Changes In Direction Of Sea Floor Spreading

A younger oceanic crust is then formed causing the spread of the ocean floor.

Changes in direction of sea floor spreading.

According to recent restorations le breton et al. As upwelling of magma continues the plates continue to diverge a process known as seafloor spreading. The new rock is dense but not as dense as the old rock that moves away from the ridge. 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.

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. Citations dimensions citation 278 dimensions. 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.

The mode of deformation is such that the spreading centres between transform faults become uniformly reoriented essentially perpendicular to the faults. 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. The differences in spreading rates affect not only the geometries of the ridges but also the geochemistry of the basalts that are produced. 2012 variations in the amount and direction of sea floor.

When the molten magma reaches the oceanic crust it cools and pushes away the existing rocks from the ridge equally in both directions. 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. About this attention score above average attention score compared to outputs of the same age 64th percentile mentioned by wikipedia 1 wikipedia page. 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.

Downloaded from the amount and rate of sea floor spreading in the ne atlantic. Thus the depth to the sea floor increases with increasing age away from the ridge. 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.