Concentric Structural Zones and Lithology of Distributed Impact Rocks

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Guest Editor
Dr. Victor Masaitis
A.P.Karpinsky Russian Geological Research Institute, Russia
Thomas Fauchez
NASA Goddard Space Flight Center,USA

Manuscript Topics
Collision of small cosmic bodies on the surfaces of solid planets and asteroids create a circular depression and structural deformations (1), allochtonous accumulations of transformed rocks (2), and reflecting both of them topographic features (3). These circle-shaped objects possess central symmetry and usually called impact craters, though on the Earth the ancient craters are often strongly eroded or buried under post-impact sediments. In the named crater’s constituents may be distinguished concentric zonality of distribution of lithologies, minor structural forms, and relief features, which change gradually as the distance from impact point increase. The similar changes exist in vertical sections of deformed target rocks, crater fill and fallout ejecta. They characterize also by some tangential variations in lithology and inner structure between the near-by radial rays. On the whole, the 3-D structural and lithological zonality and zonality of surface topography formed by influence of different mechanisms of impact cratering and target properties may be revealed in most impact craters, and their description is the topic of planned issue.

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