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January-February GSA Bulletin media highlights
Date:1/12/2009

adial limit. A reconstruction of the ice surface indicates that the Irish Ice Sheet reached a maximum surface elevation of about 500 m over the central Irish Lowlands during the Killard Point stadial, suggesting a high sensitivity of the ice sheet to small changes in climate.


Continental-scale salt tectonics on Mars and the origin of Valles Marineris and associated outflow channels

David R. Montgomery et al., Quaternary Research Center, Department of Earth and Space Sciences, University of Washington, Seattle, Washington 98195-1310, USA. Pages 117-133.

A synthesis of deformation patterns within and around the Thaumasia Plateau, Mars, points to a new interpretation for regional deformation and the origin of Valles Marineris and associated outflow channels. Montgomery et al. state that geothermal heating and topographic loading of extensive buried deposits of salts and/or mixtures of salts, ice, and basaltic debris would allow for weak detachments and large-scale gravity spreading. They propose that the generally linear chasmata of Valles Marineris reflect extension, collapse, and excavation along fractures radial to Tharsis, either forming or reactivated as part of one lateral margin of the Thaumasia gravity-spreading system. The other, dextral, lateral margin is a massive splay of extensional faults forming the Claritas Fossae, which resembles a trailing extensional imbricate fan. Topographic observations and previous structural analyses reveal evidence for a failed volcanic plume below Syria Planum that could have provided both thermal energy and topographic potential for initiating regional deformation, either intrusively through inflation or extrusively through lava flow and/or ash fall emplacement. Higher heat flow during Noachian time, or geothermal heating due to burial by Tharsis-derived volcanics, would have contributed to flow of salt deposits, as well as formation of groundwater from melting ice and dewatering o
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Contact: Christa Stratton
cstratton@geosociety.org
303-357-1093
Geological Society of America
Source:Eurekalert

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