This repository accompanies the study “Décollement rheology controls crustal deformation on Early Mars” and provides the numerical simulation results used to investigate how the mechanical behavior of a basal décollement influences large-scale crustal deformation under Martian conditions. The dataset contains outputs from a suite of 2D/3D geodynamic simulations exploring end-member and intermediate décollement rheologies (for example frictional, viscous, or visco-plastic behavior), and their effects on deformation style, localization, and the distribution of strain in the crust. The simulations are designed to represent plausible Early Mars thermal and mechanical regimes and to quantify how variations in décollement strength and strain-rate sensitivity modify tectonic responses. Contents Model outputs: time-dependent fields (for example, velocity, pressure, temperature, stress/strain measures, viscosity or effective strength) saved at selected timesteps. Parameter space summary: tables or metadata describing key input parameters (décollement rheology, friction/creep parameters, crustal thickness, thermal structure, boundary conditions). Figures and diagnostics (if included): processed plots and derived metrics used in the analysis (for example, strain localization indices, integrated shortening/extension, detachment depth proxies). How to use The results can be used to: reproduce the main numerical trends reported in the manuscript, Compare deformation patterns across rheological scenarios, benchmark alternative models of Martian décollement-controlled tectonics, support future meta-analyses of Early Mars lithospheric deformation. Notes File formats and naming conventions follow a run-based structure, with each simulation identified by a unique model ID that links outputs to the corresponding parameter set and initial conditions. Please refer to the included metadata for run definitions and units.