The Southeast Indian Ridge has a complex driving force which is due to the interaction of the Amsterdamn-St . Paul Plateau, a developed hot spot in the western portion of the Southeast Indian Ridge, and the mid-oceanic ridge ( MOR ).
42.
Lherzolite is known from the lower ultramafic part of ophiolite complexes ( although harzburgite is more common in this setting ), from alpine-type peridotite massifs, from fracture zones adjacent to mid-oceanic ridges, and as xenoliths in kimberlite pipes and alkali basalts.
43.
Divergent boundaries are typified in the oceanic lithosphere by the rifts of the oceanic ridge system, including the Mid-Atlantic Ridge and the East Pacific Rise, and in the continental lithosphere by rift valleys such as the famous East African linear features perpendicular to the ridge axis.
44.
Because Wegener's publications were widely available in German and English and because he adduced geological support for the idea, he is credited by most geologists as the first to recognize the possibility of continental drift . During the 1960s geophysical and geological evidence for seafloor spreading at mid-oceanic ridges established continental drift as the standard theory or continental origin and an ongoing global mechanism.
45.
The second piece of evidence in support of continental drift came during the late 1950s and early 60s from data on the bathymetry of the deep ocean floors and the nature of the oceanic crust such as magnetic properties and, more generally, with the development of marine geology which gave evidence for the association of seafloor spreading along the mid-oceanic ridges and magnetic field reversals, published between 1959 and 1963 by Heezen, Dietz, Hess, Mason, Vine & Matthews, and Morley.
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