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An exploration 3D seismic data set from the Gjallar Ridge off mid-Norway images a giant fluid seep structure, 3×5km wide, which connects to late Palaeocene magmatic sills at depth. Two of the pipes that have developed as hydrothermal vents reach all the way to the modern seafloor implying that they either were active much longer than the original hydrothermal activity or have been reactivated. We...
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