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Fig. 25 | Progress in Earth and Planetary Science

Fig. 25

From: The Atlantis Bank Gabbro Massif, Southwest Indian Ridge

Fig. 25

Selected samples from Dives 466 and James Clark Ross Cruise 31 Dredges 20, 34, and 37 (see Fig. 3). a Porphyroclastic granular lherzolite (C-P 1) from 4714 m depth below the gabbro-mantle contact, with serpentine replacing olivine, but only minor replacement of enstatite and diopside (green pyroxene on lower left). b Moderately deformed (C-P 1.0) layered oxide-rich olivine gabbro from above the gabbro-mantle contact at 4614 m depth. c Bioclastic limestone cemented conglomerate from an old submerged shoreline on the western perimeter of the wave-cut platform at 934 m, with serpentinite, gabbro, poorly sorted sandstone, and milky quartz cobbles and clasts. d Partially amphibolitized olivine gabbro mylonite and augen gneiss from the eastern flank of the wave-cut platform. Note the deep pitting of the edges of the slabs interpreted as due to sub-aerial and shallow marine weathering, particularly on the edge of the otherwise well-rounded gneiss cobble in image c. e Oolitic limestone from edge of the northern shelf

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