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Compositional heterogeneity in subduction-related mantle peridotites, Troodos massif, Cyprus

¹ Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, Kosygin Street, 19, Moscow, 117975, Russia, and Max-Planck-Institut für Chemie, Postfach 3060, 55020 Mainz, Germany

Geochemical mapping has revealed the presence of two distinct units within the mantle section of the Troodos massif, Cyprus. The first unit (U1) is composed of spinel lherzolite (Cr# [Cr/(Cr+Al)] of chrome spinels = 0.22–0.28), which contains numerous dunite bodies accompanied by zones of clinopyroxene-bearing harzburgite (U1-harzburgite). The second unit (U2) mainly consists of refractory clinopyroxene-poor harzburgite (U2-harzburgite; Cr# of chrome spinels = 0.51–0.70). The U1 spinel lherzolite is interpreted as residue after mid-ocean ridge basalt extraction, which was tectonically juxtaposed with U2. It was not involved in production of suprasubduction-type Troodos magmas, but has subsequently been modified by their percolation. The dunite bodies and related zones of U1-harzburgite might represent pathways of these melts in the mantle. The U2-harzburgite could have resulted from reaction between host rock and melts.

Key Words: lherzolite • harzburgite • clinopyroxene • trace elements • SIMS • modeling

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