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| North Atlantic opening | |
|---|---|
| Name | North Atlantic opening |
| Type | Oceanic basin formation |
| Period | Mesozoic–Cenozoic |
| Location | North Atlantic Ocean, between Greenland, Europe, and North America |
North Atlantic opening is the progressive geological separation and oceanic basin formation between the continents now occupied by Greenland, Iceland, Britain, Ireland, Scandinavia, Canada, and United States during the Mesozoic and Cenozoic eras. The process transformed the paleogeography of the northern North Atlantic through episodes of rifting, seafloor spreading, magmatism, and plate reorganization linked to global events such as the Breakup of Pangaea, the Cretaceous Normal Superchron, and the developments that led to the North Atlantic Current and modern Atlantic Ocean circulation. Multiple nations' geological surveys and institutions including the British Geological Survey, Geological Survey of Canada, United States Geological Survey, Danish Geological Survey, and universities such as University of Cambridge and University of Oslo contributed to the reconstruction of this opening.
During the Late Triassic and Jurassic period initial rift episodes began between proto-North America and proto-Eurasia, followed by major rifting in the Cretaceous period that produced microcontinents and ocean basins studied by teams from GEUS, Scripps Institution of Oceanography, and the Woods Hole Oceanographic Institution. Magmatic events associated with the North Atlantic Igneous Province and the emplacement of the Shetland Igneous Complex and Lofoten-Vesterålen complexes punctuated continental breakup. The Paleogene saw renewed tectonics with the Eocene flood basalt events and formation of the Iceland hotspot influenced plate motions recorded by the Reykjanes Ridge and Mohns Ridge fracture zones. Rifting episodes created basins such as the Faroe-Shetland Basin, the Svenskøya Basin, and the Labrador Sea whose stratigraphy was mapped by the Norwegian Petroleum Directorate and the Petroleum Affairs Authority of Iceland.
Seafloor spreading along the Mid-Atlantic Ridge and related transforms including the Charlie-Gibbs Fracture Zone drove the separation of the North American Plate and the Eurasian Plate; reconstructions utilize magnetic anomaly records from cruises by the RV Polarstern, RV G.O. Sars, and the RV Knorr. The development of the Jan Mayen Microcontinent and relocation of the Azores–Gibraltar Transform influenced spreading rates, while plate kinematic models by groups at the Institut de Physique du Globe de Paris and Columbia University tie motions to the African Plate and Eurasian Plate interactions. The timing and polarity of spreading are constrained by global chrons including the C26r chron and activities at the Tjornes Fracture Zone adjacent to the Iceland Plateau.
The opening modified gateways between the Arctic Ocean, North Atlantic Ocean, and Tethys Ocean with consequences for Paleogene climates studied by groups at Paleoclimatology units of the Max Planck Institute for Chemistry and Lamont–Doherty Earth Observatory. The establishment of the North Atlantic seaway influenced the Paleocene–Eocene Thermal Maximum heat distribution, the initiation of the North Atlantic Current, and the sequestration of carbon in basins like the Faroes Basin and the Newfoundland Basin. Paleogeographic reconstructions by researchers at University of Edinburgh and University of Copenhagen link opening stages to faunal migrations recorded in sites such as Bjørnfjell and Svalbard.
Formation of deepwater passages altered thermohaline circulation and the genesis of modern features including the Labrador Current, the Gulf Stream, and the North Atlantic Oscillation. Paleoceanographic evidence from programs like Ocean Drilling Program and Integrated Ocean Drilling Program cored sequences in the Rockall Trough and the Porcupine Abyssal Plain, revealing shifts in salinity and current strength coincident with seafloor spreading and gateway openings near the Faeroe Islands and Greenland-Iceland-Scotland Ridge. Model intercomparison projects at Hadley Centre and NOAA simulate how basin geometry changes influenced Cenozoic cooling and the onset of Northern Hemisphere glaciation recorded in cores from Site 907 and Site 647.
Biotic exchanges and provincialism documented in fossil assemblages from locales such as Newfoundland, West Greenland, Scotland, and Denmark reflect vicariance and dispersal tied to opening events; marine microfossils including foraminifera and dinoflagellate cysts studied by researchers at Natural History Museum, London and Smithsonian Institution provide age control. Vertebrate and plant migrations across temporary land bridges and island chains affected ranges of taxa found in Lancaster Sound and Spitzbergen with biostratigraphic correlations produced by teams from Natural History Museum of Denmark and Yale University.
The rifted margins host hydrocarbon provinces such as the Sleipner field, the Hangingstone field, and prospects on the Newfoundland and Labrador Shelf explored by companies including Equinor, BP, ExxonMobil, and Repsol. Geological surveys by StatoilHydro and the Norwegian Petroleum Directorate mapped petroleum systems in the Vøring Basin and Draupne Formation equivalents, while mineral exploration targeted ferro-manganese crusts and massive sulfide prospects near the Mid-Atlantic Ridge reported by Rio Tinto and BHP. Geothermal energy interest around the Iceland hotspot and Atlantic margin wind projects coordinated with agencies such as RenewableUK and national energy ministries highlight the economic importance of the opening.
Key evidence derives from marine geophysical surveys (multibeam, seismic reflection, gravity, magnetics) conducted by vessels like RV Meteor and RV Sonne, and drilling campaigns from IODP and DSDP that recovered stratigraphic sequences, igneous provinces, and magnetic reversal records. Radiometric dating (K–Ar, Ar–Ar) of lavas from Iceland and Faroe Islands alongside biostratigraphy using taxa described at institutions such as Natural History Museum, London and University of California, Berkeley constrain timing. Plate reconstructions use software and datasets from Paleomap Project, GPlates, and collaborative consortia including the International Ocean Discovery Program and the European Geosciences Union to integrate structural, geochemical, and paleomagnetic datasets.
Category:Geology of the North Atlantic