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Pressure–temperature evolution of blueschist facies rocks from Sifnos, Greece, and implications for the exhumation of high‐pressure rocks in the Central Aegean

Identifieur interne : 000180 ( Main/Exploration ); précédent : 000179; suivant : 000181

Pressure–temperature evolution of blueschist facies rocks from Sifnos, Greece, and implications for the exhumation of high‐pressure rocks in the Central Aegean

Auteurs : E. Schm Dicke [Allemagne] ; T. M. Will [Allemagne]

Source :

Journal of Metamorphic Geology [ 0263-4929 ] ; 2003-10.

RBID : ISTEX:E80EF9B8DD89848FA8D532E10AAC013163994199

Descripteurs français

Wicri :
- topic : Crète, Pétrologie.

English descriptors

Abstract

The blueschist and greenschist units on the island of Sifnos, Cyclades were affected by Eocene high‐pressure (HP) metamorphism. Using conventional geothermobarometry, the HP peak metamorphic stage was determined at 550–600 °C and 20 kbar, close to the blueschist and the eclogite facies transition. The retrograde P–T paths are inferred with phase diagrams. Pseudosections based on a quantitative petrogenetic grid in the model system Na2O–CaO–FeO–MgO–Al2O3–SiO2–H2O reveal coeval decompression and cooling for both the blueschist and the greenschist unit. The conditions of the metamorphic peak and those of the retrograde stages conform to a similar metamorphic gradient of 10–12 °C km−1 for both units. The retrograde overprint can be assigned to low‐pressure blueschist to HP greenschist facies conditions. This result cannot be reconciled with the (prograde) Barrovian‐type event, which affected parts of the Cyclades during the Oligocene to Miocene. Instead, the retrograde overprint is interpreted in terms of exhumation, directly after the HP stage, without a separate metamorphic event. Constraints on the exhumation mechanism are given by decompression‐cooling paths, which can be explained by exhumation in a fore‐arc setting during on‐going subduction and associated crustal shortening. Back‐arc extension is only responsible for the final stage of exhumation of the HP units.

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https://api.istex.fr/document/E80EF9B8DD89848FA8D532E10AAC013163994199/fulltext/pdf

