%0 Journal Article %T The Zayanderud metamorphic complex, North of Shahrekord: two entirely different interpretations of a basement complex in the Najafabad and Chadegan maps %J Scientific Quarterly Journal of Geosciences %I Geological Survey of Iran %Z 1023-7429 %A Jamali Ashtiani, R. %A Hassanzadeh, J. %A Rahgoshay, M. %D 2017 %\ 08/23/2017 %V 26 %N 104 %P 95-102 %! The Zayanderud metamorphic complex, North of Shahrekord: two entirely different interpretations of a basement complex in the Najafabad and Chadegan maps %K Zayanderud metamorphic complex %K Geological map of Najafabad %K Geological map of Chadegan %K Precambrian %K Jurassic %R 10.22071/gsj.2017.50174 %X Two different ages of Precambrian and Jurassic are considered for the Zayanderud metamorphic complex in the Najafabad and Chadegan geology maps, respectively. This disagreement has made these two maps to be the most incompatible adjacent maps. The metamorphic complex is nonconformably covered by fossiliferous Permian limestones suggesting a Pre-Permian age. This relative age is supported by 206Pb/238U zircon ages of Neoproterozoic for the cross-cutting mylonitic orthogneisses. In this paper we discuss the Jurassic age considered for protolith of the metamorphic and granitoid rocks in the Chadegan map as an misunderstanding in field observations. Also we argue that Ar/Ar Jurassic ages represent the time of metamorphism and do not reflect  the protolith age.     %U http://www.gsjournal.ir/article_50174_fe18e30642e91c52480414e76fb3bb35.pdf