Continental and Oceanic Rifts by G. P?lmason

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By G. P?lmason

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Published by means of the yank Geophysical Union as a part of the Geodynamics Series.

During the earlier decade of the overseas Geodynamics software many guides facing particular rift parts of the Earth's floor have seemed. such a lot of them symposia that have been held within the respective rift zones. one of the rifts hence taken care of are the Rhinegraben, Afar, Iceland, the Baikal rift, the Oslo paleorift, the Rio Grande rift and the lifeless Sea rift. in addition, guides facing reports of the sea flooring have mentioned many oceanic rift parts.


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Conditions for serpentinisation may occur also without existing faults. Lines of partially serpentinised rocks may form at the wake of every spot on the ridge where the lava fails to rise fast enough to create new ocean floor at the average pace of the spreading. Such a retardation may occur in oblique segments which provide narrower or above points is lower, where the cases lines or channels where the where minerals of FREUND Copyright American Geophysical Union for the rise of the lava, temperature of the mantle the water are more depressed content is refractive.

Many strike slip faults run along narrow deep valleys (hence their being called rifts) whose origin is probably not tensional as the two sides dip steeply toward the fault. The origin of these V-shaped fault structures (b) is not Rift known so Valleys with far. Oblique Motion movement at the Right lateral early stages motion along rift with associated evidence (Harland, 1971) for the varies "transtensional" in kind and in structures degree 1965) Fig. 3. A model proposed to explain uplift with the rifting of the Albert a step-like 36 fault rotation of the and to conform with other features in Afar (Mohr, 1968).

1978; Solonenko, 1978). , 1978). The evolution of the rift system and its sedimentary basins appears to have come in two major stages. The earlier stage of Eocene to early Pliocene age is characterized by slow plastic de- formation of the basement, while the later stage, from middle Pliocene to Recent, was dominated by rapid deformation and faulting (Logatchev and Florensov, The high 1978). seismicity of the rift offers excellent opportunity to study the stress field from solution of earthquake focal mechanism.

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