Tectonic implications for the gravity structure of Caloris Basin,Mercury |
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| Authors: | HJ Melosh D Dzurisin |
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| Institution: | Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California 91125, USA |
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| Abstract: | Studies of tectonic landforms associated with Caloris Basin on Mercury suggest that isostatic adjustment has occurred in response to basin excavation, and that the smooth plains inside Caloris were emplaced significantly before isostatic equilibrium was attained. Combined with dynamical considerations, this leads us to propose that the Caloris region is characterized by a circular negative or zero free air gravity anomaly centered inside Caloris, and an annular positive anomaly which coincides with extensive tracts of young smooth plains outside the basin. This proposed gravity pattern differs markedly from that associated with mare-filled basins on the Moon. |
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