Computer Science
Scientific paper
Jan 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978e%26psl..37..393s&link_type=abstract
Earth and Planetary Science Letters, Volume 37, Issue 3, p. 393-400.
Computer Science
11
Scientific paper
An en echelon suite of four fracture zones, trending approximately N40°E, has been discovered during a survey of the Southwest Indian Ocean Ridge between Bouvet Island and 14°E. The largest of these fracture zones, the Islas Orcadas and Shaka, are less than 30 km wide, have more than 3 km of vertical relief, and are respectively 100 and 200 km in length. The morphology of these and the Bouvet and Prince Edward fracture zones have been used to compute a pole for the relative motion between Africa and Antarctica. This pole, at 4°S and 32°W, is within the range of previously computed pole positions. sRidge basalts were dredged at three separate locations: at the Conrad fracture zone near 55°40'S and 3°51'W, at the Islas Orcadas fracture zone near 54°5'S and 6°4'E, and at the ridge crest near 11°E. In addition, samples from a probable upper mantle intrusion were recovered from one wall of the Islas Orcadas fracture zone. The opposite wall was very different consisting entirely of normal mid-ocean ridge basalt.
Dick Henry
Norton I. O.
Sclater John G.
Woodroffe D.
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