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Cooling during the exhumation of a blueschist terrane; Sifnos (Cyclades), Greece

Dov Avigad, Alan Matthews, Bernard W. Evans and Zvi Garfunkel
Cooling during the exhumation of a blueschist terrane; Sifnos (Cyclades), Greece
European Journal of Mineralogy (June 1992) 4 (3): 619-634


Alpine high-P metamorphic rocks in the Cyclades were overprinted during their exhumation. The evolution of the Greenschist unit of Sifnos is characterized by the progressive transformation of eclogite-facies rocks through albite-epidote blueschists into greenschists.On the basis of mineral analyses and Fe/Mg exchange thermometry, this evolution is referred to specific P-T fields in the petrogenic grid proposed by Evans. A P-T path for the unit indicates eclogite-facies conditions of 12-15 kbar and 480-520 degrees C, followed by overprinting in the albite- epidote blueschist at 8-10 kbar and approx 480-500 degrees C; subsequent overprint to the greenschist facies is estimated at 5.5 kbar and approx 450 degrees C. The decompression part of the P-T path is characterized by cooling. Thus these high-P Sifnos rocks appear not to follow the thermal evolution path predicted by models which assume whole crust uplift and erosion. On a regional scale the exhumation of the Cycladic blueschist belt is characterized by cooling in the west, but broad clockwise P-T loops with significant heating decompression are found in the east.

ISSN: 0935-1221
Serial Title: European Journal of Mineralogy
Serial Volume: 4
Serial Issue: 3
Title: Cooling during the exhumation of a blueschist terrane; Sifnos (Cyclades), Greece
Affiliation: Hebrew University of Jerusalem, Department of Geology, Jerusalem, Israel
Pages: 619-634
Published: 199206
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 56
Accession Number: 1995-056321
Categories: Igneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table, geol. sketch maps
N36°45'00" - N37°15'00", E24°30'00" - E25°00'00"
Secondary Affiliation: University of Washington, USA, United States
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 199520
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