. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography 112 80° W 70° 60° 50° 40° 30° 20° WW 0° 60" N - - 60° N. - 10° N 10°S 80°W 70 30° 20° 10°W 0° Fig. 1. Map of the Atlantic ocean basin showing principal litho- spheric plates, axis of the Mid-Atlantic Ridge, major fracture zones that form small circles symmetric about the ridge axis, minor fracture zones that form V-shaped configurations asym- metric about the ridge axis delineated in areas of relatively de- tailed investigations (boxes). The co
. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography 112 80° W 70° 60° 50° 40° 30° 20° WW 0° 60" N - - 60° N. - 10° N 10°S 80°W 70 30° 20° 10°W 0° Fig. 1. Map of the Atlantic ocean basin showing principal litho- spheric plates, axis of the Mid-Atlantic Ridge, major fracture zones that form small circles symmetric about the ridge axis, minor fracture zones that form V-shaped configurations asym- metric about the ridge axis delineated in areas of relatively de- tailed investigations (boxes). The configuration of inferred minor fracture zones in the area at 6°S is predicted rather than observed, as discussed in the text. and intervening ridges with the rift valley reverses be- coming nearly normal on the east side and oblique on the west side. The V formed by the intersection of the transverse ridges and intervening valleys at the sites south of the Azores triple junction points northward (Fig. 1). The characteristics of the minor fracture zones de- scribed are distinct in several respects from major frac- ture zones. Major fracture zones of the Atlantic like the Gibbs (latitude 52°N) [13], the Oceanographer (latitude 35°N) [14], the Atlantis (latitude 30°i\J [15], the Kane (latitude 24°N) [16], and the Vema (latitude 10°N) [17], follow families of small circles symmetric about the axis of the Mid-Atlantic Ridge, generally ex- hibit ridge-ridge offsets of at least 100 km, and are spaced hundreds of kilometers apart along the ridge axis. 3. Apparent and true relative rates of sea-floor spread- ing Determination of rate and direction ol sea-floor spreading are related in that the apparent and true relative rates of spreading are a function ol direction. The principle method to determine spreading rate is based on the Vine and Matthews hypothesis [18]. Strips of crustal material that are alternately magnetized dur- ing spreading about an oceanic ridge a
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