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This community of lengthy grooves and scratches types a part of a large fault system on Mars known as Tantalus Fossae, and is shown here as seen by the European Space Agency’s Mars Express.
At first glance, these features appear to be the result of someone raking their fingernails, or claws, across the surface of the Red Planet, gouging out long trenches in the process.
While not quite so dramatic in its formation, Tantalus Fossae (‘fossae’ meaning a hollow or depression) is a noticeable feature on Mars. This system of troughs flanks a sprawling, low-relief martian volcano named Alba Mons, running along the volcano’s eastern side.
The fossae were created as the summit of Alba Mons rose in elevation, causing the surrounding surface to become warped, extended, and broken. The Tantalus Fossae faults are a great example of a surface feature known as grabens; each trench formed as two parallel faults opened up, causing the rock between to drop down into the resulting void.
The same features can be found on the western side of Alba Mons, forming an incomplete ring around the volcano. Overall, this volcano’s associated grabens stretch out for up to 1000 km (620 miles) in length, up to 10 km (6.2 miles) in width, and are up to 350 m (1,150 feet) deep.
A complex history
Throughout this Mars Express image, numerous grabens can be seen running roughly northeast (bottom-right) to southwest (top-left).
These structures are thought to have formed not at the same time but one after the other, providing scientists the opportunity to reconstruct a past timeline and picture of what created this dramatic landscape.
The large impact crater at the center of the image, for example, is crosscut by grabens, indicating that it was already present before the volcano was uplifted to create the Tantalus Fossae faults. The second-largest impact crater (far smaller and to the bottom-left of the central crater) appears to superpose the faults, and is therefore likely to be younger.
Upon closer look, many small, branching valleys can be seen across this region. These valleys appear to cut directly through the grabens, and so are assumed to be older.
As shown most clearly in the associated topographic view, the northern (right) part contains far lower terrain than the southern (left) part – in places, as much as three kilometers lower in altitude. We would expect any small, branching valleys to run along the slopes of Alba Mons and merge where the ground is lowest, but this is not seen here, implying that the valleys must originate from more ancient times – before Alba Mons rose to sculpt this terrain into what we see today.
This area is named after Tantalus, a son of Zeus and Plouto (Pluto) who, according to Greek legend, betrayed the gods and was forced by Hades to stand in water beneath a fruit tree. When he tried to drink the water retreated, and when he tried to eat the branches moved beyond his reach – a punishment known as the torments of Tantalus.
Mars Express has been orbiting the Red Planet since 2003, imaging Mars’ surface, mapping its minerals, identifying the composition and circulation of its tenuous atmosphere, probing beneath its crust, and exploring how various phenomena interact in the martian environment.
The mission’s High Resolution Stereo Camera (HRSC), responsible for these new images, has revealed much about Mars’ diverse surface features, with recent images showing everything from brain terrain and wind-sculpted ridges and grooves to volcanoes, impact craters, tectonic faults, river channels, and ancient lava pools.
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