Nares abyssal plain. No primary manganese mineral is apparent.

Nares abyssal plain. Lying generally between the foot of a continental rise and a mid-ocean ridge, abyssal plains are among the flattest, smoothest and least explored regions on Earth. This distal plain is connected to the Hatteras Abyssal Plain by the Vema Gap. Additional information (en): Shown as Nares Plain in the ACUF Gazetteer. Large diameter piston cores up to 26 meters in length were obtained within the Fragile abyssal foraminifera (including new Komokiacea) from the Nares Abyssal Plain C. The Blake–Bahama Outer Ridge, an extended sedimentary tongue of the North American Basin, also separates it from the narrow Blake–Bahama Basin. Schroder,* F. They are poorly preserved in the sedimentary record, because they tend to be consumed by the subduction process. Scott Centre for Marine Geology, Department of Geology, Dalhousie University, Halifax, Nova Scotia B3H 3J5, Canada Seismic reflection profiles from the Southern Nares Abyssal Plain and the Madeira Abyssal Plain show faultlike displacements of subbottom reflections in areas of thickest sediment accumulation. S. An understanding of these patterns is a basis for a successful site investigation in an abyssal plain setting. Its area, according to Heczens calculations, is 37,000 square miles. No primary manganese mineral is apparent. The Nares Abyssal Plain is bounded by the Bermuda Plateau, a zone of abyssal hills adjacent to the Mid Atlantic Ridge, and the Outer Ridge. Abyssal plains were not recognized as distinct physiographic features of the sea floor until the late 1940s and, until recently, none had been studied on a systematic basis. Medioli and D. [1] Abyssal plains are key geologic elements of oceanic basins (the other elements being Marine Regions · Nares Abyssal Plain (Abyssal Plain)Marine Gazetteer Placedetails The Nares Abyssal Plain is situated in the Western North Atlantic between 22° and 25° N and 60° and 67° W. To the west it joins with the Vema Trough and the Hatteras Abyssal Plain. The plain comprises the western part of the North American Basin and is separated from the Nares Abyssal Plain to the southwest by the Vema Abyssal Gap, located at 24° N and 68° W. J. A r. The eastern North Atlantic Madeira Abyssal Plain and the western North Atlantic Nares Abyssal Plain may serve as examples of the resulting widely differing sedimentary patterns. Three nodules from a core taken north of Puerto Rico are composed chiefly of an x-ray amorphous, hydrated, iron-manganese oxide, with secondary goethite, and minor detrital silicates incorporated during growth of the nodules. The study site contains pelagic and hemipelagic sediments with upper meters containing predominantly finegrained turbidites. Significant lateral variations of the sedimentation rate also occur; a maximum average sedimentation rate of several decimetres per 1000 years has been deduced. ABSTRACT: The study of eight samples from the Nares Abyssal Plain has shown that the rhizopodan surface population of the area is dominated by forms with fragile, flexible tests. B. An abyssal plain is an underwater plain on the deep ocean floor, usually found at depths between 3,000 and 6,000 meters (9,800 and 19,700 ft). wgv2u 9fe nipb8d0 zp7j hbf pwv ki atfxlb k2apvt 3ge0l8