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Earth of fire

Actualité volcanique, Article de fond sur étude de volcan, tectonique, récits et photos de voyage

Publié le par Bernard Duyck
Publié dans : #Actualités volcaniques
ROV Deep Discover on the vents of Chamorro seamount - 2016.06.24 - courtesy of the NOAA Office of Ocean Exploration and Research, 2016 Deepwater Exploration of the Marianas.

ROV Deep Discover on the vents of Chamorro seamount - 2016.06.24 - courtesy of the NOAA Office of Ocean Exploration and Research, 2016 Deepwater Exploration of the Marianas.

The exploration season of NOOA 2016 / Okeanos Explorer on the Mariana volcanic arc continues to give us surprises.

Hydrothermal vents are most often located in areas volcanicaly or tectonically active. Exploration of the Chamorro seamount - 20.8 ° N ° E 144 683 - which knows no historical eruptions, let not presaged the discovery of new vents.

Map of the arc of the Marianas northern part - Modified from Fryer et al. (1999)

Map of the arc of the Marianas northern part - Modified from Fryer et al. (1999)

On 24 June 2016, the ROV Deep Discover begins his dive to 980 meters on the outer southeast slopes of the summit crater of Chamorro, and crosses a fragmented ocean floor, made of volcanic ash, pebbles and rocks.

The first discovery is a small fireplace with vent emits fluid to 10.5 ° C.
A descent into the crater allows to document an additional hydrothermal activity in a field of unknow vents. The mouths of the chimneys, high of only one to two meters, are small, but emit fluids at 31.14 ° C.

Video courtesy of the NOAA Office of Ocean Exploration and Research, 2016 Deepwater Exploration of the Marianas. - Heard on the video: Dr. Shirley Pomponi & Dr. Patricia Fryer

The dominant fauna during this dive is known to be found in common association with vents: Stylasteridae corals, Alvinoconcha snails, alvinocarididae shrimp, and crabs.

More special, amphipods, rare blind lobsters, demosponges, cutthroat eels and rattails.
 

Chamorro vent field fauna - courtesy of the NOAA Office of Ocean Exploration and Research, 2016 Deepwater Exploration of the Marianas.

Chamorro vent field fauna - courtesy of the NOAA Office of Ocean Exploration and Research, 2016 Deepwater Exploration of the Marianas.

Source : NOAA - Okeanos Explorer - 2016 Deepwater Exploration of the Marianas - link

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