http://arxiv.org/abs/2210.05428
Lithosphere is the outer rigid part of terrestrial body, usually consisting of the crust and part of the mantle. Characterizing the physical properties of lithosphere is critical in the investigation to its evolution history. Through the modeling of mass-related loads within lithosphere, physical parameters such as elastic thickness of lithosphere can be inferred by gravity and topography data. At impact basin region, however, the low correlation between topography and gravity makes this model inapplicable. In this work, we proposed a loading model incorporated with the mantle uplift structure commonly formed at impact basin. The resulting deflection caused by this mantle uplift structure is also modeled in the governing equation of the thin elastic shell. Gravity anomaly of the deflected lithosphere is calculated at the surface and the crustal-mantle boundary, then the theoretical gravity admittance and correlation can be compared with observed data. The application of the mantle loading model at four large impact basins on Mars show better fit to the observed admittance and correlation compared with loading model that without this initial mantle plug. Our work suggests that proper modeling of impact-induced load and its resulting deflection is the key to the understanding of physical properties of planetary lithosphere at basin region.
Q. Deng, Z. Zhong, M. Ye, et. al.
Wed, 12 Oct 22
72/75
Comments: N/A