Since the late 1970s, it has been increasingly recognized that the petrology and geochemistry of ophiolites predominantly resemble those of lithological units from intra-oceanic subduction zones, ranging from nascentand fore-to intra-or back-arcs, ruling out analogy with modern oceanic ridge lithosphere. This conclusion is

The waning stage(s) of the Tethyan ocean(s) in the Balkans are not well understood.

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The study reports petrography and mineral chemistry data about an ultramafic vein that cuts the Rabrovo serpentinite (near Valandovo, Southern Macedonia). The serpentinite occurs as a block within a shearing zone of the East Vardar Zone tectonic mélange. The vein corresponds to medium-grained olivine websterite that sometimes displays cumulate-like textures. It is composed of low-Al orthopyroxene (Mg#[mol MgO*100/(MgO + FeO o C. Its pyroxene-rich modal composition suggests that this rock cannot represent a normal lithospheric mantle. Instead, it is supposed that it was formed via magmatic precipitations in the mantle lithosphere. In addition, the Rabrovo olivine websterite shows similar mineral chemical compositions to many other orthopyroxene-rich lithologies worldwide, which origin is commonly associated with subduction settings. Therefore, its presence is considered as additional evidence that the East Vardar ophiolites represent typical supra-subduction ophiolites.