Crustal Separation Between Eurasia and North America-Greenland: Opening of The Arctic-North Atlantic Ocean
Published:January 01, 1988
1988. "Crustal Separation Between Eurasia and North America-Greenland: Opening of The Arctic-North Atlantic Ocean", Evolution of the Arctic-North Atlantic and the Western Tethys, Peter A. Ziegler
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During the late Paleocene, volcanic activity increased sharply in the area of the Rockall-Faeroe Trough, in the southern parts of the Norwegian-Greenland Sea Rift, between the Rockall-Hatton-Faeroe Bank and Greenland, and in the Davies Strait. Additional volcanic centers developed to the north of Ellesmere Island at the junction between the Nansen Rift and the Senja-De Geer fracture zone (Plate 17).
This regional volcanic surge, during which extensive plateau basalts were extruded, is referred to as the so-called Thulean Volcanism. It is the surface expression of the final rifting phase that preceded crustal separation between Greenland and the Rockall-Hatton-Faeroe Bank and Norway, between the Barents-Kara Sea Shelf and the Lomonosov Ridge, and between Greenland and Baffin Island (Talwani and Eldholm, 1977; Srivastava and Falconer, 1982). Following crustal separation and the beginning of sea-floor spreading in these areas, volcanic activity generally abated quickly but persisted till the present in the Iceland hotspot (Vogt, 1983).
In the Labrador Sea, a major change occurred in the location of its sea-floor spreading axis during the late Paleocene between anomalies 25 and 24 (TUcholke and Fry, 1985). This was paralleled by the development of the Reykjanes sea-floor spreading ridge in the northward prolongation of the North Atlantic spreading axis, and of the Aegir and Mohn’s ridges in the Norwegian-Greenland Sea. In the Arctic-North Atlantic, the oldest magnetic sea-floor anomaly recognized is anomaly 24. This suggests that crustal separation between Eurasia and Greenland was achieved around 56 Ma during the earliest Eocene (Talwani and Eldholm, 1977; Vogt
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Evolution of the Arctic-North Atlantic and the Western Tethys
A broad, multi-disciplinary overview of the late Paleozoic to Recent geological evolution of much of northeastern North America, Greenland, all of Europe, and the northern parts of North Africa. This outstanding synthesis of regional geology retraces the evolution of sedimentary basins developed during the rifting phases that preceded the opening of North Atlantic ocean basins and highlights the scope of the associated intra-plate phenomena.This CD publication is the digital version of AAPG's landmark 1988 volume on the evolution of the North Atlantic Ocean. Ten chapters and 30 full-color plates. 200 pages. All articles presented in Adobe Acrobat PDF format.