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KEFISSOS-KALLIDROMON : Über die Thermopylen in das Kallidromon-Gebirge und an den Golf von Korinth Fahrt zu den Thermopylen (140km). Kurzer Halt am Leonidas-Denkmal. Radtour auf aussichtsreichen Straßen quer durch das Kallidromon-Gebirge über den Fontana-Pass, 700m, zur Ebene des Böotischen Kefissos (35km, 800m Steigungen, Asphalt, C; es besteht auch die Möglichkeit, nur einen Teil der Radtour mitzumachen). Über Gravia und Amphissa, zwischen den Bergen Giona und Parnass geht es nun nach Itea am Golf von Korinth (70km). Zwei Übernachtungen   kallidromia gea Abstract: The Iti and Kallidromon ophiolites, in continental central Greece, consist mainly of an ophiolite mιlange overthrust by variably serpentinized ultramafic rocks. They include lherzolite and harzburgite; dunite pods occur within the lherzolite at Kallidromon. All rock types display typical textures of Alpine-type mantle rocks. Spinel, olivine and pyroxene compositions are similar to analogous phases from oceanic peridotites. The lherzolite contains an aluminous spinel. The dunite and harzburgite contain two compositional variants of Cr-rich spinel, both commonly present in zoned grains, one with higher Cr# and a second with lower Cr#. Linear variations of Al2O3, CaO, V and Ni with MgO, coupled with incompatible and rare-earth-element depletion and mineral compositions, suggest prior events of partial melting in both the lherzolite and harzburgite. The LREE enrichment in the harzburgite, as well as the development of Cr-rich spinel and tremolite and the PGE distribution in both the dunite and harzburgite, are consistent with a history of melt–peridotite interaction. The melt is considered to have been of boninitic composition, generated in the mantle wedge above a subduction zone. The harzburgite was formed at values of smaller melt:rock ratio relative to the dunite owing to partial assimilation of clinopyroxene and orthopyroxene from the host lherzolite. The dunite is considered to have been formed by assimilation of clinopyroxene and orthopyroxene, and replacement of Al-rich spinel by Cr-rich spinel, when locally ponded boninitic melts reacted with the host lherzolite. In both the harzburgite and dunite, subsequent differentiation of magma resulted in the formation of compositional areas poorer in Cr in the spinel grains. The involvement of a boninitic melt and the significant contribution of H2O in the formation of the harzburgite and dunite, along with mineralogical evidence, particularly Fo- and Cr-rich olivine in the dunite and high-Cr spinel in both the dunite and harzburgite, suggest a subduction-related regime for the origin of the Iti and Kallidromon ophiolites. Moreover, covariation of Cr/Al and Ni/Al values similar to the well-known SSZ-type ophiolites of Vourinos support the above hypothesis.Key words: ophiolite, ultramafic rocks, rare-earth elements, platinum-group elements, melt–peridotite interaction, Iti, Kallidromon, Greece.com 10 Νοέ 07, 14: