Dear Inal,
A best way to record slow or very slow cooling of metamorphic rocks is exhumation processes basically driven by erosion, in contrast to ehumation driven by tectonics, e.g. by extensional detachments, that most likely induce adiabatic-type segments of retrogressive paths (see for example Gapais et al., Terra Nova, Vol 21, No. 3, 188–194).
Hope this suggestion may help.
Cheers
Denis
Le 30 mai 2022 à 19:48, İnal Demirkaya <[log in to unmask]> a écrit :
Dear all,
I am a master student working on the metamorphic evolution of an amphibolite-facies metamorphic domain in northwest Turkey. The metamorphic area consists of mainly amphibolite and trondhjemitic felsic rocks which seem to be partial melting products of the amphibolites.
Geochronological data (U-Pb on zircon, U-Pb on rutile, U-Pb on titanate, K-Ar hornblende and Rb-Sr biotite) indicate metamorphic ages of 260 to 155 Ma. Based on the closure temperatures of the dated minerals, we infer that the metamorphism lasted was a long-lasted process from Middle Permian to Late Jurassic and the cooling from ca. 750-700 to ca. 250-300 °C occurred very slowly (3-5 °C/Ma).
I wonder whether there are metamorphic areas with similar slow cooling rates,
What geodynamic settings were proposed for the formation of such metamorphic areas with very slow cooling?
I would greatly appreciate any comment.
Thanks in advance
İnal Demirkaya
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Denis Gapais
Géosciences Rennes
UMR 6118 CNRS
Université de Rennes 1
35042 Rennes cedex
France
phone 33 2 23 23 67 36
mobile 33 6 20 01 58 69
fax 33 2 23 23 60 97
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