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Mineral chemistry and thermobarometry of the staurolite-chloritoid schists from Poshtuk, NW Iran

Published online by Cambridge University Press:  17 May 2012

ADEL SAKI ,
MOHSSEN MOAZZEN  and
ROLAND OBERHÄNSLI
ADEL SAKI*
Affiliation:
Department of Geology, Shahid Chamran University of Ahvaz, Iran
MOHSSEN MOAZZEN
Affiliation:
Department of Geology, University of Tabriz, 51664, Tabriz, Iran
ROLAND OBERHÄNSLI
Affiliation:
Institute of Earth & Environmental Sciences, Potsdam University, Karl-Liebknecht-Strasse 24, 14476 Potsdam, Germany
*
†Author for correspondence: [email protected]
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Abstract

The Poshtuk metapelitic rocks in northwestern Iran underwent two main phases of regional and contact metamorphism. Microstructures, textural features and field relations indicate that these rocks underwent a polymetamorphic history. The dominant metamorphic assemblage of the metapelites is garnet, staurolite, chloritoid, chlorite, muscovite and quartz, which grew mainly syntectonically during the later contact metamorphic event. Peak metamorphic conditions of this event took place at 580 °C and ~3–4 kbar, indicating that this event occurred under high-temperature and low-pressure conditions (HT/LP metamorphism), which reflects the high heat flow in this part of the crust. This event is mainly controlled by advective heat input through magmatic intrusions into all levels of the crust. These extensive Eocene metamorphic and magmatic activities can be associated with the early Alpine Orogeny, which resulted in this area from the convergence between the Arabian and Eurasian plates, and the Cenozoic closure of the Tethys oceanic tract(s).

Keywords

thermobarometryHT/LP metamorphismPoshtuk metapelitesnorthwestern Iran
Type
Original Articles
Information
Geological Magazine , Volume 149 , Issue 6 , November 2012 , pp. 1077 - 1088
Copyright
Copyright © Cambridge University Press 2012

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