The Info List - Gakkel Ridge

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The Gakkel Ridge
Gakkel Ridge
(formerly known as the Nansen Cordillera and Arctic Mid-Ocean Ridge)[1] is a mid-oceanic ridge, a divergent tectonic plate boundary between the North American Plate
North American Plate
and the Eurasian Plate.[2] It is located in the Eurasian Basin
Eurasian Basin
of the Arctic Ocean, between Greenland
and Siberia, and has a length of about 1,800 kilometers. Geologically, it connects the northern end of the Mid-Atlantic Ridge with the Laptev Sea Rift. The existence and approximate location of the Gakkel Ridge
Gakkel Ridge
were predicted by Soviet polar explorer Yakov Yakovlevich Gakkel, and confirmed on Soviet expeditions in the Arctic around 1950. The Ridge is named after him, and the name was recognized in April 1987 by SCUFN (under that body's old name, the Sub-Committee on Geographical Names and Nomenclature of Ocean Bottom Features).[1] The ridge is the slowest known spreading ridge on earth, with a rate of less than one centimeter per year. Until 1999, it was believed to be non-volcanic; that year, scientists operating from a nuclear submarine discovered active volcanoes along it. In 2001 two research icebreakers, the German Polarstern and the American Healy, with several groups of scientists, cruised to the Gakkel Ridge
Gakkel Ridge
to explore it and collect petrological samples. Among other discoveries, this expedition found evidence of hydrothermal vents. In 2007, Woods Hole Oceanographic Institution conducted the "Arctic Gakkel Vents Expedition" (AGAVE), which made some unanticipated discoveries, including the unconsolidated fragmented pyroclastic volcanic deposits that cover the axial valley of the ridge (whose area is greater than 10 km2). These suggest volatile substances in concentrations ten times those in the magmas of normal mid-ocean ridges.[3] Using "free-swimming" robotic submersibles on the Gakkel ridge, the AGAVE expedition also discovered what they called "bizarre 'mats' of microbial communities containing a half dozen or more new species".[4]


1 References 2 See also 3 Further reading 4 External links


^ a b "IHO-IOC GEBCO Gazetteer" (PDF). International Hydrographic Organization/Intergovernmental Oceanographic Commission. September 2007. Archived from the original (PDF) on 2008-09-11. Retrieved 2008-05-24.  ^ "GPS Measurements Reveal Imprint of North American Plate
North American Plate
in Siberia", Earth Institute at Columbia University, 2003 ^ Robert A. Sohn, et al., "Explosive volcanism on the ultraslow-spreading Gakkel ridge, Arctic Ocean", Nature 453, 1236-1238 (26 June 2008) doi:10.1038/nature07075 http://www.nature.com/nature/journal/v453/n7199/full/nature07075.html (abstract) ^ http://www.ridge2000.org/dls/abstracts.php "The Arctic Gakkel Vents (AGAVE) Expedition: A High–Stakes Technology Gamble Pays Big Dividends Beneath the Arctic Ice Cap", Ridge 2000 Abstracts 2009

Kristen Watson, Mar. 2001, Evidence of Recent Volcanic Activity Found Along the Slow-Spreading Gakkel Ridge

See also[edit]


Further reading[edit]

Jokat, Wilfried, and Mechita C. Schmidt-Aursch. 2007. "Geophysical Characteristics of the Ultraslow Spreading Gakkel Ridge, Arctic Ocean". Geophysical Journal International. 168, no. 3: 983-998. doi:10.1111/j.1365-246X.2006.03278.x

External links[edit]

Polar Discovery: Gakkel Ridge AMORE 2001: Arctic Ocean "No hole at the Pole," Geology News "Discovery of abundant hydrothermal venting on the ultraslow-spreading Gakkel ridge in the Arctic Ocean," Nature NOAA SCIENTIST AND COLLEAGUES FIND HOT SPRINGS IN COLD WATERS Scientists to explore Arctic Ocean
Arctic Ocean

v t e

Mid-ocean ridges


Central Indian Chile East Pacific Explorer Gakkel Gorda Juan de Fuca Mid-Atlantic Pacific-Antarctic South American-Antarctic Southeast Indian Southwest Indian


Aegir Alpha Kula-Farallon Pacific-Farallon Pacific-Kula Phoenix

Coordinates: 84°N 1°W / 84°