Apennine Bench Formation
Taken by Raffaello Lena on April 23, 2018 @
Rome Italy
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Date Taken: 2018:04:25 16:16:04
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Details:
On April 23 i made an image of Archimedes and the south Apennine Bench Formation under strongly oblique solar illumination. The stratigraphy of this area has been extensively studied and it is known that the impact which created Archimedes occurred after the Imbrium basin impact (3.9 to 3.8 billion years ago) but before the flooding of the basin by dark mare lavas (3.84 to 3.1 billion years ago). The lighter lava plain of the ABF is older than Archimedes and was formed by pre-mare highlands group volcanism. These plains are notable for their roughness and tectonic features (grabens). A volcanic origin for ABF is suggested by the presence of domes on the bench (detectable on the image) and the finding of appropriate types of volcanic rock in the Apollo 15 specimen collection. The Apennine Bench formation is the only known large surface expression of rocks with a KREEP basalt composition. In this image note the western part of the bench is elevated relative to the adjacent mare by an average of about 500 m. Thus i can argue it is a sort of megadome extending for 120 km.
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