sunlight, dear LKD.
LuckyBrandon
not rated yet May 06, 2011
i doubt sunlight reflects very birhglty on mars by comparison to earth...aka, you might see shimmering from the water on earth, but the sun also has significantly more impact on our planet than it does mars. im not saying its not reflected sun, but thats impressive if it is (both from the sun and picture standpoint)
emsquared
5 / 5 (1) May 06, 2011
Maybe there was some contrast and saturation adjustments done to the original picture, that could bring out highlights that aren't "actually" there, or rather not actually so prominent.
Zenmaster
not rated yet May 07, 2011
@Na_Reth - read the paper "The imaging performance of the SRC on Mars Express". The images have the surreal quality due to the need for special processing methods used to compensate for imaging-hardware defects. The images are 'good', in that there is a lot of useful information present. But they do tend to have a synthetic quality. Not sure if you meant that the artificial appearance was what made them 'good'.
rwinners
not rated yet May 08, 2011
Looks like Utah.

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