Nature and physicochemical conditions of crystallization of biotite and plagioclase in the Zaghar intrusion(southwest of Tafarsh)

Document Type : Original Article

Authors
Saeed Naeimi 1
elham shahosinie 2
Mohammad Hashem Emami 3
1 arak university of technology
2 Imran, Tehran East Islamic Azad University
3 Associate Professor, Islamic Azad University, Research Sciences Unit, Tehran
10.22034/jes.2024.2028232.1046
Abstract
Zaghar intrusive mass is located 5 km west-southwest of Tafarsh city in Central province. This intrusive mass is accompanied by two series of felsic and medium dykes.The studied area is located in the central Iran zone and the structural division of Iran, this area is part of the Urmia Bazaman magmatic arc and under the Tabriz Saveh zone. The representative samples of the intrusive mass and dikes represent the composition of diorite, quartz-diorite, monzodiorite, and granodiorite with sub-alkaline and calc-alkaline tendencies and the geochemical characteristics of I-series granitoids and M-type mantle fractions. They are also placed in the tectonic position detection diagrams using the Y-Nb ratio in the range of volcanic arcs of the continental margin and at the same time as the collision. The Zaghar intrusive mass penetrated the Triassic limestones and Cretaceous limestones and transformed them into hornfels, marble, and skarn. Consequently, the Zaghar pluton is classified as the magnetite series granitoid. The Yousflo pluton is an I-type granite, that originated from a mixed mantle-crust source.
Keywords
granite
biotite
plagioclase
Zaghar intrusion
Iran