![]() ![]() ![]() The second largest, filled impact crater and many smaller ones, appear to superpose the faults and are therefore younger. The large impact crater in the image center for example is crosscut by some grabens which means, that it was already present before the volcano was uplifted what in consequence created the faults. This gives geologists the opportunity to reconstruct the events that created this astonishing landscape. These structures were not all created at the same time, but one after the other. ![]() Throughout the image we can spot numerous graben structures running roughly from the northeast to the southwest. Alba’s graben structures are up to 1000 km long and have a width of 2-10 km with depth ranging from 100 to 350 m. The same features can also be found on the western side of Alba Patera, forming an incomplete ring around the volcano. When the extension of the crust creates two parallel faults, the rock in between the faults drops down into the void created by the extension and forms a graben. These faults are referred as grabens and the result of extensional forces associated with the uplift of the Alba Patera volcano. ![]() The Tantalus Fossae are a set of giant faults and fractures, located on the eastern side of Alba Patera in the Arcadia quadrangle. ![]()
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