Sentences with phrase «spreading ridge»

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.

As the accreting (being added to) oceanic plates move away from the spreading ridge, they start to cool, and thus become more dense.

Look at a cross section of a spreading ridge.

At some point — maybe a 1000 miles away from the spreading ridge where it was born — a chunk of the plate becomes too dense for the underlying mantle to support.

Funded by the National Science Foundation, Ridge 2000 is «an interdisciplinary initiative to study the Earth's oceanic spreading ridge system as an integrated whole, from its inception in the mantle to its manifestations in the biosphere and water column.»

The findings bolster earlier studies of Europa's surface geology that found regions where the moon's ice shell looks to be expanding in a way that's similar to the mid-ocean spreading ridges on Earth.

So Olive and his team devised a new explanation: At fast - spreading ridges with abundant magma eruptions, the cooling, stretching crust forms new faults in rapid succession as it continues to spread.

Theissen - Krah, L. H. Rüpke, J. P. Morgan, K. Iyer, S. Petersen, C. W. Devey: Hybrid shallow on - axis and deep off - axis hydrothermal circulation at fast - spreading ridges,

Actually there were 4 geologists who found the magnetic anomalies on the sea floor at spreading ridges that set the stage for plate tectonics.

The largest change in ridge length of the past 100 My occurred ~ 60 to 50 Ma (57), associated with the opening of the Norwegian - Greenland Sea, a significant global reorganization of spreading ridges, and extrusion of 1 to 2 x 10» 6 km» 3 of basalts or the Brito - Arctic province (58).

Also, as I think about it, while the average rate of spreading at spreading ridges may only be about 2.5 cm per year, individual flows may well cover much larger areas.

The amount of magma coming trough the spreading ridges isn't amounting to much.

@Clyde Spencer February 20, 2017 at 9:05 am The numbers I found for magma erupting at spreading ridges are in the 2 - 5 km ^ 3 range per year range.

Clyde Spencer February 21, 2017 at 12:55 pm «Also, as I think about it, while the average rate of spreading at spreading ridges may only be about 2.5 cm per year, individual flows may well cover much larger areas.»

Not exact matches

Pour the batter into the prepared pan and with a rubber spatula spread the batter from the center outward, creating a slightly raised ridge around the outside rim (since heat is conducted faster near the metal rim, mounding the batter around the edges ensures the cake will bake more evenly and will be more leveled).

«The hypothesis that the floor of the oceans has been spreading seeks to explain some characteristics of ocean basins and the continents by supposing that material welling up from the interior of the earth forms mid-ocean ridges and then, as new material rises, moves outward, away from the ridges.

Virtually every room in this site, which consisted of 20 distinct little pueblos, ranging from 5 to 10 rooms to maybe 30 rooms, spread out over a long ridge, had been catastrophically burned.»

«Our data suggest that there are two other processes in the mantle that are stronger: one, the asthenosphere is clearly flowing on its own, but it's deeper and smaller scale; and, two, seafloor spreading at the ridge produces a very strong lithospheric fabric that can not be ignored.»

Macdonald says the process of continental plates spreading apart and filling in with magma is analogous to what happens on the deep seafloor at mid-ocean ridges, which are difficult to study because they lie a few kilometres under water.

The plume anomaly is consistent with partial melting, melt extraction, and remixing of hot rocks and is spreading north toward the mid-ocean ridge instead of, as projected, eastward with the migrating Nazca plate on which the island chain sits, says co-author Douglas R. Toomey, a professor in the UO's Department of Geological Sciences.

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.

New crust forms at midocean ridges where the sea floor spreads apart.

You will recall that hydrothermal vents are plumes of hot water that spew from rocks and cracks along the ocean floor, especially in regions of sea - floor spreading, such as oceanic ridges and rift valleys.

The team describes newly discovered geological and biological manifestations of hydrothermal activity at two sites on young abyssal hills flanking the East Pacific Rise, a fast - spreading portion of the global mid-ocean ridge system.

Midocean ridge spreading does not occur universally, especially in Iceland and the North Pacific basin.

At mid-ocean ridges, plates are spreading apart and magma rises to fill the gaps.

Here, you'll be treated to a timeless spread of gorges, ridges and lofty escarpments — a bush - hiking paradise, though serious walkers should come between May and October, when temperatures are coolest; during the Australian summer the mercury rises above 40 °C.

Manuel Antonio is spread along the ridge of the top road from Quepos to the Manuel Antonio National Park and is surrounded by dense jungle filled with exotic wildlife and -LSB-...]

The extending reef ridges are the outmost tips of Bali; spreading out from Garden Eels on the steep slope to the maximum depth of 35 meters is gorgeous and healthy reef with variety of macro sea life and large pelagic fish.

Changes in sea floor spreading rates effect the volume of the mid-oceanic ridges which may contribute to changes in the volume of the ocean basins.

It is expected that the turbines will be spread along several of ridge - lines.

For instance, the supposition that mid-oceanic ridges are the site of upwelling and trenches are that of sinking of the large scale convective flow can not be valid, because it is now established that actively spreading, oceanic ridges migrate and often collide with trenches» 14.

Part of the topographic elevation of mid-ocean ridges can be attributed to thermal uplift, and it follows that if the spreading rate increases, the amount of thermally - uplifted crust increases, at the expense of basin «room», causing a direct displacement of seawater.

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.

Magmatism and amagmatic seafloor generation at the ultraslow - spreading Gakkel ridge, Arctic Ocean.

However the eastern trough is predicted to slide into the northwestern North Atlantic allowing the western ridge and high heights to spread eastward.

Unlike most other mid-ocean ridges, the East Pacific Rise as a whole has not moved east - west for 50 to 80 million years, even as parts of it have been spreading asymmetrically.