The Seafloor Spreading Hypothesis

When oceanic plates diverge tensional stress causes fractures to occur in the lithosphere.

The seafloor spreading hypothesis.

In 1965 a canadian geophysicist j. First proposed in the early 1960s by the american geologist harry h. This evidence was from the investigations of the molten material seafloor drilling radiometric age dating and fossil ages and the magnetic stripes. The motivating force for seafloor spreading ridges is tectonic plate slab pull at subduction zones rather than magma pressure although there is typically significant magma activity at spreading ridges.

In 1962 these ideas. Seafloor spreading as upwelling of magma continues the plates continue to diverge a process known as seafloor spreading. Seafloor spreading and other tectonic activity processes are the result of mantle convection. Seafloor spreading helps explain continental drift in the theory of plate tectonics.

Tuzo said that earth s crust or lithosphere was divided into large rigid pieces called plates. Harry hess s hypothesis about seafloor spreading had collected several pieces of evidence to support the theory. This evidence however was also used to support the theory of continental drift. Seafloor spreading theory of lithospheric evolution that holds that the ocean floors are spreading outward from vast underwater ridges.

Mantle convection is the slow churn ing motion of earth s mantle. 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. Hess like wegener ran into resistance because little ocean floor data existed for testing his ideas. These plates float atop an underlying rock layer called the asthenosphere.

This idea played a pivotal role in the development of the theory of plate tectonics which revolutionized geologic thought during the last quarter of the 20th century. Seafloor spreading is a geologic process in which tectonic plate s large slabs of earth s lithosphere split apart from each other. The seafloor spreading hypothesis scientists brought these observations together in the early 1960s to create the seafloor spreadinghypothesis. Hess its major tenets gave great support to the theory of continental drift continental drift.

In this hypothesis hot buoyant mantle rises up a mid ocean ridge causing the ridge to rise upward figurebelow. In 1959 he informally presented this hypothesis in a manuscript that was widely circulated. A mystery solved in 1912 when alfred wegener proposed that the continents had once been joined together and had split apart the biggest weakness in his hypothesis was the lack. Resulted in a ground breaking hypothesis that later would be called seafloor spreading.