Alvin 3362
23 February 1999
Pilot: D. Foster
Port: Cindy Van Dover
Stbd: Eric Bergmanis
TIME | DEPTH | HDG | Observations |
0842 | 1052 | 094 | Maggie Spin |
0849 | End Maggie Spins | ||
0942 | Approaching bottom; broken, platey lobates | ||
0959 | 2582 | 032 | On bottom, took sample of collapse edge from lobate |
1012 | Finished sampling, heading toward Rehu Marka; over lobates | ||
1013 | 2583 | 080 | Budded lobates morphing almost to pillows; older stuff with fractures then elongate pillows and back into budded lobates |
1015 | 2580 | 083 | Lobate flow; some hydrothermal sediment in very small pockets |
1017 | Still older lobate with dandelions | ||
1018 | Solitary pillows among lobates; dense dead serpulid tubes, anemones increasing | ||
1019 | Small mussel patches; Alvin dive wt; all among dead serpulids, some stalked barnacles; where there are mussels, they are ~25% dead | ||
1022 | Continuing through dead serpulids and; no mussels or serpulids, no Phymorhynchus or brachyurans | ||
1023 | Dense orange anemones, more fish; serpulids absent, barnacles absent | ||
1025 | Still in inactive vent field at x/y for Rehu Marka; heading to WP3 | ||
1027 | To heading of due N, for WP3; budded lobate turning to pillow with dense anemones, occasional fish, occasional galatheid. | ||
1028 | Anemone bed with abundant Phymorhynchus and their egg capsules; back into serpulid area. Continuous coverage of vent-like system since 10:19 am. Live barnacles, mussels. Live serpulids here. | ||
1030 | 2580 | 004 | Over dense barnacle bushes; mussel patches 50% dead; no clams in sight, purple cucumbers |
1031 | Extensive bed of dead and dying mussels, dirty barnacles; with very local patches of aactive diffuse flow and "healthier"-looking mussels. This place looks more alive than Animal Farm, but not by much. Oasis is by far the more active of the three main biology sites on this dive series. Buddha's Place beats them all, but was not sampled effectively (1 sample only). | ||
1039 | 2581 | 000 | Small patch of mussels with shimmering water, with dead mussels adjacent. |
1041 | 2581 | Sampling at Rehu Marka Site 1. X = 1180, Y = 243. T in mussels = 9.5C. Live, happy mussels have byssal attachments; dead and dying mussels lack byssal threads and lie next to each other as a single layer rather than as a mound. Ophiuroids among the live mussels. Took 3 pots, 1 scoop box from here. (One pot didn't work.) CLVD now on stbd dive through remainder of dive. | |
1155 | 8 m away from black smoker x 1170 y 254 | ||
1158 | Looking for more mussel patches. Some live clams in the area | ||
1206 | 2581 | Setting up at Rehu Marka Site 2. X = 1149, Y = 276. T in mussels 5.5C. | |
1220 | Pot 1 taken; setting up for second pot. | ||
1229 | Pot 2 and 3, Site 2 taken | ||
1232 | Scoop sample site (very close to pots i.e., 1-2 m). T in mussels 9.2 C. | ||
1318 | Scoop sample without scoop/ using manips, 1-2 mussels at a time | ||
1325 | Looking for tubeworms at smoker. No luck; decide to do geology since all pots are used and scoop is lost at back of basket. Two mussel bins remain empty. | ||
1327 | 2581 | 093 | Over biology still. Anemones. Lobates with local collapses. |
1329 | Local collapses -3-4 m across, with anemones around top margin but not on floor | ||
1330 | 326 | Course to WP4. Anemone density drops; at edge of field | |
1331 | 2585 | 326 | Fractured lobate with dense anemones |
1333 | Anemones, with understory of small dense grey anemones on lobate flow; crossing fiber optic cable of Japanese expt. | ||
1334 | Contact? Fingered margin. Lobates onto lobates. Anemones on both old and new flow in equal densities. | ||
1345 | 2583 | 259 | Sample near WP4; anemone field; heading to WP5 |
1349 | Anemone field, lobate flow. | ||
1350 | Broken old lobates with Phymorhynchus, dandelions; with local collapses | ||
1351 | Larger collapse network big enough for Alvin | ||
1352 | Out of dense anemone field; abundant dandelions | ||
1353 | Lobate flow | ||
1357 | 2583 | 345 | Sampling. |
1405 | 2582 | 090 | Heading to WP6 |
1407 | 2581 | 093 | Over lobates with local collapses. |
1408 | Large collapse region with pillars; rubble in bottom. Flow layers in walls | ||
1413 | 2586 | 092 | Lobates with high relief giving way to pillows |
1414 | Robust pillows | ||
1420 | 2587 | 085 | Into big pillows with buds |
1427 | Sampling complete | ||
1428 | 2582 | 090 | Lobates with solitary pillows; very local hydrothermal staining, spaghetti |
1431 | 2588 | 088 | Budded lobates morphing occasionally to pillows |
1433 | 2591 | 087 | Contact? Sediment cover heavier. |
1445 | 2594 | Finished sampling pillow bud; changing course to 230 to connect contact | |
1447 | 2594 | 236 | Climbing lobates |
1448 | 2598 | Over pillows then to budded lobates with considerable relief. | |
1452 | 2591 | 230 | Climbing a pillow ridge |
1456 | 2589 | Turning to 250; over heavily-dusted lobate | |
1459 | 2579 | 250 | Contact with over-drapes onto glassier flow |
1500 | Last sample; maggie spin at 1000 m. |