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Martian Labyrinth

By R&D Editors | January 28, 2016

This perspective view in Noctis Labyrinthus was generated from the main camera’s stereo channels on ESA’s Mars Express. It shows the beautiful details of landslides in the steep-sided walls of the flat-topped graben in the foreground, and in the valley walls in the background. The scene is part of region imaged by the High Resolution Stereo Camera on Mars Express during orbit 14632. The image is centered on 6°S / 265°E; the ground resolution is about 16 meters per pixel. Courtesy of ESA/DLR/FU Berlin, CC BY-SA 3.0 IGO -- Click to enlargeThis block of Martian terrain, etched with an intricate pattern of landslides and wind-blown dunes, is a small segment of a vast labyrinth of valleys, fractures and plateaus.

The region, known as Noctis Labyrinthus — the “labyrinth of the night” — lies on the western edge of Valles Marineris, the Grand Canyon of the Solar System. It was imaged by ESA’s Mars Express on July 15, 2015.

It is part of a complex feature whose origin lies in the swelling of the crust owing to tectonic and volcanic activity in the Tharsis region, home to Olympus Mons and other large volcanoes.

As the crust bulged in the Tharsis province, it stretched apart the surrounding terrain, ripping fractures several kilometers deep and leaving blocks — graben — stranded within the resulting trenches.

The entire network of graben and fractures spans some 1,200 kilometers, about the equivalent length of the river Rhine from the Alps to the North Sea.

The segment presented here captures a roughly 120-kilometer-wide portion of that network, with one large, flat-topped block taking center stage.

Landslides are seen in extraordinary detail in the flanks of this unit and along the valley walls (most notable in the perspective view, top), with eroded debris lying at the base of the steep walls.

In some places, particularly notable in the lower-right corner of the plan view image (above), wind has drawn the dust into dune fields that extend up onto the surrounding plateaus.

Near-linear features are also visible on the flat elevated surfaces: fault lines crossing each other in different directions, suggesting many episodes of tectonic stretching in the complex history of this region.

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