Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:


Volcanic mysteries unraveled underwater


Almost all of the active volcanoes on Earth lie beneath miles of seawater at mid-ocean ridges, creating the long chain of volcanic mountains that encircles the Earth like the seam of a baseball. Scientists have long been puzzled by the observation that flows, erupted as white-hot lava at mid-ocean ridges, can be traced for several miles from their vents despite the fact that they erupt into seawater close to its freezing point. Now a group of scientists from academia and government believe they have the answer from lava samples collected using the deep-sea submersible ALVIN.

In the most recent issue of the magazine Nature, scientists from the U.S. Geological Survey (USGS) and an international group of university researchers report that the tops of the lavas chill against cold seawater protecting the molten interior, which moves forward on a thin film of vaporized seawater much like a hydrofoil. The seawater steam also bubbles through the lava and forms large cavities within the flowing, white hot material. Because of the high pressures, these cavities later collapse, producing a "swiss cheese" texture on the surface of the lava flow.

A critical piece of evidence came through very high magnification images of the insides of these cavities, using a sophisticated scanning electron microscope at the USGS in Denver, Colo. The images showed the presence of molten salt and many exotic minerals that could only have formed from vaporized seawater at very high temperatures.

"Previously, scientists had thought that seawater could never boil at the great depths of mid-ocean ridges but now it appears that hot vaporized seawater plays a major role in building new oceanic crust", said Dr Ian Ridley, a co-author on the Nature report, and a research scientist with the USGS.

Heidi Koontz | EurekAlert!
Further information:

More articles from Earth Sciences:

nachricht Wandering greenhouse gas
16.03.2018 | Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung

nachricht Unique Insights into the Antarctic Ice Shelf System
14.03.2018 | Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung

All articles from Earth Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Locomotion control with photopigments

Researchers from Göttingen University discover additional function of opsins

Animal photoreceptors capture light with photopigments. Researchers from the University of Göttingen have now discovered that these photopigments fulfill an...

Im Focus: Surveying the Arctic: Tracking down carbon particles

Researchers embark on aerial campaign over Northeast Greenland

On 15 March, the AWI research aeroplane Polar 5 will depart for Greenland. Concentrating on the furthest northeast region of the island, an international team...

Im Focus: Unique Insights into the Antarctic Ice Shelf System

Data collected on ocean-ice interactions in the little-researched regions of the far south

The world’s second-largest ice shelf was the destination for a Polarstern expedition that ended in Punta Arenas, Chile on 14th March 2018. Oceanographers from...

Im Focus: ILA 2018: Laser alternative to hexavalent chromium coating

At the 2018 ILA Berlin Air Show from April 25–29, the Fraunhofer Institute for Laser Technology ILT is showcasing extreme high-speed Laser Material Deposition (EHLA): A video documents how for metal components that are highly loaded, EHLA has already proved itself as an alternative to hard chrome plating, which is now allowed only under special conditions.

When the EU restricted the use of hexavalent chromium compounds to special applications requiring authorization, the move prompted a rethink in the surface...

Im Focus: Radar for navigation support from autonomous flying drones

At the ILA Berlin, hall 4, booth 202, Fraunhofer FHR will present two radar sensors for navigation support of drones. The sensors are valuable components in the implementation of autonomous flying drones: they function as obstacle detectors to prevent collisions. Radar sensors also operate reliably in restricted visibility, e.g. in foggy or dusty conditions. Due to their ability to measure distances with high precision, the radar sensors can also be used as altimeters when other sources of information such as barometers or GPS are not available or cannot operate optimally.

Drones play an increasingly important role in the area of logistics and services. Well-known logistic companies place great hope in these compact, aerial...

All Focus news of the innovation-report >>>



Industry & Economy
Event News

Ultrafast Wireless and Chip Design at the DATE Conference in Dresden

16.03.2018 | Event News

International Tinnitus Conference of the Tinnitus Research Initiative in Regensburg

13.03.2018 | Event News

International Virtual Reality Conference “IEEE VR 2018” comes to Reutlingen, Germany

08.03.2018 | Event News

Latest News

Wandering greenhouse gas

16.03.2018 | Earth Sciences

'Frequency combs' ID chemicals within the mid-infrared spectral region

16.03.2018 | Physics and Astronomy

Biologists unravel another mystery of what makes DNA go 'loopy'

16.03.2018 | Life Sciences

Science & Research
Overview of more VideoLinks >>>