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April 24th, 2003; Leg 5, Day #4

It is nearly midnight now on Thursday, and the science team is hard at work processing samples collected by ROV Tiburon today. 

0424_vibracore.jpg (83925 bytes)During the dive, Tiburon transected the southwest flank of the local ridge crest that we explored on Tuesday. The seafloor was coated with loose and fluffy sediments that were easily stirred up each time Tiburon landed. Samples were collected at intervals up the flank using both the push core and longer vibracore tubes. The sediments were soft enough that Tiburon's manipulator arm could push the vibracore tubes into the seafloor for a sample (see above), a necessary w0424_vibra_elev.jpg (83171 bytes)orkaround as the vibrating motor of the system seemed to be functioning with negligible power. One of the benthic elevators was sent to the seafloor during the dive so that multiple vibracores could be recovered (see right). 

Tomorrow we plan to do a second, parallel transect to today's dive track. This should take us up to another crest where acoustic anomalies have been observed, suggesting that gas bubbles vent from the seafloor here as well. 

Debbie Meyer


0424w-ussler.jpg (69149 bytes)

 

 

Bill Ussler and Elena Perez load a sediment sample into the pore water squeezer.

 

 

 

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