By A. Nicolas
`This is a truly useful publication for either oceanographers and geologists attracted to the formation of oceanic crust and its accretion into continents. the writer has conscientiously undergone a lot of the literature in this topic, so the bibliography is very precious for these attempting to seize up or these simply beginning study within the field.'
Episodes, 13:1, 1990
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Extra info for Structures of Ophiolites and Dynamics of Oceanic Lithosphere
3b, c). The layer thickness is variable, usually in the 1-5 cm range. Layering in lherzolites is dominantly formed by ANALYTICAL METHODS IN OPHIOLITES 21 websterites and ariegites (Lensch, 1976), also called 'Cr-diopside' and 'AI-augite' pyroxenites by Wilshire and Shervais (1975). The websterites usually do not exceed 10 cm in thickness and the ariegites 100 cm. In harzburgites, the layering is more commonly formed by orthopyroxenites and dunites with rare chromitite layers. In contrast to dikes, layers are strictly parallel to one another.
1980) (see fig. 10 where V3 is equated with the 'Salahi episode' and V2, with the 'Lasail', 'Alley' and 'clinopyroxene-phyric' episodes). , 1988). , 1984). 1). 3. , 1986). 1 b). Statistical measurements made by Pallister (1981), Lippard et al. (1986) and our group to detect a preferred facing direction for the chilled margin of the dikes with a single chilled margin have not been very conclusive. The dikes are dominantly tholeiitic in nature, locally highly hydrothermally altered in the greenschist facies (see below).
1974) as derived from seamounts inside the Hawasina basin and by Graham (1980) and Searle and Graham (1982) as derived from intrusive horsts in the border of the continent and related 10 the rifting. 7) . The Hawasina fonnations record a progressive subsidence probably reflecting the post-Triassic thenna1 relaxation following the episooe of rifting and the transilion to an oceanic situation. The increased subsidence duri ng the MaIm (150 Ma) (Murris, 1980) could correspond to this transition (Ceuleneer, 1986).