Abstract
Serpentinized peridotites recovered at DSDP Site 395 preserve the original minerals: olivine, orthopyroxene, clinopyroxene, and chromian spinel. The estimated equilibration temperature indicates that they were equilibrated under upper-mantle conditions, and the compositions of constituent minerals indicate that they are residues left after removal of more fusible components as basaltic magmas. It is suggested, therefore, that they are the fragments of residual oceanic upper mantle, which were emplaced into oceanic crust as solid intrusion along faults. They are mineralogically similar to the ultramafic tectonites of ophiolite complexes; this supports the hypothesis that ophiolite complexes are generated at or near the mid-oceanic ridges and that their ultramafic tectonites represent the oceanic upper mantle.
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