sea floor spreading takes place at mid-ocean ridges brainly.
sea floor spreading takes place at mid-ocean ridges brainly.
where does sea floor spreading take place brainly?
mid-ocean ridges
vine's phd thesis was on 'magnetism in the seafloor' and supervised by drummond matthews. having met harry hess he was aware of sea floor spreading, where the ocean bed acts as a 'conveyor belt' moving away from the central ridge. vine's work, with that of drummond matthews and lawrence morley of the geological survey of canada, helped put the variations in the magnetic properties of the ocean crust into context in what is now known as the vine–matthews–morley hypothesis. specifically they supported dietz's ("nature" 1961) idea that sea floor spreading was occurring at mid-ocean ridges. vine and matthews showed that basalt created at a mid-ocean ridge records earth's current magnetic field polarity (and strength), thus turning hess's theoretical 'conveyor belt' into a 'tape recorder'. furthermore, they showed that magnetic reversals 'frozen' into these rocks, as suggested by allan cox ("nature" 1963), can be seen as parallel strips as you travel perpendicularly away from the ridge crest.
frederick vine
pangea started to break up during the triassic ≈225ma. rifting affected regions which became the central atlantic (between north america and africa) and the gulf of mexico at about the same time. this rifting created a divergent plate margin that would play an integral role of the future geologic processes to follow. rifting which involves the stretching of pre-existing crust and mantle lithosphere was initiated by the existence of sufficient horizontal deviatoric tensional stress that broke the lithosphere. eventually rifting gave way to sea floor spreading in the atlantic and gulf of mexico in the mid jurassic, around ≈165 ma. sea floor spreading is where new oceanic lithosphere is being created by upwelling of material, unlike rifting where it only involved the stretching of the crust. convection currents in the sub-lithospheric mantle are the driving mechanisms that caused sea floor spreading to occur. new lithosphere is made when hot material beneath ocean ridges is brought to the surface by these cells. as the new lithosphere moves horizontally away from the ridges, the new crust added to the gulf of mexico and the atlantic caused the continents of north america and south america to be moved apart. seafloor spreading in the gulf of mexico ceased by the beginning of the cretaceous and spreading shifted to the proto-caribbean.
geology of the dallas–fort worth metroplex