Alvin dive 4612 transcript
Portside observer - Karl Gronvold
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15.1
16
15.7
Landing close to waypoint 1. Coarse lobate pillow flow with few
ornamented pillows. Little sedimentation - looks fairly light.
Touch bottom in lobate pillows
Still on lobate pillows. Sediment cover – among the lightest for for this
observer so far.
Still at waypoint 1. Sediment cover not continuous in cracks and folds
between pillows and lopes..
Sediment thickness variable but appears not to be continuous within
the folds.
Collecting sample 1. Have drifted a little bit SW of WP 1
Over ornamented pillows but loby surfaces present.
In the low point between WP1 and WP2. Still in similar loby pillows
and no marked change in sediment cover or appearance as starting to
climb up to WP2
Current from the north making actual heading uncertain.
Getting close to top of WP2 hill. Loby pillows with some ornamented.
Sediment cover similar to WP1 –not continuous in grooves.
Still very lightly sedimented. The pillows getting smaller as getting
closer to the top of hill WP2.
Sediment cover very light. Very little sediment in the grooves of the
ornamented pillows. The rocks do not look very fresh on the surface.
Not the reflective glass surfaced expected from the thin sediments.
Sampling big sample.
Heading for WP3 but being deflected by currents. Bottom not visible
.Seeing bottom again on the slopes of WP3. Lobate pillow with flow
structures /elongation) from right to left.
Sailed past WP3 across the rift valley. Going against current.
From downwards camera – all pillow lavas. Crossing a small fault.
Mainly small pillows. Sediment between pillows.
Crossing a fault.
Climbing up towards WP4. Fairly well sedimented pillow lavas. Mainly
lobate pillows but with ornamented pillow in between. Sediment
possibly heavier than before.
Just crossed a fault with significant displacement. Then into pillows
again. Significant sedimentation between medium sized pillows with
larger ornamented pillow between..
Climbing towards WP4 (the crater). Still in similar pillows with varying
size. Loby pillows – almost lobate lava but still with ornamental
pillows. Sediment fill continuously lows between the loby part of the
pillows.
There has been a change into fairly rough lobate flows –elongated and
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long sausages.
Climbing up slope with changes back from lobate flows and into more
pillows then back into more lobate but with ornamented pillows
present.
Could be a lava contact. Bottom getting deeper.
Circling at the crater bottom. Broken up sheet flow and with small
pillow fragments with radiating jointing. Sample 3 from the broken up
crater filling. See some of the faulting cutting the crater area but
direction uncertain.
143
Crossing over the broken rubble. Leaving the crater floor to the east
cross again into pillow lavas. Into more pillow than lobate. Broken
pillows indicate fault area. Sedimentation uncertain. - Pillows get
smaller up-hill –micro-pillows and often broken. Facing a shear cliff.
Climbing up a fault wall. Lots of white organic patches on the wall.
On the fault wall. Lot of white organic material and rocks without
glassy surface – look weathered. No simmering observed.
144.6 Crossing a fault. Throw of seven meters and lots of white organic
material. Another fault deep but with little throw (gja). Still with the
white stuff. Heading for WP5. Passing over pillows lobate and
ornamented.
134
Faults with white organic – no simmering. Over lobate flows with
occasional pillows White organic material and then a fault.
WP5 to collect a sample number 4 near the top of the hill. Close to a
big fault with white stuff.
Fairly coarse pillows many ornamented. Looking at geothermal
alteration. Coming to spires but without smoke. Many spires that are
clearly geothermal deposits – more brown in color than the lavas..
Just on the edge of a big fault. With what looks like geothermal
deposits. Rocks are coarse pillow lava.
Sa iling among spires but no simmering observed. The spires have
somewhat weathered appearance with sharp edges removed. Very
little active biology around the chimneys – no shell fragments.Looks
pretty dead.
100
Over pillows of varying diameter. Some ornamented but lobate-like
and elongated.
Big spires with little biological activity and no simmering.
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50.1
On way to WP7. Over a fairly coarse pillow lava. Towards ridge on
south flank of the rift valley. Sediment thickness intermediate on todays scale. Observed five spires up to 12 meters tall.
Pillow lava with fair amount of ornamented pillows. Heading for WP6.
Coming towards a big fault. Deep fault with pillow lavas as far down as
can be seen. With throw down towards north and some minimal white
organics on the walls. Big wide fault with a big throw.
Nearing the top of the ridge of WP7. Pillow lava with variable pillow
sizes and with lobes showing flow direction.
Sailing over a small fault but with a big throw. Over pillow lava.with
variable size pillows and areas o elongated lobate flow structures.
Sailing along the crest of the ridge.
Elongated lobate lavas. Spires seen.
Many spires observed. Very little organic material. Some very big
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spires but no simmering.
Counter current hinders north transit. So head east along edge of ri ft
zone.
Over pillow lavas some small ones in patches. Too high to comment on
sediment thickness.
Lobate looking pillow flow with elongated pillow saugeses.. Nice
ornamental pillows in between.
Not very sedimented and probably more glassy than before.
Ornamented pillows. Small faults. Elongated pillows of the lobate
type.
Over coarse pillow lava. Lobate looking and ornamented in between.
Impression of pillow being more glassy than where the spires were.
Close to top of WP10 hill for final sample.
Out of power droping 1st weight.