Anomalous structure of the Crust and Mantle of Marsстатья
Информация о цитировании статьи получена из
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Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:This study determined the contribution of Martian topography and the density jump at the
Mohorovicic discontinuity (M) to the gravity in a quadratic approximation. It also resolved the problem of
determining the possible depths of compensation for topography harmonics of various degrees and orders. It
shows that all the topography compensation is within the depth range from 0 to 1400 km. Different topo
graphic irregularities are most likely to be compensated at depths that correspond to the upper crust ( =
4.5 ± 3.7 km), crust–mantle transition layer ( = 78 ± 24 km), lithospheric boundary ( = 200 ± 34 km),
uppermiddle mantle transition layer ( = 400 ± 70 km), or middlelower mantle transition layer ( = 1120 ±
180 km). This paper presents the lateral distributions of compensation masses for these depths and the respec
tive maps. According to calculations, stresses in the Martian crust and mantle may be as high as 108 Pa. This
paper shows that the topographic anomalies of the Tharsis volcanic plateau and the symmetric formation in
the eastern hemisphere could have originated and be dynamically maintained by two plumes of melted mantle
substance enriched with fluids; these plumes may have their origin at the boundary of the lower mantle.