Computer Science
Scientific paper
Dec 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985e%26psl..76...84b&link_type=abstract
Earth and Planetary Science Letters, Volume 76, Issue 1-2, p. 84-92.
Computer Science
58
Scientific paper
In most ophiolites the ultramafic section is harzburgitic. It is rarely composed of residual lherzolites, except for the local occurrence of impregnation lherzolites within harzburgitic massifs. Several characters (environmental formations, thickness and composition of the crust, geometry of the asthenospheric flow, serpentinization) validate the distinction between an harzburgite and a lherzolite ophiolitic subtype. The harzburgite subtype can be derived from any oceanic spreading center, provided the rate is larger than 1 cm/yr. The lherzolite subtype would correspond to situations (vicinity of transform fault, very slow spreading rates) where the lithospheric front penetrates at 20-30 km into the mantle below the spreading center. These lherzolitic massifs are best explained as being derived from slow-spreading rifts. Finally the particular asthenospheric flow discovered in these massifs is discussed.
Boudier Françoise
Nicolas Alain
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