On the spatial variability of the Martian Elastic Lithosphere Thickness: Evidence for Mantle Plumes?

摘要: [1] The present day elastic lithosphere thickness at the Martian north pole has recently been constrained to De > 300 km and this is a factor of 3–4 larger than estimates for other Amazonian surface features like Tharsis volcanoes. Here we model which takes locally varying crustal thickness, local concentration heat-producing elements, as well variations strain rate into account. The predicts = 196 today, whereas thicknesses volcanoes are best compatible with middle late loading ages. Therefore, although large degree spatial heterogeneity can be explained by presented model, in excess cannot reproduced. In order fit all derived from observations, mantle heat flux needs reduced 35%. However, only reconciled bulk chondritic elements interior if deposited elsewhere. argues presence active plumes, possibly underneath Tharsis. size strength such plume Montes maximum average between 8 24 mW m-2, corresponding central peak 40 120 m−2, consistent observations. Such would leave clear signature should readily detectable situ measurements.