Petrogenetic evolution of an ophiolite fragment in an ensialic marginal basin, northern Aegean (Samothraki Island, Greece)

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doi: 10.1127/ejm/10/3/0551
Authors:Tsikouras, Basilios; Hatzipanagiotou, Konstantin
Author Affiliations:Primary:
University of Patras, Department of Geology, Patras, Greece
Volume Title:European Journal of Mineralogy
Source:European Journal of Mineralogy, 10(3), p.551-567. Publisher: Schweizerbart'sche Verlagsbuchhandlung (Nägele u. Obermiller), Stuttgart, Federal Republic of Germany. ISSN: 0935-1221
Publication Date:1998
Note:In English. 75 refs.; illus., incl. 4 tables, geol. sketch map
Summary:The ophiolitic rocks on Samothraki Island comprise gabbro, diorite (with associated plugs and veins), massive dolerite and basalt; doleritic dykes are rooted in the gabbro and acted as feeders for the basalt. The mineralogy and chemistry of the clinopyroxenes from the gabbro and basalt are taken to suggest that both crystallized under low P; minimum equilibrium T were ∼ 950°C for gabbro clinopyroxenes and 1050-1250°C for those of the basalt. Diorite hornblende-plagioclase pairs yielded equilibrium T of 690-740°C. The petrogenetic evolution of the ophiolite suite was controlled by plagioclase and clinopyroxene fractionation under increasing fO2; olivine was probably eliminated at an early stage. It is suggested that this ophiolite originated in an ensialic back-arc basin. [R.A.H.]
Subsections:Oceanic petrology
Subjects:Amphibole group; Basalts; Basins; Chain silicates; Chemical composition; Clinopyroxene; Diabase; Diorites; Gabbros; Igneous rocks; Mafic composition; Marginal basins; Metals; Mineral composition; Ophiolite; P-T conditions; Petrography; Plutonic rocks; Pyroxene group; Rare earths; Silicates; Volcanic rocks; Aegean Islands; Europe; Greece; Greek Aegean Islands; Mediterranean region; Southern Europe; Samothraki
Coordinates:N352000 N405000 E0283000 E0230000
Abstract Numbers:98M/4359
Record ID:1998046912
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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