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Science 31 July 1992:
Vol. 257. no. 5070, pp. 627 - 634
DOI: 10.1126/science.257.5070.627
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Articles
Structural Processes at Slow-Spreading Ridges
John C. Mutter 1 and
Jeffrey A. Karson 2
1 Lamont-Doherty Geological Observatory and Department of Geological Sciences, Columbia University, Palisades, NY 10964
2 Department of Geology, Duke University, Durham, NC 27706
Slow-spreading (<35 millimeters per year) mid-ocean ridges are dominated by segmented, asymmetric, rifted depressions like continental rifts. Fast-spreading ridges display symmetric, elevated volcanic edifices that vary in shape and size along axis. Deep earthquakes, major normal faults, and exposures of lower crustal rocks are common only along slow-spreading ridges. These contrasting features suggest that mechanical deformation is far more important in crustal formation at slow-spreading ridges than at fast-spreading ridges. New seismic images suggest that the nature and scale of segmentation of slow-spreading ridges is integral to the deformational process and not to magmatic processes that may control segmentation on fast-spreading ridges.
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