Sentences with phrase «from oceanic crust»

Magma that's mostly from the deeper mantle, however, doesn't produce a lot of lithium, neither does magma melted from oceanic crust.

This suggests that the MORBs contain a «fingerprint» of the uranium from the oceanic crust, drawn down from the surface and into the upper part of Earth's mantle through subduction, according to Andersen.

Not exact matches

Apr. 24, 2013 — Scientists have long believed that lava erupted from certain oceanic volcanoes contains materials from the early Earth's crust.

New research from a team including Carnegie's Erik Hauri demonstrates that oceanic volcanic rocks contain samples of recycled crust dating back to the Archean era 2.5 billion years ago.

But an open question is whether the flood also tore through the eastern Mediterranean, over a seafloor cliff separating the shallower continental crust in the west from the deeper oceanic crust in the east.

In the months before an October 2011 eruption, magma from the upper mantle accumulated in a layer of oceanic crust 6 to 10 miles below sea level.

«When crust from an oceanic tectonic plate plunges beneath a continental tectonic plate, as it does beneath the Andean Plateau, it brings water with it and partially melts the mantle, the layer below Earth's crust,» said Rice University's Jonathan Delph, co-author of the new study published online this week in Scientific Reports.

Its strength resulted from the abrupt release of plate tectonic forces, a process known as subduction, centered on an area beneath Honshu where it slides over the top of oceanic crust.

That recycling of Earth's surface leads to the separation of light - colored continental crust (exposed here at Yosemite National Park's Half Dome) from darker, denser oceanic crust.

Trapped and under great pressure and heat, the water was released from the oceanic plate and moved up through the mantle and toward the lower crust.

Magma from the mantle forms oceanic crust when it rises from the mantle to the surface at spreading centers and cools into the rock that forms the very bottom of the seafloor.

Among the data used by the model was the heat distribution in the oceanic crust, which is known from seismic studies.

As a result, mantle plumes entrain a variable combination of relatively young oceanic crust directly from the subducting slab, older oceanic crust that has been stirred with ancient more primitive material and background, depleted mantle.

These islands are so - called «hot - spots» with lava formed from hot mantle plumes that up - well beneath the oceanic crust.

The oceanic crust moves away from the mid-ocean-ridges and ultimately gets transported back into the underlying mantle through «subduction» at ocean trenches.

The zircons from Mauritius, it turned out, were hundreds or even thousands of millions of years old, although the island's oceanic crust was less than 10 million years old.

This, researchers say, suggests that a significant proportion of the oceanic crust alterations long attributed to a chemical - physical process may stem from a biological one.

But volcanoes were still spewing into the atmosphere large amounts of carbon from recycled oceanic crust.

«Our findings suggest that the primordial crust involved in forming our craton was actually more than 4.2 billion years old and similar in composition to oceanic crust, which is very different from continental crust,» O'Neil said.

Researchers from the Centre for Arctic Gas Hydrate, Environment and Climate (CAGE) at the Arctic University of Norway have discovered a growing Arctic abiotic methane - and methane hydrate — charged sediment drift on oceanic crust in the deep Fram Strait of the Arctic Ocean.

Beginning about 50 million years ago (and continuing to the present day), the drift of the continental plates has caused the continents of India and Eurasia to collide, pushing up oceanic crust from the bottom of the sea to form the Himalayan mountain chain and the Tibetian plateau.