Changes In Direction Of Sea Floor Spreading

As upwelling of magma continues the plates continue to diverge a process known as seafloor spreading.

Changes in direction of sea floor spreading.

The new rock is dense but not as dense as the old rock that moves away from the ridge. The differences in spreading rates affect not only the geometries of the ridges but also the geochemistry of the basalts that are produced. Magnetic anomalies and fracture zones make distinctive patterns when the direction of sea floor spreading changes as has occurred repeatedly in the north eastern pacific. These age data also allow the rate of seafloor spreading to be determined and they show that rates vary from about 0 1 cm 0 04 inch per year to 17 cm 6 7 inches per year.

Citations dimensions citation 278 dimensions. To approximately 5 5 m y b p followed by a decrease in rate to 1 7 cm yr 1 relative to the vine 1966 magnetic reversal model based on the south pacific. Changes in direction of sea floor spreading. When the molten magma reaches the oceanic crust it cools and pushes away the existing rocks from the ridge equally in both directions.

About this attention score above average attention score compared to outputs of the same age 64th percentile mentioned by wikipedia 1 wikipedia page. The mode of deformation is such that the spreading centres between transform faults become uniformly reoriented essentially perpendicular to the faults. The rotation hypothesis predicts a smoot. Samples collected from the ocean floor show that the age of oceanic crust increases with distance from the spreading centre important evidence in favour of this process.

Since the new oceanic basins are shallower than the old oceanic basins the total capacity of the world s ocean basins decreases during times of active sea floor spreading. Zconvergent plate boundaries when a plate of dense oceanic lithosphere moving in one direction collides with a plate moving in the opposite direction one of the plates subducts beneath the other. Rotation and propagation have both been proposed as mechanisms by which spreading centers can reorient following changes in direction of seafloor spreading. A younger oceanic crust is then formed causing the spread of the ocean floor.

Thus the depth to the sea floor increases with increasing age away from the ridge. Overview of attention for article published in nature august 1968. The only spreading history that was consistent will all the profiles required spreading at approximately 2 2 cm yr 1 from 11 m y b p.