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Atlantis Cruise 3-31 Southern EPR 17°-19°S: The STOWA Expedition |
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Atlantis Cruise 3-31 Southern EPR 17°-19°S: The STOWA Expedition |
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| Sample # | Deg.
S. Lat |
Deg.
W. Long |
Depth (m) | Sample Description | Geologic context |
| Dive 3343 | |||||
| 3343-1 | 18° 36.38 | 113° 23.71 | 2689 | Pillow bud 11 cm long | Animal farm flow (?) |
| 3343-2 | 18° 36.43 | 113° 24.00 | Biology sample | ||
| 3343-3 | 18° 36.43 | 113° 24.00 | 2675 | "animal farm" sheet flow" | Sheet flow from animal farm |
| 3343-4 | 18° 36.82 | 113° 24.08 | 2671 | Rind of lobate crust | Lobate lava flow west of axis |
| 3343-5 | 18° 37.17 | 113° 24.04 | 2672 | Single blade-shaped glassy fold | Near-axis sheet flow |
| 3343-6 | 18° 37.63 | 113° 24.59 | 2676 | Smooth bud from pillow | Pillow bud |
| 3343-7 | 18° 37.69 | 113° 24.34 | 2677 | Tabular piece of folded sheet flow | Axial fissure |
| 3343-8 | 18° 38.40 | 113° 24.39 | 2672 | Large lobate crust ~44x30x8 cm | Bathymetric high |
| 3343-9 | 18° 38.75 | 113° 24.48 | 2679 | Small sheet flow sample. | lava channel near fissure |
| 3343-10 | 18° 38.88 | 113° 24.54 | 2679 | Lobate crust fragment, 12x8.5x9 cm | ~1 km north of waypoint 6 |
| Dive 3344 | |||||
| 3344-1 | 18° 34.81 | 113° 23.90 | 2788 | 13 cm long pillow bud | West side of axis. |
| 3344-2 | 18° 34.81 | 113° 23.90 | 2788 | 19 x11 cm gently curved pillow bud | Partially sedimented pillow lava |
| 3344-3 | 18° 35.03 | 113° 23.53 | 2792 | Angular sheet flow fragment | Pillow near waypoint 2 |
| 3344-4 | 18° 35.13 | 113° 23.69 | 2716 | Curved pillow fragment | Pillow near axis center |
| 3344-5 | 18° 35.27 | 113° 23.79 | 2705 | Pillow bud 8x6 cm | |
| 3344-6 | 18° 35.38 | 113° 23.75 | 2700 | Upper crust of lobate flow | Rubble in lobate flow |
| 3344-7 | 18° 35.53 | 113° 23.74 | 2700 | Folded sheet flow fragments | Crust of lobate flow |
| 3344-8 | 18° 35.48 | 113° 23.66 | 2702 | 3 pieces of altered pillow | In mostly lobate flow |
| 3344-9 | 18° 35.96 | 113° 23.73 | 2686 | Piece of folded sheet flow 26x16 cm | Near edge of lav channels |
| 3344-10 | 18° 35.99 | 113° 23.82 | 2680 | Sheet flow fragment | Near collapse pit and lava channel |
| 3344-11 | 18° 36.26 | 113° 23.77 | 2687 | Thin (3-4 cm) glassy, ropy fragment. | Lava channels near axis |
| 3344-12 | 18° 36.58 | 113° 23.65 | 2700 | Curved pillow fragment | Near Animal Farm |
| Dive 3345 | |||||
| 3345-1 | 18° 37.40 | 113° 24.26 | 2671 | Glassy basalt from folded sheet flow | Edge of collapse wall |
| 3345-2 | 18° 37.56 | 113° 24.29 | 2680 | Basalt with glassy surface | Margin of first channel |
| 3345-3 | 18° 37.57 | 113° 24.31 | 2675 | Basalt/glass fold from sheet flow | Chaotically folded sheet flow |
| 3345-4 | 18° 37.58 | 113° 24.62 | 2689 | glassy pillow bud piece, 7cm x 5 cm | Area of staining |
