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Titel Thermal evolution from Triassic to Jurassic of the upper mantle beneath the Pindos Ocean as implied by ultramafic rocks in East Othris, Greece
VerfasserIn Petros Koutsovitis, Andreas Magganas
Konferenz EGU General Assembly 2015
Medientyp Artikel
Sprache Englisch
Digitales Dokument PDF
Erschienen In: GRA - Volume 17 (2015)
Datensatznummer 250106891
Publikation (Nr.) Volltext-Dokument vorhandenEGU/EGU2015-6570.pdf
 
Zusammenfassung
The East Othris ophiolite ultramafic members consist of serpentinites, as well as serpentinized harzburgites and lherzolites, intruded by thin dykes of olivine-websterites, websterites and clinopyroxenites. This ophiolite sequence represents parts of partially altered upper mantle wedge rocks in a Mid-Late Jurassic intraoceanic subduction setting of the Pindos micro-ocean in the western Tethys. Petrogenetic modelling[1,2,3] of geochemical and mineral chemistry data[4] reveal that the serpentinized harzburgites (Mg#=88.59-90.42; Al2O3=0.69-1.25 wt.%; Yb=0.06-0.10 ppm, Dy=0.07-0.15 ppm; Spinel cores Cr#=38.22-67.04) correspond to highly depleted residual mantle peridotites which were formed after moderate degrees (~13-20%) of hydrous partial melting, whereas serpentinized lherzolites (Mg#=90.37; Al2O3=1.98 wt.%; Yb=0.14 ppm, Dy=0.14 ppm; Spinel cores Cr#=18.03