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 Massive section of ocean floor off the coast of Portugal beginning to fracture

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PostSubject: Massive section of ocean floor off the coast of Portugal beginning to fracture   Tue Jun 18, 2013 6:59 am

Massive section of ocean floor off the coast of Portugal beginning to fracture
Posted on June 18, 2013 by The Extinction Protocol

Major geological shift for planet: NOAA/NGDC image of the Atlantic crustal age of the ocean floor. Geologists have detected the first evidence that a passive margin in the Atlantic ocean is becoming active. The team mapped the ocean floor and found it was beginning to fracture, indicating tectonic activity around the apparently passive South West Iberia plate margin.
June 18, 2013 GEOLOGY - A new subduction zone forming off the coast of Portugal heralds the beginning of a cycle that will see the Atlantic Ocean close, as continental Europe moves closer to America. Published in Geology, new research led by Monash University geologists has detected the first evidence that a passive margin in the Atlantic Ocean is becoming active. Subduction zones, such as the one beginning near Iberia, are areas where one of the tectonic plates that cover Earth’s surface dives beneath another plate into the mantle — the layer just below the crust. Lead author Dr João Duarte, from the School of Geosciences said the team mapped the ocean floor and found it was beginning to fracture, indicating tectonic activity around the apparently passive South West Iberia plate margin. “What we have detected is the very beginnings of an active margin — it’s like an embryonic subduction zone,” Dr Duarte said. “Significant earthquake activity, including the 1755 quake which devastated Lisbon, indicated that there might be convergent tectonic movement in the area. For the first time, we have been able to provide not only evidences that this is indeed the case, but also a consistent driving mechanism.” The incipient subduction in the Iberian zone could signal the start of a new phase of the Wilson Cycle — where plate movements break up supercontinents, like Pangaea, and open oceans, stabilize and then form new subduction zones which close the oceans and bring the scattered continents back together. This break-up and reformation of supercontinents has happened at least three times, over more than four billion years, on Earth. The Iberian subduction will gradually pull Iberia towards the United States over approximately 220 million years. The findings provide a unique opportunity to observe a passive margin becoming active — a process that will take around 20 million years. Even at this early phase the site will yield data that is crucial to refining the geodynamic models. “Understanding these processes will certainly provide new insights on how subduction zones may have initiated in the past and how oceans start to close,” Dr. Duarte said. –Daily Science
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