Published:January 01, 1990
Geologically, the East Greenland Shelf remained virtually unexplored for many years while the onshore East Greenland Mesozoic basin stratigraphy was intensely studied and served as a reference for the interpretation of the offshore East Greenland and northwest European margins. This development was a natural consequence of the excellent onshore basin exposure while polar pack ice is found almost year-around on the East Greenland shelf. The first geophysical information from the East Greenland shelf was published by Vogt (1970), Eldholm and Windisch (1974), Johnson and others (1975a, b), B. Larsen (1975), H. C. Larsen (1975, 1978), Henderson (1976), and Featherstone and others (1977).
Results of the first multichannel reflection seismic surveying on the shelf were reported by Hinz and Schlüter (1978, 1980). On the basis of this information and initial results from an aeromagnetic survey (H. C. Larsen and Thorning, 1979, 1980), a regional geological model for the East Greenland Shelf was proposed by H. C. Larsen (1980). This model involved early Tertiary oceanic crust thought to be present below parts of the outer shelf off central East Greenland and subsided continental crust thought to be present up to approximately 100 km seaward of the shelf break off southeastern Greenland. The actual position of the shelf edge was found to be controlled mainly by post-rift sedimentation rather than deep crustal features (H. C. Larsen, 1980). It was further suggested that Cenozoic basins might dominate the southern half of the shelf while Mesozoic and Paleozoic basins were likely to be present beneath the northern shelf.
Figures & Tables
The Arctic Ocean Region
Most Quaternary sediments in North America north of 45 ON post-date the last deglaciation. This volume looks at those extensive deposits from the standpoints of timing, cause, and mechanism of the wastage of North American ice during the last deglaciation and the accompanying environmental changes in the nonglaciated and deglaciated areas. It particularly examines the mechanisms by which a mass of ice equivalent to 100 m of global sea-level was returned to the ocean within about 8,000 years. A truly comprehensive synthesis of marine and terrestrial information in 22 chapters grouped into five sections: Chronology of Disintegration of the North American Ice Sheets, Ice Core and Other Glaciological Data, the Nonglacial Physical Record on the Continent, Biological Record on the Continent, and Analysis and Summary. Includes two oversize color plates showing time-series maps of pollen densities and vegetation changes since 18 ka.