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Majidi A, Ebrahimi M, Moayed M, Hajabolfath A. Geochemistry and tectonic setting of Aralan granitic intrusion (southwest of Marand), Central Iran zone. www.ijcm.ir 2023; 31 (4) :649-662
URL: http://ijcm.ir/article-1-1734-en.html
URL: http://ijcm.ir/article-1-1734-en.html
1- Department of Geology, Faculty of Sciences, University of Zanjan
2- Department of Earth Sciences, Faculty of Natural Sciences, University of Tabriz, Iran
2- Department of Earth Sciences, Faculty of Natural Sciences, University of Tabriz, Iran
Abstract: (903 Views)
The Aralan intrusion is located about 35 Km southwest of Marand in northwestern part of the Central Iran. This intrusion is composed of Codomain granitoid rocks that intruded into Precambrian Kahar Formation. The composition of the intrusion varies from Alkali feldspar granite to granite and mineralogically includes quartz, alkali feldspar, plagioclase, zircon and opaque minerals. These rocks display granular, perthitic, granophyric and myrmekitic textures. Evidences such as decreasing in grain size, cracking, fracturing, twin bending, kinking, recrystallization and myrmekitization indicate the role of shear zone in the study area, which has partly caused some deformation in the study rocks. This intrusion, based on textural evidence, is a hypabyssal intrusion and probably emplaced at low level crust. The study rocks have hypersolvus to transsolvus alkali feldspar textures, calc-alkaline to high K calc-alkaline affinity, high LILE+LREE and low HREE. Comparing with the standard spider diagram pattern for several tectonic setting, the Aralan intrusion is compatible with post-collision and within-plate tectonic setting. The study rocks belong to the A2-type subgroup of A-type granitoids. The Aralan intrusion is associated with tensional phase after finishing the compressional phase of Pan-African orogeny.
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