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Like a mosquito tunneling into the skin to get at the rich feast within, geologists poked a long, narrow drill into Earth's crust last year, pulling out a treasury of geological goodness.1,268 meters in length. Made up of igneous rock that has been chemically altered by seawater in a process known as serpentinization, the cylinder has now been analyzed and its secrets revealed.
But drilling a deep hole at the bottom of the ocean at a tectonic boundary heated by volcanism, as you might imagine, is far easier said than done. Previous efforts have yielded a hole no deeper than 200.8 meters – and of the material drilled, only 47 percent was recovered. Interestingly, the researchers found that their core sample had become highly serpentinized, with even the least-altered peridotite being at 40 percent transformed, for the entire length of the sample, suggesting that seawater penetration is pretty high. In spite of this, though, the primary rock composition was preserved better than shallower cores, revealing new information about the mantle beneath the Atlantis Massif.
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