Sentence examples for old oceanic from inspiring English sources

The puzzle pieces include the few remaining bits of Panthalassic ocean floor, rocks scattered along western North America, and remnants of the old oceanic crust seen under the continent, where the plate disappeared into the mantle, the layer of Earth beneath the crust.

One theory proposes that the relative youth of modern oceanic lithosphere, which is less than 200 million years old, supports the notion that old oceanic lithosphere becomes gravitationally unstable (denser) with age and that it spontaneously subducts.

In all those places especially, the early Archean evolution was dominated by intrusions of granodiorite that largely represented subduction-related magmatism and by the formation and deformation of greenstone belts that are probably relicts of old oceanic crust and mantle and immature (i.e., basalt-rich) island arcs.

Old oceanic lithosphere is generally believed to be thicker than younger oceanic lithosphere because of cooling over time.

The former one is a layered structure below the Pacific plate (PAC), representing the old oceanic plate.

Therefore, the possibility of anisotropy should not be ruled out for the old oceanic mantle in our study areas.

Rising currents have apparently occurred largely in oceanic areas, bringing new mantle material to the surface in the oceans and sweeping older oceanic rocks towards and perhaps beneath the high-standing continents.

Subduction preferentially consumes the oldest oceanic crust, so that the average age of oceanic crust becomes younger.

Many ophiolites are much older than the oldest oceanic crust, demonstrating continuity of the formation processes over hundreds of millions of years.

These rocks are mostly shales, sandstones, and limestones, while igneous rocks (such as the ophiolites of the northern Apennines, the remains of an older oceanic crust) are scarce.

The northwestern part of the Pacific Plate is composed of some of the oldest oceanic lithosphere on the planet.