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Fig. 34 | Progress in Earth and Planetary Science

Fig. 34

From: The Atlantis Bank Gabbro Massif, Southwest Indian Ridge

Fig. 34

Shinkai Dives 458 and 459 (Fig. 3) in profile and plan view. Dive scientists were T. Matsumoto and H. Dick. Dive 459 ended 8 km west of IODP Hole U1473A producing the unusual dive profile (distance along track versus depth) as it started on the lip of a landslip, dropped down on the headwall scar, and then rose back up onto the detachment footwall. Sample 459-5, from 2647 m depth, is semi-consolidated oolitic limestone. Dredge 28 recovered 95 kg of peridotite mylonites and ~ 2 kg of gabbro, mostly veins from the detachment fault damage zone. Sample 33 (upper right) is characteristic of many of these with a talc rim, likely representing the late slip zone after hydration along the fault plane. Note the crisscrossing black veins representing static serpentinization of the mylonite below the sheared talc. Dive 459 first sampled massive mantle, and then massive gabbro

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