Rocks under the northern ocean are found to resemble ones far south

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The western portion of the Gakkel Ridge has been found to contain a geochemical signature until now known mainly from the Indian Ocean. Credit: IBCAO
The western portion of the Gakkel Ridge has been found to contain a geochemical signature until now known mainly from the Indian Ocean. Credit: IBCAO

Scientists probing volcanic rocks from deep under the frozen surface of the Arctic Ocean have discovered a special geochemical signature until now found only in the southern hemisphere. The rocks were dredged from the remote Gakkel Ridge, which lies under 3,000 to 5,000 meters of water; it is Earth’s most northerly undersea spreading ridge. The study appears in the May 1 issue of the leading science journal Nature.


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