Supporting materials: Geophysical and geochronological data files from Cocos Plate study. Figure numbers refer to those published in Naif et al. (2023). SRTM_residual_bathymetry_Fig2b.grd contains residual bathymetry data and metadata used to produce Fig. 2b. MGL0807-01.pstm-v2d.0.segy contains multi-channel seismic data and metadata used to produce Fig. 4. s04_CSEM_Fig4b.mat and s10_CSEM_Fig4c.mat contain CSEM data and metadata used to produce Fig. 4b and Fig. 4c. The following files contain CSEM inversion model used to produce Fig. S1 (the model can be plotted using the MARE2DEM code): lessLEM_corr159km.data perRxTxAll.15.resistivity perRxTxAll.15.resp perRxTxAll.poly The following files contain pdf figures, data and metadata from Ar/Ar geochronological measurements on core samples of gabbro sills from ODP Leg 205, Hole 1253A (used to produce Fig. S2): 40Ar-39Ar Full raw data.xlsx 40Ar-39Ar Full raw data.txt 40Ar-39Ar_StepHeating-Run_30995-01_ODP-205-1253A-10R_FigS2a.pdf 40Ar-39Ar_Isochron_Run_30995-01_ODP-205-1253A-10R_FigS2b.pdf 40Ar-39Ar_StepHeating-Run_30998-01_ODP-205-1253A-34R_FigS2c.pdf 40Ar-39Ar_Isochron_Run_30998-01_ODP-205-1253A-34R_FigS2d.pdf Residual_GEBCO2021_bathymetry_FigS3a.grd and Residual_v30_Gravity_FigS3b.grd contain residual bathymetry and residual gravity data and metadata used to produce Fig. S3.