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Abstract
The study area, in east of Zanjan, with NW-SE trend exposed and structurally is located in Alborz-Azarbaijan zone and Tarom subzone. The mass composition is in monzogranite, quartz-monzonite, monzonite, quartz-monzodiorite and monzodiorite range. It belongs to high K calc-alkaline to Shoshsonitic magmatic series. According to the geochemistry and petrogenesis results, partial melting of magma has been the important controlling process of rock variety in the study area. All samples have negative anomalies of Nb that is related to subduction and active continental coastline zones as well as high anomalies of K, Rb and Ba explaining the role of continental crust or contamination with the continental crust. Granitic volcanic arc related environments and syenite alkali feldspar masses reflect the granite mass within the plate. Monzonites and diorites point to the volcanic arc and syenite and granite masses show within the plate environments.
Highlights
The study area (Zaker granite) is located in 16 km from NE of Zanjan and between 48 ̊29'E to 48 ̊53'E geographical longtitudes and 36 ̊33'E to 36 ̊45'E latitudes
Monzonites and diorites point to the volcanic arc and syenite and granite masses show within the plate environments
While in the fractional crystallization phenomenon (FC) changes of Zr value to the amount of Y have direct proportion and with increase of Zr, the value of Y increases (Figure 7). This diagram (Figure 7) for the samples of the study area shows the role of partial melting in the evolution of the area rocks
Summary
The study area (Zaker granite) is located in 16 km from NE of Zanjan and between 48 ̊29'E to 48 ̊53'E geographical longtitudes and 36 ̊33'E to 36 ̊45'E latitudes. Zaker granite is situated in the central part of the 1: 250,000 map of Zanjan (Figure 1) and the southern half of the 1:100,000 map of Tarom. In the geological zoning of Iran, the study area is a part of the Quaternary-tertiary magmatic belt of Western Alborz [1]. The belt has attracted the attention of many domestic and foreign researchers due to geological surveys and mineral studies [2].
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