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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
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Medientyp |
Artikel
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Sprache |
Englisch
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Digitales Dokument |
PDF |
Erschienen |
In: GRA - Volume 17 (2015) |
Datensatznummer |
250106891
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Publikation (Nr.) |
EGU/EGU2015-6570.pdf |
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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 |
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