By Tj. Peters, A. Nicolas, R. Coleman
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Extra resources for Ophiolite Genesis and Evolution of the Oceanic Lithosphere: Proceedings of the Ophiolite Conference, held in Muscat, Oman, 7–18 January 1990
And R. Batiza, 1986. Petrologic and tectonic segmentation of the East Pacific Rise, 5°30'-14°30'N, Nature, 322: 422-426. , 1983. The process of formation of ocean crust, Science, 220: 151-157. R. D. Garmany, 1982. Constraints on the structure of the East Pacific Rise from seismic refraction data, J. Geophys. , 87: 8,417-8,425. , 1989. atomy of the magma reservoir, Nature, 339: 178-179. , 1982. Mid-ocean ridges: Fine scale tectonic, volcanic and hydrothermal processes within the plate boundary zone, Ann.
2(A) and 2(B). (Figure 4). In this sense, the high level gabbros merit the name of 'plated gabbros'. When approaching the base of the sheeted dike unit several observations can be made in many sections of the Oman ophiolite. The foliation becomes progressively weaker and, commonly, very difficult to pick up in the field, thus explaining why such gabbros have been described as 'isotropic' or 'massive'. Some vague layering, often anorthositic, can be observed, parallel to the foliation. - Structurally, the foliation tends to become parallel to the dikes of the sheeted dike unit in the root zone of this unit.
New seismic images of oceanic crustal structure. Geology, 18: 462-465. , 1965. A new class of faults and their bearing on continental drift. Nature, 207: 343-347. A. , 1989. Tectonics of the Mid-Atlantic Ridge Rift Valley between the TAG and MARK areas (26°24°N): Evidence for vertical tectonism. Tectonophysics, 159: 1-23. Rooting of the Sheeted Dike Complex in the Oman Ophiolite A. NICOLAS AND F. BOUDIER* • Laboratoire de Tectonophysique, URA 1370 CNRS, Universite Montpellier II, Pl. Bataillon 34060 Montpellier, France Abstract The root zone of the sheeted dike complex representing a thin zone (hundred meters thick) of extreme thermal gradient (~5°C/m) is regarded as a thermal boundary between the convective magma chamber system below, and the main convective hydrothermal circuit which closes above, at the base of this root zone.