Figure 3. A. Hand-contoured 100-m-contour bathymetric map of Site 735
showing the location of Hole 735B modified from Dick et al. (1991b).
SeaBeam tracks hand-shifted by eye to eliminate conflicts in the data.
Solid lines indicate actual data, whereas hatched lines show inferred
contours. Contour interval is 250 m. Small solid dots and arrows indicate
the starting point and approximate track of dredge hauls. Large solid dots
show the location of Sites 735 and 732 (just north of the contoured area
on the crest of the median tectonic ridge). Filled circles indicate the
approximate proportions of rock types recovered in each dredge: + =
gabbro; white = basalt and diabase, light stipples = greenstone, and heavy
stipples = serpentinized peridotite. B. Hand-contoured bathymetric map of
the eastern rift mountains north of the Southwest Indian Ridge axis
showing crust of the same age as that at Site 735 and the conjugate
position of Hole 735B (735B') on the counter-lithospheric flow line, based
on magnetic anomalies and plate reconstruction. This conjugate site is the
location of Southwest Indian Ridge 6, the final backup site for Leg 176,
where the volcanic carapace originally overlying Hole 735B is preserved
intact.