Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996dps....28.1502r&link_type=abstract
American Astronomical Society, DPS meeting #28, #15.02; Bulletin of the American Astronomical Society, Vol. 28, p.1119
Astronomy and Astrophysics
Astronomy
Scientific paper
Meshkenet Tessera is a 1600 km long and 50 to 340 km wide tessera highland located between Ishtar Terra and coronae of the Nightingale group. It provides evidence of large-scale crustal movements. Its complex tectonic structures have various deformation geometries, thus indicating different tectonic sequences. The main parallel faults, first explained as rotational bookshelf faults, are more likely due to relative dextral direct shear movements of rectangular blocks which now have an en echelon configuration. These faults have been active, possibly due to endogenic stresses, as indicated by mid-size ridges which connect them to adjoining tectonic units. The deformation within the Meshkenet Tessera blocks has mostly been extensional, mostly due to responses of the uppermost surface bedrock to tensional stresses. It is found that complex deformation structures within blocks have certain aspects similar to a chocolate tablet boudinage which has been active after the original parallel faulting and bar-like crustal block formation. The high-angle tessera structures with varying cross-cutting relations define styles and locations of multiphase deformation most evidently related to local relaxation of tessera topography. Series of progressive or superposed fracturing events with alternating fault directions took place at high angles during this relaxational tessera deformation.There are also some compressional ridge belts around Meshkenet Tessera indicating the existence of compression against surrounding lowland areas.
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