Pre-Neogene nappe structure and metamorphism of the North Sporades and the southern Pelion peninsula

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Abstract
Summary: On the North Sporades and on the southern Pelion Peninsula, four tectonic units can be distinguished. The lowermost is the Pelagonian Nappe which is a sequence of Permo-Triassic metaclastics and platform carbonates of Middle Triassic to Upper Jurassic age. It is overlain by the Eohellenic Nappe, which consists of a melange with ophiolite bodies and crystalline slices, followed by a series of calc-schists, platy marbles and spilites, and, finally, a flyschoid sequence. Subsequent to the overthrusting of the Eohellenic Nappe in the Early Cretaceous, both nappes were partly eroded and then covered by the meso-autochthonous sediments of Middle Cretaceous to Lower Tertiary age. In the Eohellenic Nappe, as well as in the higher units, blue amphiboles often appear, i.e., magnesio-riebeckite in quartzitic and phyllitic layers and crossite or glaucophane in metabasites. The pelitic layers contain phlogopite and stilpnomelane as well as chlorite and phengite. In meta-radiolarites, spessartine and piemontite have also been found. This association, indicating high pressure during very low-grade metamorphism, contrasts greatly with the albite-biotite-almandine assemblage in the underlying Pelagonian Nappe, which is typical of low-grade metamorphism at more moderate pressures. A geodynamic explanation is proposed.

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