TY - JOUR
T1 - Cooling during the exhumation of a blueschist terrane
T2 - Sifnos (Cyclades), Greece
AU - Avigad, D.
AU - Matthews, A.
AU - Evans, B. W.
AU - Garfunkel, Z.
PY - 1992
Y1 - 1992
N2 - Alpine high-pressure metamorphic rocks exposed in the Cyclades were overprinted during their exhumation. The metamorphic evolution of a pervasively overprinted rock sequence, the Greenschist unit, exposed in the island of Sitnos was studied. The metamorphic evolution in the Greenschist unit is characterized by the progressive transformation of eclogite-facies rocks through albite-bearing epidote blueschists into greenschists. A P-T path for the greenschist unit is presented indicating eclogite-facies conditions of around 480-520°C and 12-15 kbar, followed by overprinting in the albite-bearing epidote-blueschist facies at P-T conditions of 8-10 kbar and ca.480-500°C. The high-pressure metamorphic rocks of Sifnos appears 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 during decompression are found in the east. -from Authors
AB - Alpine high-pressure metamorphic rocks exposed in the Cyclades were overprinted during their exhumation. The metamorphic evolution of a pervasively overprinted rock sequence, the Greenschist unit, exposed in the island of Sitnos was studied. The metamorphic evolution in the Greenschist unit is characterized by the progressive transformation of eclogite-facies rocks through albite-bearing epidote blueschists into greenschists. A P-T path for the greenschist unit is presented indicating eclogite-facies conditions of around 480-520°C and 12-15 kbar, followed by overprinting in the albite-bearing epidote-blueschist facies at P-T conditions of 8-10 kbar and ca.480-500°C. The high-pressure metamorphic rocks of Sifnos appears 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 during decompression are found in the east. -from Authors
UR - http://www.scopus.com/inward/record.url?scp=0026464863&partnerID=8YFLogxK
U2 - 10.1127/ejm/4/3/0619
DO - 10.1127/ejm/4/3/0619
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AN - SCOPUS:0026464863
SN - 0935-1221
VL - 4
SP - 619
EP - 634
JO - European Journal of Mineralogy
JF - European Journal of Mineralogy
IS - 3
ER -