| 3345-5 | 18° 37.60 | 113° 24.67 | 2693 | Jumbled sheet flow 9cm x 8 cm x 9 cm | Near lobate margin |
| 3345-6 | 18° 37.59 | 113° 24.99 | 2710 | Folded rock from sheet flow | Margin of jumbled channel |
| 3345-7 | 18° 37.61 | 113° 25.20 | 2736 | Shell of drained pillows | Older lavas, maybe a kipuka |
| 3345-8 | 18° 37.63 | 113° 25.25 | 2737 | Very fresh tabular piece of jumbled flow | Jumbled flow near contact |
| 3345-9 | 18° 37.45 | 113° 25.12 | 2731 | Lobate flow chunk with thin glass rind. | Near jumbled contact |
| 3345-10 | 18° 37.64 | 113° 25.12 | 2731 | Piece of jumbled sheet flow | Near contact |
| 3345-11 | 18° 37.78 | 113° 24.55 | 2684 | Jumbled sheet flow samples | SE margin of sheet flow |
| Dive 3346 | |||||
| 3346-1 | 18° 41.98 | 113° 25.32 | 2725 | Aphyric basalt from 15 cm pillow bud | |
| 3346-2 | 18° 42.07 | 113° 25.19 | 2707 | Large pillow bud, 13cm x 9 cm | |
| 3346-3 | 18° 42.13 | 113° 25.12 | 2701 | Gently folded sheet flows | Folded sheet flows |
| 3346-4 | 18° 42.27 | 113° 24.90 | 2680 | Basalt slab, lobate crust? 24 cm long | Lobate crust? |
| 3346-5 | 18° 42.40 | 113° 24.68 | 2679 | folded sheet flow, 17 cm long | Folded sheet in lobate field |
| 3346-6 | 18° 42.40 | 113° 24.68 | 2677 | Folded glassy sheet lava, 11 cm x 9 cm | Near contact with lobate |
| 3346-7 | 18° 42.44 | 113° 24.59 | 2688 | Broken sheet lava, 14 cm x 9 cm | Broken sheet lava |
| 3346-8 | 18° 42.52 | 113° 24.60 | 2685 | Folded sheet flow, with plag up to 5 mm | Near lobate |
| 3346-9 | 18° 43.05 | 113° 24.91 | 2683 | Plag microphyric lobate lava | Heavily sedimented lava |
| 3346-10 | 18° 43.17 | 113° 24.68 | 2676 | Lobate lava, < 1 % plag up to 2-3 mm | High-aspect ratio lobate lava |
| 3346-11 | 18° 43.22 | 113° 24.60 | 2678 | Pillar top, 7 cm at top, 5.5 cm at base | Pillar |
| 3346-12 | 18° 43.22 | 113° 24.60 | 2679 | Middle of pillar/ Interior glass altered | Pillar |
| 3346-13 | 18° 43.22 | 113° 24.60 | 2679 | Top portion of lava pillar, 15 cm tall | Pillar |
| 3346-14 | 18° 43.31 | 113° 24.51 | 2677 | Lobate crust, almost aphyric | Lobate crust |
| 3346-15 | 18° 43.60 | 113° 24.56 | 2671 | Lobate slab, glassy, with spiny drips | Lobate flow |
| 3346-16 | 18° 43.61 | 113° 23.95 | 2730 | Portion of lobate crust, 11 cm x 15 cm | |
| 3346-17 | 18° 43.61 | 113° 23.89 | 2739 | Multiple fragments; rare plag ~ 1 mm | |
| Dive 3347 | |||||
| 3347-1 | 18° 34.85 | 113° 25.02 | 2664 | pillow or lobate, 25 cm x 22 cm x 12 cm | East wall of axis |
| 3347-2 | 18° 34.75 | 113° 25.26 | 2643 | Pillow 19 x 11 cm. broken on ends | West wall of axial trough |
| 3347-3 | 18° 34.72 | 113° 25.07 | 2661 | Weathered portion of lobate flow | In axial trough. |
| 3347-4 | 18° 34.37 | 113° 25.13 | 2655 | Glassy pillow bud | ~10 m from W wall of trough |
| 3347-5 | 18° 34.30 | 113° 25.22 | 2651 | Lobate bud, 24 cm long, 9 cm diam | ~30 m E of W trough wall |
| 3347-6 | 18° 34.18 | 113° 25.13 | 2652 | Jumbled flow piece, 20x10x12 cm | Valley floor |
