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Aonia Terra - Mars Express | by jccwrt
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Aonia Terra - Mars Express

Mars Express HRSC image of Aonia Terra. This image captures the reigon northwest of the 1800 km diameter Argyre impact basin (top right). The rugged terrain around Argyre preserves evidence of the impact's violence. The mountains are chunks of crust ejected from the crater, and the deep straight valleys are faults torn open by the force of impact. The Argyre basin has thought to have formed 3.9 billion years ago, during a period known as the Late Heavy Bombardment. This time period is defined from lunar rocks, but the similar appearance of giant Mercurian and Martian craters suggest it happened across the Solar System.


This region of Aonia Terra also contains several large craters, such as Lowell Crater (203 km diameter; named after Percival Lowell), located at bottom center. The high density of craters attests to the ancient age of this region and generally quiet geological activity.


However, to the north of Aonia Terra lies the Thaumasia Rise (left). The high topography of the Thaumasia Rise is not highly visible here, but some parts of the rise stand 7-8 km above Martian "sea level" and up to 2 km above the terrain on either side. This high region marks the edge of an enormous thrust sheet pushed outwards by the weight of the Tharsis volcanoes some 3200 km NW of this region.


This image was taken during Mars Express' 15,361st orbit of Mars, February 13, 2016. It uses a combination of blue and green filter images taken by HRSC in addition to a simulated red image derived from the blue and green channel data.


Image Credit: ESA/DLR/FU Berlin/J. Cowart, CC BY-SA 3.0 IGO

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Uploaded on September 7, 2019