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- W1969086871 abstract "The internal structures of eleven ophiolite complexes have been structurally investigated. The attitude of the foliation and the lineation in the peridotites is related to asthenospheric flow in the uppermost mantle at an oceanic spreading center. From the orientation of these structures with respect to the paleohorizontal plane, two oceanic situations are distinguished. The horizontally spreading asthenosphere illustrated by the Table Mountain massif (Newfoundland) is characterized by: (a) homogeneous, regular and sub-horizontal plastic flow pattern: over large distances; (b) flat paleo Mono and absence of large scale folding; (c) rare economical chromite deposits and depleted mantle. (a) inhomogeneous and sub-vertical plastic flow pattern; b) deformed paleo Moho and large scale folds; (c)important economical chromite deposits and less depleted mantle, presumably due to secondary magmatic impregnation. This leads to Vogt's model of asthenospheric flow beneath an oceanic ridge (the direction of which being equated with the dike swarm). In this model the horizontally spreading asthenosphere is derived from the diapirically spreading one in the following way. The vertical mantle flow at the diapir center diverges horizontally, in every direction including that parallel to the ridge. At about 50 km from the diapir center the mantle flow becomes progressively perpendicular to the ridge due to the damming effect of transform faults. An important economical consequence of this model is that large chromite deposits are expected preferentially in the diapiric type of ophiolite because chromite is preferentially precipitated at the diapir center from pristine magma." @default.
- W1969086871 created "2016-06-24" @default.
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- W1969086871 date "1982-01-01" @default.
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- W1969086871 title "Mantle flow at oceanic spreading centers: Models derived from ophiolites" @default.
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- W1969086871 doi "https://doi.org/10.1016/0040-1951(82)90136-6" @default.
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