| 3347-7 | 18° 33.91 | 113° 25.09 | 2055 | Jumbled sheet flow in 2 pieces | Valley floor, 40 m from E wall. |
| 3347-8 | 18° 33.68 | 113° 25.07 | 2651 | Sheet flow. Conical piece 13 cm long | Floor of axial valley |
| 3347-9 | 18° 33.63 | 113° 24.99 | 2610 | Pillow 13x24x17 cm | Top of east wall of axis |
| 3347-10 | 18° 33.50 | 113° 25.17 | 2659 | Jumbled sheet flow, highly contorted | Base of W wall of graben |
| Dive 3348 | |||||
| 3348-1 | 18° 31.41 | 113° 25.95 | 2598 | pillow bud with glass up to 1.5 cm thick | Locally elongated pillow flow |
| 3348-2 | 18° 31.48 | 113° 24.83 | 2598 | Pillow with glass 0.5-0.7 cm thick | Top of hill (outside graben) |
| 3348-3 | 18° 31.67 | 113° 24.8 | 2618 | Cruddy piece with 2-4 mm glass rind | Graben floor, just N of ctc |
| 3348-4 | 18° 31.78 | 113° 24.72 | 2614 | Sheet flow piece 15x23x14 cm | Sheet flow just S of contact |
| 3348-5 | 18° 31.84 | 113° 24.76 | 2611 | Extensively folded glassy sheet flow | ~ 20 m from graben wall |
| 3348-6 | 18° 32.42 | 113° 24.87 | 2596 | Small pillow bud fragment | Pillow near center of graben |
| 3348-7 | 18° 32.71 | 113° 24.93 | 2583 | V. cracked pillow bud | Pillow flow trans. to lobate |
| Dive 3349 | |||||
| 3349-2 | 18° 36.43 | 113° 24.99 | 2675 | Several small pieces, largest 16x9x9 cm | Jumbled sheet flow |
| 3349-9 | 18° 36.66 | 113° 23.96 | Part of sheet flow 39x24x6 cm | Lobate flow W side of trough | |
| 3349-10 | 18° 37.08 | 113° 24.15 | 2677 | 3 pcs. of sheet flow | Sheet flow, bottom of trough |
| 3349-11 | 18° 37.17 | 113° 24.17 | 2677.2 | Folded sheet flow with glassy surfaces | Sheet flow, bottom of trough |
| Dive 3350 | |||||
| 3350-1 | 18° 41.52 | 113° 25.62 | 2729 | Lobate 25 cm long, hackly glass margin | Lobate crust close to pillows |
| 3350-2 | 18° 41.40 | 113° 25.14 | 2693 | Lobate crust with thin glassy rind | Younger lava just E of ctc |
| 3350-3 | 18° 41.34 | 113° 25.02 | 2698 | Large glassy bud with ~ 1% ol + plag | Bud from lobate flow |
| 3350-4 | 18° 41.28 | 113° 24.84 | 2718 | Jumbled sheet lava with ~ 1% olivine | Collapse zone in lobates |
| 3350-5 | 18° 40.38 | 113° 25.02 | 2678 | Lobate crust with ~ 1% plagioclase | Region of sheet/broken lobate |
| 3350-6 | 18° 40.38 | 113° 24.84 | 2690 | Lobate crust with < 1% plagioclase | Collapsed lobate shell |
| 3350-7 | 18° 40.38 | 113° 24.84 | Biology sample | ||
| 3350-8 | 18° 40.32 | 113° 24.66 | 2715 | Stained lobate crust of oliv + plag lava | Collapsed lobate area |
| 3350-9 | 18° 40.26 | 113° 24.90 | 2638 | Lobate crust with < 1% plagioclase | Older lava near west fissures |
| 3350-10 | 18° 40.08 | 113° 24.78 | 2686 | Lobate crust with 1-3%, ol + plag | Younger lava with biota |
| 3350-11 | 18° 40.08 | 113° 24.66 | 2699 | Fresh, glassy sheet with ~ 1 % ol + plag | Very fresh sheet flow |
| Dive 3351 | |||||
| 3351-1 | 18° 08.29 | 113° 20.53 | 2686 | Glassy (pillow bud?) fragments | Age 2.5-3 pillow lava |
