Physics
Scientific paper
Sep 1973
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973e%26psl..20...93k&link_type=abstract
Earth and Planetary Science Letters, Volume 20, Issue 1, p. 93-99.
Physics
3
Scientific paper
The orientation and rate of spreading of the Chile Ridge is not well known owing to the paucity and poor orientation of the geophysical observations defining the ridge system. A recent profile crossing the Chile Ridge at 40°S, 92°W suggests that the half-spreading rate may be as high as 41 mm-yr-1 from 0 to 5 myBP and 56 mm-yr-1 from 5 to 9 myBP as opposed to previous estimates of 20 to 30 mm-yr-1. In contrast to the rugged bathymetric relief which has been previously reported for the Chile Ridge, the new profile shows a 500 km-long section of ``smooth'' crust on the eastern flank. We interpret most of the rugged relief which has been observed as being due to numerous fracture zones offsetting the ridge and trending 080° +/- 10°. Based on a skewness study of the magnetic anomalies, the ridge crest segments have been determined to be oriented along 350° +/- 7°. This makes the ridge axis normal to the fracture zones and parallel to the final strike of the Galapagos Rise.
Grow J. A.
Klitgord Kim D.
Larson P. A.
Mudie John D.
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