Mantle, comprising more than 80% of the planet's volume, rocks generally are inaccessible.
WASHINGTON - Scientists using an ocean drilling vessel have dug the deepest hole ever in rock from Earth 's mantle - penetrating 4,160 feet below the Atlantic seabed - and obtained a large sample that is offering clues about our planet's most voluminous layer.
Mantle rocks generally are inaccessible except where they are exposed at locations of seafloor spreading between the slowly moving continent-sized plates that make up the planet's surface. The core sample they recovered comprises more than 70% of the rock - 2,907 feet in length - from the hole they drilled.
"Previously, we have been largely limited to mantle samples dredged from the seafloor," Lissenberg added. The core sample has a diameter of about 2-1/2 inches . They documented how a mineral called olivine in the core sample had reacted with seawater at various temperatures. The drill site was located close to the Lost City Hydrothermal Field, an area of hydrothermal vents on the seabed spurting super-heated water. The core sample is thought to be representative of the mantle rock beneath the Lost City vents.
Rock Earth Mantle Mantle Research Scientists Mantle Rock
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