They dug at a special “tectonic window” in the North Atlantic where the rocks of the mantle have been pushed close to the surface.
Andrew McCaig, the expedition’s co-chief scientist, said he was surprised that the drill yielded tube after tube of“It just kept going deeper, deeper and deeper. Then everyone in the science party said, ‘Hey, this is what we wanted all along. Since 1960, we wanted to get a hole this deep in mantle rock,’” McCaig told theThe team managed to get rock samples from as deep as 4,157 feet below the seafloor.
“Think of the crust in the way that you have a beautifully iced cake, but what you want is the cake, not the icing,” said Jessica Warren, a professor of Earth sciences at the University of Delaware who has also been monitoring the project’s progress remotely.Initial reports indicated that newly-extracted rock cores are dominated by peridotite, the most common type of rock in the upper mantle.
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