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Lithosphere is an outer rigid part of the terrestrial body, usuallyconsisting of the crust and part of the mantle. Characterizing the physicalproperties of the lithosphere is critical in investigating its evolution. Bymodeling mass-related loads within the lithosphere, physical parameters such asthe elastic thickness of the lithosphere can be inferred from gravity andtopography data. In the impact basin region, however, the lowtopography-gravity correlation and the sharp change in admittance from negativeto positive within a narrow spheric harmonic degree make this modelinapplicable. In this work, we incorporated mantle uplift structures commonlyformed in impact basin regions into the lithospheric loading model. Thecrustal-mantle boundary of this mantle uplift structure is inferred from theglobal crustal thickness model. The gravity anomaly of the deflectedlithosphere is calculated at the surface and crustal-mantle boundary, then thetheoretical gravity admittance and correlation can be compared with theobserved data. We sampled parameters using this mantle loading model at Argyreand Isidis basin on Mars with a novel crustal thickness model from the InSightmission. Our work suggests that proper modelling of the impact-induced load iscritical to understanding the physical properties of the planetary lithospherein the basin region.

Lithospheric loading model for large impact basin where mantle plug presents