Paleocene-Eocene volcanic segmentation of the Norwegian-Greenland seaway reorganized high-latitude ocean circulation

Abstract The paleoenvironmental and paleogeographic development of the Norwegian–Greenland seaway remains poorly understood, despite its importance for oceanographic climatic conditions Paleocene–Eocene greenhouse world. Here we present analyses sedimentological paleontological characteristics deposits (between 63 47 million years old) in northeast Greenland, investigate key unconformities volcanic facies observed through seismic reflection imaging offshore basins. We identify uplift that culminated widespread regression, volcanism, subaerial exposure during Ypresian. reconstruct paleogeography Atlantic–Arctic region propose this led to fragmentation period. suggest became severely restricted between about 56 53 ago, effectively isolating Arctic from Atlantic ocean thermal maximum early Eocene.