Southeast Ellesmere Island was the site of two major deformation events that affected the Arctic during the Phanerozoic; the Late Devonian to Early Carboniferous Ellesmerian Orogeny and the Palaeogene Eurekan Orogeny (e.g., Trettin, 1991). Both deformation belts run parallel or sit on top of each other and stretch for >2,500 km across the Canadian High Arctic, North Greenland, and Svalbard (Figure 1a). The deformation fronts of both orogens cross our study area (Figure 1b). Particularly for the Ellesmerian Orogeny, timing and rates are still poorly constrained (e.g., Beauchamp et al., 2019;McClelland et al., 2023;Piepjohn et al., 2007). In Ellesmere Island, this orogeny affected sediments of the Neoproterozoic to early Palaeozoic Franklinian Basin (Figure 1b). After Ellesmerian deformation ceased, the Sverdrup Basin developed within the area of the former Ellesmerian Orogen. The Sverdrup Basin remained an active depocenter until the Eurekan Orogeny (Embry &
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