| 3351-2 | 18° 08.44 | 113° 20.59 | 2698 | Extinct hydrothermal chimney deposit | Age 2.5 flow |
| 3351-3 | 18° 08.44 | 113° 20.59 | 2694 | Hydrothermal sulfide deposit | Active black smoker |
| 3351-4 | 18° 08.44 | 113° 20.59 | 2696 | Several fragments of extinct chimney | Age 2.5 flow |
| 3351-5 | 18° 08.44 | 113° 20.59 | 2699 | 2 pillow fragments. Essentially aphyric | From lava flow with vents |
| 3351-6 | 18° 08.67 | 113° 20.59 | 2686 | Lobate fragment with two glass layers | Lobate crust |
| 3351-7 | 18° 08.86 | 113° 20.52 | 2712 | Lobate crust fragment | Lobate crust |
| 3351-8 | 18° 09.21 | 113° 20.60 | 2701 | Pillow bud with glassy layer | Age 2.5 - 3.0 pillows |
| 3351-9 | 18° 09.21 | 113° 20.50 | 2686 | Fragments of pillow with glassy rind | Top of first step in wall |
| 3351-10 | 18° 09.63 | 113° 20.57 | 2701 | Very plag-phyric (12-15 vol %) lobate | |
| 3351-11 | 18° 09.67 | 113° 20.62 | 2700 | Pillow or lobate fragment with ~1% plag | |
| 3351-12 | 18° 09.88 | 113° 20.71 | 2685 | Plag-phyric (25-30 vol %) glassy crust | |
| 3351-13 | 18° 09.93 | 113° 20.72 | 2691 | plag-rich (25-30 % lobate crust | |
| Dive 3352 | |||||
| 3352-1 | 18° 10.81 | 113° 21.60 | 2677 | Small bud fragments with 2-5 mm plag | Pillow west of axis |
| 3352-2 | 18° 10.69 | 113° 21 | 2679 | Flat crust with ~ 15% plag and minor ol | Lobate lava flow |
| 3352-3 | 18° 10.72 | 113° 20.90 | 2668 | Folded sheet lava with 5-10% plag ± oliv | Sheet flow |
| 3352-4 | 18° 10.92 | 113° 20.86 | 2688 | Plag-phyric sheet lava | near E wall of graben |
| 3352-5 | 18° 11.02 | 113° 20.98 | 2678 | Lobate crust with ~ 10% plag, ± olivine. | Lobate crust |
| 3352-6 | 18° 11.63 | 113° 21.08 | 2673 | Glassy pillow bud with 10% plagioclase | Near ctc b/w pillow mounds |
| 3352-7 | 18° 12.29 | 113° 21.21 | 2656 | Large bud with 5-10% plagioclase | Top of bathymetric high |
| 3352-8 | 18° 12.66 | 113° 21.23 | 2673 | sheet lava with < 1% plag (± oliv) | Piece of sheet flow |
| 3352-9 | 18° 12.99 | 113° 21.77 | 2681 | Pillow fragment with ~ 5% plag + oliv | Pillow flow |
| 3352-10 | 18° 12.99 | 113° 21.22 | 2652 | Pillar top, sparsely phyric plag-ol | Pillar top |
| Dive 3353 | |||||
| 3353-1 | 18° 21.70 | 113° 22.91 | 2668 | Glass crust from sheet flow | Flat sheet flow; heavy sed |
| 3353-2 | 18° 21.62 | 113° 22.98 | 2668 | Bud with fuzzy Mn coating on glass | Pillow field above lobates |
| 3353-3 | 18° 21.62 | 113° 23.04 | 2674 | Top portion of pillar | In collapse |
| 3353-4 | 18° 21.49 | 113° 23.05 | 2669 | Very tip of bud; glass only | Pillow field |
| 3353-5 | 18° 21.33 | 113° 23.03 | 2661 | Sheet flow crust, <1 vol % plag | Sheet flow |
| 3353-6 | 18° 21.27 | 113° 23.00 | 2666 | Sheet flow crust | Collapse feature at W wall |
| 3353-7 | 18° 20.87 | 113° 23.05 | 2637 | Glassy folded sheet lava | Top of hill, lip of crater |
| 3353-8 | 18° 20.52 | 113° 23.09 | 2651 | Glassy pillow bud 8 cm in diameter | Field of pillows |
| Dive 3354 | |||||
