. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography CANAIT ISLANDS., /FRACTURE 20NE •**• ^ NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION SHIP DISCOVERER TRANS-ATLANTIC GEO-TRAVERSE 1970-1971 /,':/ AFRICA Fig. 1. Index map showing track lines, locations of key magnetic anomalies, and postulated sea floor structure associated with the Kane fracture zone. Outside the track lines the location of the anomalies is taken from Pitman and Talwam [1972]. The fault patterns were inferred only from the magneti
. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography CANAIT ISLANDS., /FRACTURE 20NE •**• ^ NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION SHIP DISCOVERER TRANS-ATLANTIC GEO-TRAVERSE 1970-1971 /,':/ AFRICA Fig. 1. Index map showing track lines, locations of key magnetic anomalies, and postulated sea floor structure associated with the Kane fracture zone. Outside the track lines the location of the anomalies is taken from Pitman and Talwam [1972]. The fault patterns were inferred only from the magnetic anomalies. Arrows indicate sense of displacement along faults; time of displacement is indeterminate The pattern west of the mid-Atlantic ridge axis is consistent in trend with topographic features mapped by Johnson and Vogt [1971]; the existence of small fracture zones trending roughly nor- mal to the ridge axis was established at 3I°W by Harbison and Rona [1972] and Rona el al. [1974]. dividual anomalies in the Cape Hatteras-Cap Blanc corridor, namely, that intrusive activity has taken place over a zone several tens of kilometers wide. The width of the median valley in our profiles is rarely more than 20 km. However, as Deffeyes [1970] points out, dike injection and extrusion can- not be limited to the median valley, and it is not necessary that there be a direct correspondence between the width of the median valley and the width of the zone of intrusion. A relationship may exist between the postulated wide zone of in- jection and the intense fracturing of the sea floor, which has been shown in the western part of the corridor [Johnson and yog:. 1971], Although the dike injection mechanism also offers an explanation for the absence of a median anomaly from two of the profiles, the reason more likely lies in the presence of large volumes of rock forming the topographic prominences cited. In summary, magnetometer data from TAG confirm the presence, immediately north of t
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