Abstract
Introduction. Peridotites of the Troodos ophiolite complex are represented by highly depleted harzburgite (e.g. Gass, 1990; Greenbaum, 1977). Recently we found spinel lherzolites between Amiandos mine and Pashi Livadia as a rock body at least 3 km in largest dimension, apparently the same rock type previously described as high-Al harzburgite (Duncan & Green, 1987). The spinel lberzolites are characterized by slightly depleted mineral composition similar to Mid Oceanic Ridge peridotites (MORP). Petrography and mineral composition of peridotites. Troodos peridotites are tectonites with protogranular or porphyroclastic textures typical of residual mantle peridotites (Mercier & Nicolas, 1975). Spinel Lherzolite. 70-75% olivine (O1) (Fo 90.5-91), 15-20% orthopyroxene (Opx) (Mg# 90-91), 5-7% clinopyroxene (Cpx) (Table 1) and 1-2% Cr-A1 spinel (Sp) (Cr/(Cr + AI) = 0.28-0.45). Cpx occurs as deformed irregular grains (1.5-2.5 mm) with Opx exsolution lamella. Cpx-bearing harzburgites (2-3% Cpx) are closely associated with spinel lherzolite and have transitional mineralogy. Vernadsky Institute of Geochemistry, RAS, Kosigin St., 19, Moscow 117975, Russia. Dept. Volcanology and Petrology, GEOMAR Research Center, Wischhofstr. 1-3, D-2300 Kiel, Germany
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