Figure 5. Summary of radiometric ages for the volcanic rocks recovered in Southeast Greenland during Legs 152 and 163. Shown are ⁴⁰Ar-³⁹Ar ages of this study (circles) and previous studies (squares; Sinton and Duncan, 1998; Werner et al., 1998). Reverse magnetic polarity is shown by open symbols and normal polarity by closed symbols (Duncan, Larsen, Allan, et al., 1996; Vandamme and Ali, 1998; Hooper et al., Chap. 10, this volume). The time scale on the left is after Berggren et al. (1995). Argon ages and the time scale is calibrated to 27.84 Ma for the FCT-3 biotite monitor, or 520.4 Ma for Mmhb-1. Also shown are the time windows for tholeiitic magmatism in the onshore East Greenland Tertiary Igneous Province (EGTIP) (Storey et al., 1996; Tegner et al., 1998a) and the age of final plate separation. See text for details.