Exclusive: Drilling below the seabed in the mid–Atlantic Ocean, researchers have collected an unprecedented amount of mantle rocks.
, which serves as an energy source for microbial life at the “Lost City,” a nearby complex of ocean-bottom mineral chimneys deposited by gushers of superheated water.
So the ship returned to another site near Lost City, where shallow cores drilled in 2015 had found what appeared to be mantle rocks highly altered by seawater. After punching through a horizontal fault near the seabed, “the drilling just went so magically well,” says Andrew McCaig, a geologist at the University of Leeds and the cruise’s other chief scientist. The only hiccup came when the recovered peridotite rocks contained veins of asbestos, prompting increased safety protocols.
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