Abstract
The study area is a quadrilateral of 155 km2 between eastern longitude 47˚ and 40 ′ to 47˚ and 52 ′ and northern latitudes 35˚ and 00 ′ to 35˚ and 04 ′ that is located in west of Iran, north of Sonqor city and between Varmaqan and Sardare Ghobadi villages of Kermanshah province. In this range, the intrusive rocks are alkaline granite, granite, granodiorite, tonalite, quartz alkaline syenite, quartz monzonite, quartz monzodiorite, quartz diorite, alkaline syenite, monzonite, diorite, gabbro diorite, gabbro, and olivine gabbro as they were injected in the iron ores of cretaceous which has resulted in contact metamorphism and created hornfels at the site of contact. After comprehensive sampling of all required igneous rocks and according to the thesis objectives, thin sections were prepared and after petrography and some samples were selected for geochemical experiments. XRF analysis, ICP and alkaline fusion were performed on some samples. According to geochemical and petrological studies, the magmas forming these intrusive igneous rocks are from one region and because of magmatic differentiation or fractional crystallization, they from basaltic to acidic terms. Samples of this quadrilateral have a meta-alumina nature and granitoids are in the range of arc islands granites, continental arc granitoids and continental collision granitoids. The mineralogical and chemical composition of the acidic rocks in the area show that the granites in this study are type I.
Highlights
The study area is a quadrilateral of 155 km2 between eastern longitude 47 ̊ and 40 ′ to 47 ̊ and 52 ′ and northern latitudes 35 ̊ and 00 ′ to 35 ̊ and 04 ′ that is located in west of Iran, north of Sonqor city and between Varmaqan and Sardare Ghobadi villages of Kermanshah province
Due to its geological conditions, this quadrilateral is in a fragmented area and in terms of Iran’s geological divisions, it is located in the Sanandaj – Sirjan zone which its oldest formation is the Jurassic and the youngest is the young Quaternary alluvium
According to field of study conclusions, the following results were obtained: Plutonic masses were studied in the north of Sonqor in Kermanshah province and between Varmaqan in the east of the study area and Sardare Ghobadi to the west of the study area
Summary
Kermanshah province in located in the west of Iran, with an area of 24640 square kilometers and located between eastern longitude 45 ̊and 20 ° and 39′′ to 48 ° and 01′ and 58′′ and northern latitude 33 ̊ and 37′ and 08′′ to 35 ̊ and 17′ and 08′′. Kermanshah province is a mountainous area that lies between the Iranian plateau and the Mesopotamian Plateau and is covered by the Zagros Mountain Peak and Highlands. The studied intrusions were injected into the Sanandaj-Sirjan metamorphic belt. Their injections are from the Cretaceous to the late Eocene and early Oligocene (Tarabi et al 2019, Yazdi et al 2019, Jamshidibadr et al 2020). The study area is amongst the formations of the young Zagros mountain range that extends from northwest to southeast of Iran. Due to its geological conditions, this quadrilateral is in a fragmented area and in terms of Iran’s geological divisions, it is located in the Sanandaj – Sirjan zone which its oldest formation is the Jurassic and the youngest is the young Quaternary alluvium
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