Abstract
The Dinaride ultramafics occur as large and comparatively thin plates capping the associated Jurassic sediments with included diabase and spilite. Foliation within the massifs is mostly discordant to the structures in the neighboring sediments, and the tectonic contacts between them are common. Ultramafics are mostly "gneissoid" lherzolite containing olivine, enstatite and diallage of very uniform composition. The problem of modal and chemical composition of the Dinaride ultramafics is discussed in detail. Mineral assemblage of the Dinaride ultramafics when compared with data of experimental petrology is stable under upper mantle conditions. The Dinaride lherzolite represents typical tectonites and they were intruded as solid and hot blocks ± crystal mush. After breaking off from the upper mantle they were joined with eclogite-amphibolites and together equilibrated under PT conditions of eclogite-amphibolite facies. The lherzolite diapirs represented at higher levels a locus for gabbro intrusions. The Jurassic graywackes and shales, together with spilite and diabase, provided a locus for the final emplacement of the Dinaride lherzolite during a phase of subduction.
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