Influence of a variable thermal conductivity on the thermochemical evolution of Mars

摘要: [1] The influences of variations in thermal conductivity due to composition, temperature, and pressure mantle crust on the thermochemical evolution Mars have been examined with parameterized convection models. We use a temperature- pressure-dependent column-averaged values between 1.5 4 Wm−1K−1 for (with 2 as representative value basaltic crust). The major characteristic models is slower cooling upper long-existing global partial melt zone stronger crustal production late compared earlier which assume constant Wm−1K−1. To explain observed thickness early formation Mars, an enriched primordial required. Recent volcanism can be explained by lateral temperature that are caused low conducting crust. These zones occur underneath thicker than average may source region longstanding Tharsis Elysium instead plumes rising from core-mantle boundary. elastic lithosphere characterized transition at strength first provided later also mantle. This finding estimated less 16 km Noachian more 100 Hesperian Amazonian.