Abstract
Large ultramafic bodies of the East Othris ophiolite in Central Greece consist of serpentinites, of harzburgite precursors, as well as serpentinized lherzolites, which have been intruded by thin dykes of olivine-rich and olivine-poor pyroxenites. They represent parts of partially altered upper mantle wedge rocks in a Mid-Late Jurassic intraoceanic subduction setting of the Pindos microocean, a western strand of the Tethyan oceanic realm. Serpentinization and rodingitization occurred during their exhumation toward the fore-arc oceanic region and accretionary prism through a subduction channel. Petrography and geochemistry show that protoliths of most serpentinites and serpentinized peridotites are harzburgites, while few are more fertile lherzolites. Petrogenetic modeling reveals that the former harzburgites correspond to highly depleted residual mantle peridotites, which formed after moderate degrees (~13–20 %) of hydrous partial melting, whereas lherzolites, being closely related to the ophiolitic mantle peridotites of West Othris, resulted after lower partial melting degrees (~7–10 %). Mineral chemistry and geochemical data from pyroxenites imply that they have been derived after crystallization of a subduction-related IAT hydrous magma that formed after moderate partial melting degrees (~14–19 %), quite similar to those that produced the harzburgites. Melting processes for the East Othris mantle peridotites occurred in the spinel-stability field, at estimated equilibrium temperatures ranging between 900 and 1,050 °C and pressures between 1.4 and 1.7 GPa, in a rather highly oxidized environment. It is estimated that the primary IAT magma, formed under relatively high temperatures with liquidus temperature at ~1,260 °C and mantle potential temperature at ~1,372 °C. Cooling rates of the shallow mantle beneath the Pindos oceanic basin, from its Mid-Triassic rift/drift phase and the subsequently developed Mid-Late Triassic short-lived intraoceanic subduction, to the Mid-Late Jurassic main subduction phase, are estimated at ~0.7 and ~1.6 °C/Ma, respectively, with the latter being considered as unusually high.
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Acknowledgments
We would like to express our sincerest thanks to Prof. Nikolay Bonev, to an anonymous reviewer and to the Editor in Chief Prof. Wolf-Christian Dullo for their constructive reviews, suggestions and critical comments, which significantly helped us to improve this paper. We gratefully acknowledge Prof. Theodoros Ntaflos (University of Vienna) for assisting with the use of electron microprobe facility and for beneficial discussions. We would like to express our appreciation to SARG (University of Athens) for covering part of field work expenses. Panagiotis A. Chrisanthopoulos (alumnus of Drexel University, PA, USA) is also acknowledged for aiding to improve the English text in the final version of the manuscript.
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Magganas, A., Koutsovitis, P. Composition, melting and evolution of the upper mantle beneath the Jurassic Pindos ocean inferred by ophiolitic ultramafic rocks in East Othris, Greece. Int J Earth Sci (Geol Rundsch) 104, 1185–1207 (2015). https://doi.org/10.1007/s00531-014-1137-z
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DOI: https://doi.org/10.1007/s00531-014-1137-z