Abstract
According to petrographic and geochemical studies on the Chaleh Kaftar granitoids in Torud, these granitoids have an alkaline composition range including feldspar granite, quartz monzonite, and syenite. The dominant texture of the region is granular. Rock samples are of calc-alkaline nature and are situated along the calc-alkaline series. The rocks in the region are enriched with large ion lithophile elements (LILE) such as Rb, K and Th. Elements with a high ionic strength or high field strength elements (HFSE) such as Ti, P, Nb show depletion, which is the characteristic of volcanic arc granites. Such granites are formed as a result of the processes associated with subduction zones. By moving from the left to the right of spider diagrams a negative slope is observed. The zigzag pattern of these diagrams also reflects the crustal contamination of these granites. Light rare earth elements are found to be richer than heavy rare earth elements in the region. These granitoids belong to active continental margin arc environments.
Highlights
The study area is located in the northeast of Torud, 120 km of the south of Shahroud County, a suburb of Semnan Province
The rocks in the elements are enriched with large ion lithophile elements (LILE) such as Rb, K and Th
Elements with a high ionic strength or high field strength elements (HFSE) such as Ti, P, Nb show depletion, which is the characteristic of volcanic arc granites
Summary
The study area is located in the northeast of Torud, 120 km of the south of Shahroud County, a suburb of Semnan Province. This area is located in a region with latitude of 35 to 36°N and longitude of 54 to 55 °E. Research Method and Objectives: This objective was aimed to attain the following goals: 1) analysis of the petrography and the lithography of the region; 2) analyzing the geochemistry of the regional rocks and using them in the analysis of their formation; 3) determining the tectonomagmatic granitoid environment of the region. There, GCD Kite Igpet was used to interpret the geochemical information and determine the corresponding magma series
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