| 3354-1 | 18° 16.93 | 113° 21.64 | 2682 | glassy folded sheet, <1% plag crystals | E side of axis |
| 3354-2 | 18° 16.95 | 113° 21.89 | 2646 | pillow bud; <1% plag crystals | Near top of ridge on E flank |
| 3354-3 | 18° 17.09 | 113° 22.05 | 2658 | sheet/lobate crust; <1% plag | Below >12m fault scarp |
| 3354-4 | 18° 17.18 | 113° 22.15 | 2688 | lobate piece; 1-2% plag and gabbros | Top of 7m-high pillar |
| 3354-5 | 18° 17.38 | 113° 22.43 | 2698 | lobate crust; 1% plag crystals | Floor of inner ditch |
| 3354-6 | 18° 17.42 | 113° 22.59 | 2650 | lobate lava, <1% plag | Near top of West wall |
| 3354-7 | 18° 17.64 | 113° 22.34 | 2667 | lobate crust; rare <<1% plag in clusters | "Bench" suface of graben |
| 3354-8 | 18° 17.83 | 113° 22.21 | 2657 | pillow piece; <<1% plag | Draping scarps, E side of graben |
| 3354-9 | 18° 17.93 | 113° 22.38 | 2676 | small piece of sheet flow; <<1% plag | E side of inner ditch |
| 3354-10 | 18° 17.95 | 113° 22.42 | 2677 | Mn-coated pillar top; <<1% plag | East side of inner ditch |
| 3354-11 | 18° 18.24 | 113° 22.29 | 2641 | pillow/lobate with glass bud; <1% plag | East wall, above talus ramp |
| 3354-12 | 18° 18.26 | 113° 22.25 | 2631 | pillow/lobate lava crust; <1% plag | Above 2nd scarp on E wall |
| Dive 3355 | |||||
| 3355-1 | 18° 14.67 | 113° 21.63 | 2645 | Pillow bud of aphyric basalt | East flank, on terrace |
| 3355-2 | 18° 14.58 | 113° 21.79 | 2689 | Lobate crust with ~ 1% plag and 1 cm gabbroic to troctolitic inclusions | Bench on middle of east wall |
| 3355-3 | 18° 14.68 | 113° 22.11 | 2641 | Aphyric glassy sheet lava with folds | Middle step; W wall |
| 3355-4 | 18° 14.77 | 113° 21.85 | 2677 | Pillow bud; 3-5% ol + plag | Almost down into graben |
| 3355-5 | 18° 14.80 | 113° 21.74 | 2647 | Lobate crust, essentially aphyric | Middle of wall on E side |
| 3355-6 | 18° 14.88 | 113° 21.59 | 2643 | Aphyric lobate crust | Top of scarp on east wall |
| 3355-7 | 18° 15.05 | 113° 21.94 | 2689 | Pillow bud, with 4-5% ol + plag | Down east wall |
| 3355-8 | 18° 15.07 | 113° 22.03 | 2664 | Lobate crust with < 1% scattered plag | Pillar top from central axis |
| 3355-9 | 18° 15.32 | 113° 21.96 | 2693 | Pillow bud; ~ 5% ol + plag and gabbroic xenoliths | Untectonized graben floor |
| 3355-10 | 18° 15.38 | 113° 21.93 | 2670 | lobate crust, << 1% plag ± olivine | Up first step on E side of graben |
| 3355-11 | 15.43 | 113° 21.80 | 2653 | Aphyric lobate or very large pillow bud | ~ 50 m from extinct chimney |
| Dive 3356 | |||||
| 3356-1 | 18° 12.96 | 113° 20.55 | 2758 | Basalt with < 1% plag | Pillow field with 70% sed |
| 3356-2 | 18° 12.97 | 113° 20.71 | 2695 | Aphyric basalt with thin glass rind | In graben, with heavy sed |
| 3356-3 | 18° 13.04 | 113° 20.65 | 2707 | Plag-phyric basalt with glass rind | Near WP 3 |
| 3356-4 | 18° 13.13 | 113° 20.85 | 2635 | Glass rind. 1% plag. phenocrysts | Pillow flow at top of ridge |
| 3356-5 | 18° 13.21 | 113° 21.12 | 2634 | Basalt with 1% plag phenocrysts | Same location as sample #4</ |