New kind of hydrothermal vent system found in Caribbean

New kind of hydrothermal vent system found in Caribbean

Date: December 22, 2015

Source: University of Southampton

Summary:Researchers have identified hydrothermal vents in the deep sea of the Caribbean which are unlike any found before. They are unusual in their structure, formed largely of talc, rather than the more usual sulphide minerals. Researchers analyzed samples from the VDVF - a vent field south of the Cayman Islands discovered by scientists and crew on board the RRS James Cook in 2010, and have published their findings.


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A high resolution 3D bathymetry of the Von Damm
vent field.

Credit: NOCS
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Researchers from the University of Southampton have identified hydrothermal vents in the deep sea of the Caribbean which are unlike any found before.


Collaborating with colleagues at the National Oceanography Centre, the team has revealed active vents in the Von Damm Vent Field (VDVF) that are unusual in their structure, formed largely of talc, rather than the more usual sulphide minerals.

Lead researcher Matthew Hodgkinson and colleagues analysed samples from the VDVF -- a vent field south of the Cayman Islands discovered by scientists and crew on board the RRS James Cook in 2010. Results of the analysis are now published in the journal Nature Communications.

Matthew comments: "This vent site is home to a community of fauna similar to those found at the Mid-Atlantic Ridge in the Atlantic Ocean, but the minerals and chemistry at the Von Damm site are very different to any other known vents."

Hydrothermal vents form in areas where Earth's tectonic plates are spreading. At these sites, circulating seawater is heated by magma below the seafloor and becomes more acidic -- leaching metals from the surrounding rocks and redepositing them as the hot water spews out of vents or 'chimneys' at the seabed and hits the cold seawater.

More:
http://www.sciencedaily.com/releases/2015/12/151222113611.htm