Base of “black smoker” chimney, Pacific Ocean [image credit: USGS]
How many more such discoveries could be waiting to be made? The report says ‘Geologic evidence…suggests that hydrothermal activity is part of a cycle that reshapes the seafloor over many thousands of years’.
An autonomous diving robot captured the vents in unprecedented detail, reports Live Science.
In the dark ocean depths off the coast of the Pacific Northwest, a magical fairyland of towering spires and hydrothermal chimneys sprout from the seafloor, a stunning new underwater map reveals.
These towers belch superheated liquid warmed by magma deep inside Earth.
The field of hydrothermal chimneys stretches along the ocean bottom on the Juan de Fuca Ridge to the northwest of coastal Washington state, in an area known as the Endeavor Segment.
Research on the Endeavor vents began in the 1980s, and scientists had previously identified 47 chimneys in five major vent fields.
But recent expeditions, using an autonomous underwater vehicle operated by the Monterey Bay Aquarium Research Institute (MBARI) revealed more than 500 chimneys in a zone about 9 miles (14 kilometers) long and 1 mile (2 km) wide.
Deep-sea chimneys form around hydrothermal vents from a buildup of minerals that flow to the surface in heated liquid — as hot as 750 degrees Fahrenheit (400 degrees Celsius). As hot liquid meets cold seawater, minerals precipitate and settle around the vent, collecting to form towers that can reach impressive heights.
At the Endeavor Segment, “abundant and vigorous” hydrothermal activity has transformed the seafloor for approximately 2,300 years, and periods of intense seismic vibration shake things up even more, according to a new study on the MBARI expedition.
Chimneys that climb from Endeavor are among the tallest in any mid-ocean ridge; the biggest ever documented, a top-heavy tower known affectionately as “Godzilla,” extended 150 feet (45 meters) from the seafloor, but it crumbled in 1995.
Continued here.
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May 5, 2020 at 03:48AM
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