Alpha Ridge Island is interpreted to represent the cratonward extension of the Alpha Ridge. The Alpha Ridge is part of the High Arctic Large Igneous Province. Alpha Ridge The Alpha Ridge is a major volcanic ridge under the Arctic Ocean between the Canada Basin (off Ellesmere Island) and the Lomonosov Ridge. It was active during the formation of the Amerasian Basin. It was discovered in 1963. The highest elevation is about 2,700 m over the ocean floor. It is 200 to 450 km wide. The Alpha Ridge, Lomonosov Ridge, and Nansen-Gakkel Ridge are the three major ranges that divide the Arctic Ocean
Argentine Basin Antarctic Bottom Water current, which dominates the circulation in the abyssal layer of the southwest Atlantic, enters the southwest part of the Argentine Basin, then is deflected northward along the continental rise. It passes into the Brazil Basin through the Vema Channel (39° 30′ W) to the west of the Rio Grande Rise. Here, the current reaches velocities of 20–25 cm/s. Argentine Basin The Argentine Basin is a region of the Atlantic Ocean floor off the east coast of Argentina, between the Mid-Atlantic Ridge to the east and the Scotia Basin to the west. To the north is the Brazil