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Petrogenesis and tectonic evolution of metaluminous sub-alkaline granitoids from the Takab Complex, NW Iran

Published online by Cambridge University Press:  01 September 2010

ROBAB HAJIALIOGHLI ,
MOHSSEN MOAZZEN ,
AHMAD JAHANGIRI ,
ROLAND OBERHÄNSLI ,
BEATE MOCEK  and
UWE ALTENBERGER
ROBAB HAJIALIOGHLI*
Affiliation:
Department of Geology, University of Tabriz, 51664, Tabriz, Iran
MOHSSEN MOAZZEN
Affiliation:
Department of Geology, University of Tabriz, 51664, Tabriz, Iran
AHMAD JAHANGIRI
Affiliation:
Department of Geology, University of Tabriz, 51664, Tabriz, Iran
ROLAND OBERHÄNSLI
Affiliation:
Institut für Geowissenschaften, Universität Potsdam, Germany
BEATE MOCEK
Affiliation:
Department of Geology, University of Kansas, Lawrence, Kansas, USA
UWE ALTENBERGER
Affiliation:
Institut für Geowissenschaften, Universität Potsdam, Germany
*
§Author for correspondence: hajialioghli@tabrizu.ac.ir
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Abstract

The Takab complex is composed of a variety of metamorphic rocks including amphibolites, metapelites, mafic granulites, migmatites and meta-ultramafics, which are intruded by the granitoid. The granitoid magmatic activity occurred in relation to the subduction of the Neo-Tethys oceanic crust beneath the Iranian crust during Tertiary times. The granitoids are mainly granodiorite, quartz monzodiorite, monzonite and quartz diorite. Chemically, the magmatic rocks are characterized by ASI<1.04, AI<0.87 and high contents of CaO (up to ~14.5 wt%), which are consistent with the I-type magmatic series. Low FeOt/(FeOt+MgO) values (<0.75) as well as low Nb, Y and K2O contents of the investigated rocks resemble the calc-alkaline series. Low SiO2, K2O/Na2O and Al2O3 accompanied by high CaO and FeO contents indicate melting of metabasites as an appropriate source for the intrusions. Negative Ti and Nb anomalies verify a metaluminous crustal origin for the protoliths of the investigated igneous rocks. These are comparable with compositions of the associated mafic migmatites, in the Takab metamorphic complex, which originated from the partial melting of amphibolites. Therefore, crustal melting and a collision-related origin for the Takab calc-alkaline intrusions are proposed here on the basis of mineralogy and geochemical characteristics. The P–T evolution during magmatic crystallization and subsolidus cooling stages is determined by the study of mineral chemistry of the granodiorite and the quartz diorite. Magmatic crystallization pressure and temperature for the quartz-diorite and the granodiorite are estimated to be P~7.8±2.5 kbar, T~760±75°C and P~5±1 kbar, T~700°C, respectively. Subsolidus conditions are consistent with temperatures of ~620°C and ~600°C, and pressures of ~5 kbar and ~3.5 kbar for the quartz-diorite and the granodiorite, respectively.

Keywords

granitoidspartial meltingNeo-TethysTakabNW Iran
Type
Original Article
Information
Geological Magazine , Volume 148 , Issue 2 , March 2011 , pp. 250 - 268
Copyright
Copyright © Cambridge University Press 2010

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Footnotes

Deceased

In Memory of Doctor Beate Mocek (1962–2010)

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