Phase relations in the greenschist-blueschist-amphibolite-eclogite facies in the system Na2O-CaO-FeO-MgO-Al2O3-SiO2-H2O (NCFMASH), with application to metamorphic rocks from Samos, Greece

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doi: 10.1007/s004100050406
Authors:Will, Thomas; Okrusch, Martin; Schmädicke, Esther; Chen, Guoli
Author Affiliations:Primary:
Universität Würzburg, Mineralogisches Institut, Wurzburg, Federal Republic of Germany
Volume Title:Contributions to Mineralogy and Petrology
Source:Contributions to Mineralogy and Petrology, 132(1), p.85-102. Publisher: Springer International, Heidelberg-New York, International. ISSN: 0010-7999
Publication Date:1998
Note:In English. 52 refs.; illus., incl. 4 tables
Summary:Calculated phase equilibria are presented for sodic amphibole, calcic amphibole, garnet, chloritoid, talc, chlorite, paragonite, margarite, omphacite, plagioclase, carpholite, zoisite/clinozoisite, lawsonite, pyrophyllite, kyanite, sillimanite, quartz and H2O in the model system NCFMASH. The resultant petrogenetic grid provides a valuable tool for reconstructing the P-T evolution of metabasic rocks, as is demonstrated for rocks from the island of Samos. For rocks from N Samos, pseudomorphs after lawsonite preserved in garnet, the assemblage sodic amphibole-garnet-paragonite-chlorite-zoisite-quartz and the retrograde appearance of albitic plagioclase and the formation of calcic plagioclase around sodic amphibole, constrain a clockwise P-T path that reaches its thermal maximum at ∼ 520°C and 19 kbar. The derived P-T trajectory indicates cooling during exhumation of the rocks and is similar to paths for rocks from the W part of the Attic-Cycladic crystalline complex. Rocks from E Samos indicate lower P and are probably related to high-P rocks from the Menderes Massif, W Turkey. [R.A.H.]
Subsections:Metamorphism: regional, dynamic
Subjects:Amphibolite facies; Blueschist facies; Calcic composition; Eclogite facies; Facies; Genesis; Greenschist facies; Low pressure; Metamorphic rocks; Mineral assemblages; Models; P-T conditions; Phase equilibria; Pressure; Textures; Aegean Islands; Europe; Greece; Greek Aegean Islands; Mediterranean region; Samos; Southern Europe
Abstract Numbers:99M/1045
Record ID:1999057574
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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