Evolution of the Southwest Indian Ridge from 55°45'E to 62°E : Changes in Plate-Boundary Geometry Since 26 Ma
From 55°45'E to 58°45'E and from 60°30'E to 62°00'E, the ultraslow-spreading Southwest Indian Ridge (SWIR) consists of magmatic spreading segments separated by oblique amagmatic spreading segments, transform faults, and nontransform discontinuities. Off-axis magnetic and multibeam bathymetric data permit investigation of the evolution of this part of the SWIR. Individual magmatic segments show varying magnitudes and directions of asymmetric spreading, which requires that the shape of the plate boundary has changed significantly over time. In particular, since 26 Ma the Atlantis II transform fault ...
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