Sentences with phrase «in oceanic crust»

The gravity anomaly layer indicates different densities in the oceanic crust and continental crust.

The scarps are cliffs that expose and provide access to the subseafloor, without the need for drilling, making it easier to tease out what is living at depth in oceanic crust.

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

Not exact matches

@Aashish Loknath Panigrahi: Yes, there are some plates that only consist of oceanic crust (especially in the Pacific); but more relevant is that all the continental plates also have portions of oceanic crust.

The relatively low - density continental crust of the North Island, which sits on the Australian plate, is forcing the dense oceanic crust on the Pacific plate beneath it in a process called subduction.

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 leveIn 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 levein a layer of oceanic crust 6 to 10 miles below sea level.

As new oceanic crust is made in the spreading centers (the story went), it cools, fractures, and slips along faults, creating downward - dropped blocks that could be responsible for the ridge - and - valley topography.

«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.

Generally speaking, there are two types of crust on Earth: a lighter continental crust that is rich in silicon and constitutes the dry land above sea level, and a denser oceanic crust where water gathers in the form of large oceans.

When the Pacific plate lunged beneath the islands in the first of those quakes, it left the oceanic crust under tension.

The northwest Pacific crust that is subducting in this area is some of the oldest, coldest oceanic crust subducting on Earth.

In particular, the researchers found that a higher ratio of uranium - 238 to uranium - 235 is incorporated into the modern oceanic crust, when compared to the uranium isotope signature found in meteoriteIn particular, the researchers found that a higher ratio of uranium - 238 to uranium - 235 is incorporated into the modern oceanic crust, when compared to the uranium isotope signature found in meteoritein meteorites.

Only during the second marked increase in atmospheric oxygen content 600 million years ago did the deep ocean become fully oxidised, which allowed the oceanic crust to gain the «fingerprint» of high uranium - 238.

Study co-author Heye Freymuth of the University of Bristol explains: «Although uranium was incorporated into the oceanic crust since the initial rise in atmospheric oxygen about 2.4 billion years ago, the ocean crust did not incorporate higher amounts of uranium - 238 as the oceans did not yet have adequate supplies of oxygen.»

In high - pressure and high - temperature X-ray measurements that were partly conducted at DESY, scientists created conditions similar to those in so - called subduction zones where an oceanic plate dives under the continental crusIn high - pressure and high - temperature X-ray measurements that were partly conducted at DESY, scientists created conditions similar to those in so - called subduction zones where an oceanic plate dives under the continental crusin so - called subduction zones where an oceanic plate dives under the continental crust.

With the oceanic plate, water enters the earth as it is trapped in minerals of the oceanic crust or overlaying sediments.

«This study is the first geophysical observation that large magma chambers exist in the deep oceanic crust below.»

«These superdeep diamonds contained much less carbon - 13, which is most consistent with an origin in the organic component found in altered oceanic crust.»

Older crust in turn is then forced back down into the Earth's mantle in places where a continental plate meets an oceanic plate.

Carbonates are important constituents of marine sediments and are heavily involved in the planet's deep carbon cycle, primarily due to oceanic crust sinking into the mantle, a process called subduction.

So yes, Rapa Nui sits way out in the ass end of nowhere, atop a seamount that has formed via the Easter hotspot, an upwelling of magma below the oceanic crust that has generated a range of undersea mountains (the Nazca Ridge) as the Nazca Plate drifted above it....

The consensus is that several factors are important: atmospheric composition (the concentrations of carbon dioxide, methane); changes in the Earth's orbit around the Sun known as Milankovitch cycles (and possibly the Sun's orbit around the galaxy); the motion of tectonic plates resulting in changes in the relative location and amount of continental and oceanic crust on the Earth's surface, which could affect wind and ocean currents; variations in solar output; the orbital dynamics of the Earth - Moon system; and the impact of relatively large meteorites, and volcanism including eruptions of supervolcanoes.

«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.

This end - member process stands in contrast to the «gabbro glacier» hypothesis, in which all oceanic plutonic rocks crystallize in a single, shallow melt lens and undergo ductile flow downward and outward to «fill» the lower crust.

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.

izen says (I am just quoting one of his letters to nature that he quoted to me) The circulation of seawater through newly formed ocean crust at mid-ocean ridge spreading centres is important in the oceanic heat and chemical budgets.

That would have required more knowledge, in particular, of the nature of the oceanic crust and seismology than would become available until the 1950s.