DOI: 10.1046/j.1525-1314.2003.00482.x

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Le document en format XML

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<term>Avigad</term>
<term>Blackwell publishing</term>
<term>Blueschist</term>
<term>Blueschist unit</term>
<term>Blueschist units</term>
<term>Brocker</term>
<term>Bulk rock composition</term>
<term>Calcic</term>
<term>Calcic amphibole</term>
<term>Central aegean</term>
<term>Chlorite</term>
<term>Complex phase diagram</term>
<term>Conventional geothermobarometry</term>
<term>Conventional thermobarometry</term>
<term>Crete</term>
<term>Crustal</term>
<term>Crustal extension</term>
<term>Cyclades</term>
<term>Cycladic</term>
<term>Cycladic blueschist unit</term>
<term>Decompression</term>
<term>Eastern mediterranean</term>
<term>Eclogite</term>
<term>Eclogite facies rocks</term>
<term>Eclogites</term>
<term>Eocene</term>
<term>Epidote</term>
<term>Equilibration</term>
<term>European journal</term>
<term>Exhumation</term>
<term>Facies</term>
<term>Garnet</term>
<term>Geological society</term>
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<term>Greenschist facies metamorphism</term>
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<term>Greenschist units</term>
<term>Higher temperatures</term>
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<term>Isothermal decompression</term>
<term>Isothermal decompression path</term>
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<term>Lister</term>
<term>Long dimension</term>
<term>Metamorphic</term>
<term>Metamorphic event</term>
<term>Metamorphic geology</term>
<term>Metamorphic rocks</term>
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<term>Model system</term>
<term>Ncfmash</term>
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<term>Okrusch</term>
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<term>Peak assemblage</term>
<term>Petrology</term>
<term>Phase diagram</term>
<term>Phase diagrams</term>
<term>Phase relations</term>
<term>Phengite</term>
<term>Pseudosections</term>
<term>Quartz</term>
<term>Retrograde</term>
<term>Retrograde overprint</term>
<term>Ring layer</term>
<term>Schliestedt</term>
<term>Schliestedt matthews</term>
<term>Schliestedt okrusch</term>
<term>Sifnos</term>
<term>Sifnos samples</term>
<term>Sodic</term>
<term>Sodic amphibole</term>
<term>Stability range</term>
<term>Structural geology</term>
<term>Subduction</term>
<term>Tectonic</term>
<term>Tectonic contact</term>
<term>Thin section observations</term>
<term>Trivariant</term>
<term>Vroulidia</term>
<term>Western turkey</term>
<term>Wijbrans</term>
<term>Wijbrans mcdougall</term>
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<term>Assemblage</term>
<term>Avigad</term>
<term>Blackwell publishing</term>
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<term>Blueschist units</term>
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<term>Bulk rock composition</term>
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<term>Calcic amphibole</term>
<term>Central aegean</term>
<term>Chlorite</term>
<term>Complex phase diagram</term>
<term>Conventional geothermobarometry</term>
<term>Conventional thermobarometry</term>
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<term>Crustal extension</term>
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<term>European journal</term>
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<term>Garnet</term>
<term>Geological society</term>
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<term>Higher temperatures</term>
<term>Isothermal</term>
<term>Isothermal decompression</term>
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<term>Lister</term>
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<term>Metamorphic geology</term>
<term>Metamorphic rocks</term>
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<term>Model system</term>
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<term>Quartz</term>
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<term>Retrograde overprint</term>
<term>Ring layer</term>
<term>Schliestedt</term>
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<term>Schliestedt okrusch</term>
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<term>Sifnos samples</term>
<term>Sodic</term>
<term>Sodic amphibole</term>
<term>Stability range</term>
<term>Structural geology</term>
<term>Subduction</term>
<term>Tectonic</term>
<term>Tectonic contact</term>
<term>Thin section observations</term>
<term>Trivariant</term>
<term>Vroulidia</term>
<term>Western turkey</term>
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<term>Wijbrans mcdougall</term>
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<front><div type="abstract" xml:lang="en">The blueschist and greenschist units on the island of Sifnos, Cyclades were affected by Eocene high‐pressure (HP) metamorphism. Using conventional geothermobarometry, the HP peak metamorphic stage was determined at 550–600 °C and 20 kbar, close to the blueschist and the eclogite facies transition. The retrograde P–T paths are inferred with phase diagrams. Pseudosections based on a quantitative petrogenetic grid in the model system Na2O–CaO–FeO–MgO–Al2O3–SiO2–H2O reveal coeval decompression and cooling for both the blueschist and the greenschist unit. The conditions of the metamorphic peak and those of the retrograde stages conform to a similar metamorphic gradient of 10–12 °C km−1 for both units. The retrograde overprint can be assigned to low‐pressure blueschist to HP greenschist facies conditions. This result cannot be reconciled with the (prograde) Barrovian‐type event, which affected parts of the Cyclades during the Oligocene to Miocene. Instead, the retrograde overprint is interpreted in terms of exhumation, directly after the HP stage, without a separate metamorphic event. Constraints on the exhumation mechanism are given by decompression‐cooling paths, which can be explained by exhumation in a fore‐arc setting during on‐going subduction and associated crustal shortening. Back‐arc extension is only responsible for the final stage of exhumation of the HP units.</div>
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Pressure–temperature evolution of blueschist facies rocks from Sifnos, Greece, and implications for the exhumation of high‐pressure rocks in the Central Aegean

Pressure–temperature evolution of blueschist facies rocks from Sifnos, Greece, and implications for the exhumation of high‐pressure rocks in the Central Aegean

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

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Pour manipuler ce document sous Unix (Dilib)

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