Glaucophane schists and associated rocks from Sifnos (Cyclades, Greece): New constraints on the P-T evolution from oxidized systems
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Groppo, Chiara; Forster, Margaret; Lister, Gordon; Compagnoni, Roberto
Description
The island of Sifnos (Cyclades, Greece) is famous for its spectacular blueschist-facies rocks and eclogites. Their very well preserved high-pressure assemblages are characterized by the occurrence of Fe+ 3-rich minerals such as aegirine-rich pyroxene, riebeckite-rich amphibole, magnetite and deerite. Therefore, the common model system NCFMASH (Na2O-CaO-FeO-MgO-Al2O3-SiO2 -H2O), in which all iron is assumed to be ferrous, is not sufficient to completely model these highly oxidized assemblages....[Show more]
dc.contributor.author | Groppo, Chiara | |
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dc.contributor.author | Forster, Margaret | |
dc.contributor.author | Lister, Gordon | |
dc.contributor.author | Compagnoni, Roberto | |
dc.date.accessioned | 2015-12-08T22:22:21Z | |
dc.identifier.issn | 0024-4937 | |
dc.identifier.uri | http://hdl.handle.net/1885/32534 | |
dc.description.abstract | The island of Sifnos (Cyclades, Greece) is famous for its spectacular blueschist-facies rocks and eclogites. Their very well preserved high-pressure assemblages are characterized by the occurrence of Fe+ 3-rich minerals such as aegirine-rich pyroxene, riebeckite-rich amphibole, magnetite and deerite. Therefore, the common model system NCFMASH (Na2O-CaO-FeO-MgO-Al2O3-SiO2 -H2O), in which all iron is assumed to be ferrous, is not sufficient to completely model these highly oxidized assemblages. We propose new constraints on the P-T evolution of the glaucophane schists and associated rocks from Vroulidia Bay (northern Sifnos) using P-T isochemical diagrams (pseudosections) modelled for the oxidized N(K)CFMASHO system [Na2O-(K2O)-CaO-FeO-Fe2O3-Mg O-Al2O3-SiO2-H2O], and calculated using solid solution models involving Fe+ 3-end-members. The resulting P-T conditions could be fitted by a simple trajectory consisting of a smooth clockwise P-T loop, with two distinct high-pressure events at T = 450-500 °C, P > 2.0 GPa (assemblage A) and T = 525-565 °C, P > 2.1 GPa (assemblage B), respectively, followed by cooling and decompression. Geospeedometry based on40Ar/39Ar data, however, allows constraint as to the duration of individual thermal excursions associated with these events. Should these limits be taken into account, the P-T envelope derived in this paper encompasses a more complex P-T history, with individual excursions that potentially involve relatively short periods of temperature increase ± pressure variation. | |
dc.publisher | Elsevier | |
dc.source | Lithos | |
dc.subject | Keywords: blueschist facies; cooling; glaucophane; oxidation; P-T conditions; source rock; tectonic evolution; ultrahigh pressure metamorphism; Cycladas; Eurasia; Europe; Greece; Sifnos; Southern Aegean; Southern Europe Blueschist- and eclogite-facies; Oxidized system; P-T path; Pseudosection; Sifnos | |
dc.title | Glaucophane schists and associated rocks from Sifnos (Cyclades, Greece): New constraints on the P-T evolution from oxidized systems | |
dc.type | Journal article | |
local.description.notes | Imported from ARIES | |
local.identifier.citationvolume | Online publication 2008 | |
dc.date.issued | 2008 | |
local.identifier.absfor | 040306 - Mineralogy and Crystallography | |
local.identifier.absfor | 040312 - Structural Geology | |
local.identifier.absfor | 040313 - Tectonics | |
local.identifier.ariespublication | u4047674xPUB93 | |
local.type.status | Published Version | |
local.contributor.affiliation | Groppo, Chiara, University di Torino | |
local.contributor.affiliation | Forster, Margaret, College of Physical and Mathematical Sciences, ANU | |
local.contributor.affiliation | Lister, Gordon, College of Physical and Mathematical Sciences, ANU | |
local.contributor.affiliation | Compagnoni, Roberto, University di Torino | |
local.description.embargo | 2037-12-31 | |
local.bibliographicCitation.startpage | CHEMGE | |
local.bibliographicCitation.lastpage | 15519 | |
local.identifier.doi | 10.1016/j.lithos.2008.10.005 | |
dc.date.updated | 2016-02-24T10:32:39Z | |
local.identifier.scopusID | 2-s2.0-63049092586 | |
local.identifier.thomsonID | 000265734000010 | |
Collections | ANU Research Publications |
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