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Gakkel Ridge |
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Gakkel Ridge
an underwater ridge in the Arctic Ocean between the abyssal Nansen and Amundsen depressions, the northern continuation of the Middle Atlantic Ridge. It is more than 1,000 km long and is composed of almost parallel ridges and numerous cone-shaped mountains of volcanic rocks (mainly basalts). Along the axis of the ridge there are deep canyons 20-30 km wide that form a rift valley. The summits of the ridge rise up to 4,000 m above the bottom of the ocean; the minimum known depth above the ridge is 400 m (the Lenin Komsomol Seamount). There is underwater volcanic and earthquake activity. The ridge was named in honor of its discoverer, Ia. Ia. Gakkel’. Want to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit the webmaster's page for free fun content. |
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No references found | These are the first pyroclastic deposits we've ever found in such deep water, at oppressive pressures that inhibit the formation of steam, and many people thought this was not possible," said WHOI geophysicist Rob Reves-Sohn, chief scientist of an expedition to the Gakkel Ridge in July 2007. The surprising discovery of mantle rocks indicated that Gakkel Ridge is one of only two places known on the planet where the tectonic plates that make up Earth's hard outer crust slide apart and expose large slabs of the mantle on the seafloor. A few submarine missions used sonar to make maps of the Gakkel Ridge beneath the eastern Arctic Ocean. |
Gakkel Ridge |
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