In the NW sector of the Aegean Arc a volcanic activity occurred since 3 m.y. up to 0.5 m.y. B. P. It is made up by a few lava flows and domes which display a high-K calc-alkaline composition and high degree of enrichment in LILE, REE show a strong overall fractionation with highly fractionated LREE and poorly fractionated or unfractionated HREE patterns. The basaltic-like mineralogical composition, the variable bur generally high Mg-value, Ni and Cr contents together with the high LIL element enrichment shown by many of the studied rocks agrees with the hypothesis that these volcanics are the products of low degree of partial melting of the mantle wedge overlying the Beniof zone, which has been previously enriched in LILE. The high-K calc-alkaline character of the NW Aegean Arc volcanics is in agreement with its inner position in respect to the front arc calc-alkaline belt. Its apparent concentration on the western margin of the Aegean plate is related to the strong crustal stretching which has affected the western and eastern sides of the Aegean plate as a consequence of its southwestward motion.

Inner arc volcanism in NW Aegean arc: geochemical and geocrhonological data

PECCERILLO, Angelo;POLI, Giampiero
1977

Abstract

In the NW sector of the Aegean Arc a volcanic activity occurred since 3 m.y. up to 0.5 m.y. B. P. It is made up by a few lava flows and domes which display a high-K calc-alkaline composition and high degree of enrichment in LILE, REE show a strong overall fractionation with highly fractionated LREE and poorly fractionated or unfractionated HREE patterns. The basaltic-like mineralogical composition, the variable bur generally high Mg-value, Ni and Cr contents together with the high LIL element enrichment shown by many of the studied rocks agrees with the hypothesis that these volcanics are the products of low degree of partial melting of the mantle wedge overlying the Beniof zone, which has been previously enriched in LILE. The high-K calc-alkaline character of the NW Aegean Arc volcanics is in agreement with its inner position in respect to the front arc calc-alkaline belt. Its apparent concentration on the western margin of the Aegean plate is related to the strong crustal stretching which has affected the western and eastern sides of the Aegean plate as a consequence of its southwestward motion.
1977
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11391/915721
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