Origin and evolution of sub-ophiolitic amphibolites from Angelona (SE Peloponneus, Greece), and their significance within the Pindos Ocean

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Authors:Hatzipanagiotou, Konstantin; Tsikouras, Basilios
Author Affiliations:Primary:
University of Patras, Section of Earth Materials, Patras, Greece
Volume Title:Periodico di Mineralogia
Source:Periodico di Mineralogia, 72(3), p.13-33. Publisher: Istituto di Mineralogia dell'Universita di Roma, Rome, Italy. ISSN: 0369-8963
Publication Date:2003
Note:In English with Italian summary. 65 refs.; illus., incl. 3 tables, geol. sketch map
Summary:Two geochemically distinct groups of amphibolites have been found both as fragments in an ophiolite melange and as a remnant subophiolitic metamorphic sole at the base of the Angelona ophiolite sequence. Group-1 shows T-MORB and group-2 WPB geochemical signatures. Basaltic fragments, considered to represent the amphibolitic protoliths in the ophiolite melange, also show twofold chemistry and are divided in two groups with affinities similar to the amphibolites. The WPB rocks are similar to rift-related Triassic lavas from Pindos, Koziakas and Argolis, thus suggesting the operation of Triassic rifting in Angelona. The T-MORB rocks suggest that the ophiolite was generated in a typical oceanic environment, which was slightly influenced by the contribution of a mantle plume component. Geochemical and age constraints point to the hypothesis that the Angelona ophiolite is the link between the continental Hellenides to the North, and the Crete ophiolite, to the South within the Pindos ocean. The metamorphic evolution of the two amphibolite groups occurred at around 450-500°C and 500-550°C, respectively, at estimated pressures at approximately 6-8 MPa. A reaction series, which is possibly related to the amphibolite formation, suggests that metamorphism occurred during pressure increase and cooling, conditions analogous to other amphibolite subophiolitic metamorphic soles.
Sections:Mineral data; Petrology
Subsections:Metamorphism: regional, dynamic; Oceanic petrology; Silicates
Mineral Groups:Double-chain silicates
Subjects:Amphibolites; Anisian; Basalts; Chemical composition; Chemical ratios; Clastic rocks; Dikes; Electron probe data; Flysch; Gabbros; Geochemistry; Igneous rocks; Intrusions; Lithostratigraphy; Magmatism; Major elements; Melange; Mesozoic; Metamorphic rocks; Metamorphism; Mid-ocean ridge basalts; Middle Triassic; Mineral assemblages; Mineral composition; Models; Ophiolite; P-T conditions; Paleoenvironment; Paleogeography; Petrology; Plate tectonics; Plutonic rocks; Pressure; Rifting; Sedimentary rocks; Spectra; Stratigraphic units; Temperature; Tethys; Trace elements; Triassic; Volcanic rocks; Whole rock; X-ray fluorescence spectra; Europe; Greece; Hellenic Arc; Hellenides; Peloponnesus Greece; Southern Europe; Angelona Greece; Pindos Ocean
Coordinates:N384300 N384500 E0230000 E0225600
Abstract Numbers:04M/1436
Record ID:2004053255
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute.
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