Preboreal onset of cold-water coral growth beyond the Arctic Circle revealed by coupled radiocarbon and U-series dating and neodymium isotopes

Cold-water coral mounds of Lophelia pertusa are widespread across the Scandinavian shelf, which was completely ice-covered during the Last Glacial Maximum between 22 to 18ka BP. Rapid deglacial meltdown of the Fennoscandian inland ice and the retreat of its ice-streams freed most of the shelf of ice by ~15ka BP. However, cold-water coral growth commenced only after the Pleistocene-Holocene transition at 11.65ka BP, when modern-like climatic patterns and oceanographic conditions were established. A tight climatic coupling has been constrained with U-series ages. Coupled ¹⁴C ages provide local reservoir ages from various gravity cores in a fjord-setting in Stjernsund at 70°N and on the open shelf in Trænadjupet at 66°N. Reinvestigation of earlier ¹⁴C coral chronologies suggests that coral ecosystems widely established themselves across the entire 3000km long Scandinavian shelf prior to ~10ka BP. The earliest occurrence of Madrepora oculata at ~2.4ka BP suggests a late Holocene colonization of the Norwegian shelf, which is linked to a prominent mound growth hiatus in Trænadjupet (64°N). Mound growth rates near the northern biogeographic boundary of L.pertusa with up to ~614cmka ^-1 during certain growth periods are much higher than the previously reported fastest rates of ~220cmka ^-1 from the Irish margin. Contemporaneous rapid fjordbasin sedimentation is slower with ~63cmka ^-1. Matrix ¹⁴C ages overlap with coral ¹⁴C ages from the same horizon. This indicates rapid framework construction and efficient trapping of background sediment. Hiatuses are frequent in on-mound sediments and only short periods of coral growth are recorded. Coupled Δ ¹⁴C and ε _Nd values indicate a persistent Holocene inflow of the North Atlantic Current in Stjernsund, but also deglacial meltwater mixing during the early Holocene prior to ~9.5ka BP. Reservoir ages are overall close to the surface marine reservoir age, but ΔR is highly localized.