The Kaleybar intrusion with an area of 750 km² is located in the north east Azerbaijan, NW Iran. Based on structural subdivisions of Iran, it  is located in the West Alborz-Azerbaijan Zone wich is intruded into the Azerbaijan continental crust during Eocene to Oligocene following the Pyrenean Orogeny. It consists of various rock types including nepheline syenite, syenite, nepheline diorite together with minor diorite and microgranite. The rock forming minerals of the investigated nepheline syenites are plagioclase, orthoclase, nepheline, biotite and amphibole. Clinopyroxene, plagioclase, amphibole and nepheline are dominant minerals in nepheline diorite. Titanian garnet is uncommon accessory phase of the both rock types. Chemically, garnet from the nepheline syenite has TiO₂ contents ranging from 1 wt% to 5.0 wt%. Its composition is consistent with Ti-Adr_{67 to 78 mole %}Grs _{21 to 33 mole %}. Ti-garnet from the nepheline syenite is euhedral to subhedral with reddish to deep brown colours which is different from light brown anhedral and fine grain garnet from the nepheline diorite. Magmatic origin of the Ti-garnet from nepheline syenite is suggested on the basis of petrographic studies, mineralogical criteria and chemical properties whereas the secondary garnet in the nepheline diorite seems to originate from metasomatic source.

The Kaleybar alkaline igneous intrusion contains fine- to coarse-grained, anhedral to euhedral brown garnets. Most of the garnets are zoned. Generally, they occur in foid-bearing leucocratic rocks and the phenocrysts typically have analcime inclusions. According to mineral chemistry, the garnets of Kaleybar are Ti-andradites and melanites. The chemical zoning is characterized by a decrease in mole percent grossular, almandine, and spessartine and an increase in andradite from core to rim. On the basis of the present data, it can be concluded that the garnets in the Kaleybar intrusion are in the primary igneous phase that formed during the late magmatic stage and Ti-Si exchange in the tetrahedral site is the main substitution.

Mineral chemistry of micas from the subduction-related mafic and felsic alkaline rocks of the Kaleybar alkali-gabbro and the Bozqush nepheline syenite was determined. The micas generally occur as large poikilitic grains with Fe-Ti oxides and mafic minerals and give the rocks a spotted texture. Micas in the alkali-gabbro sometimes display a distinct lamination. Based on the International Mineralogical Association (IMA) classification scheme, the mica compositions plot between the siderophyllite and eastonite end members and show high Fe/(Fe + Mg) ratio (>0.33); therefore they are biotites. Chemical composition of the biotites varies from Mg-biotite in the Kaleybar alkali-gabbro through Fe-biotite in the Bozqush nepheline syenite. Based on their FeO, MnO, MgO, TiO₂, and Al^VI content, they are primary magmatic biotites. Despite the alkaline affinity of the biotite host rocks, they plot in the calc-alkaline orogenic suite field on FeO*, MgO, and Al₂O₃ geochemical diagrams.

The Bozqush, Kaleybar, and Razgah foid-bearing syenites are located in East Azarbaijan province, NW Iran. Mineral chemistry determined for the amphiboles and clinopyroxenes of intrusions to specify elemental exchange, magmatic affinity, and tectonic setting. Chemical composition of the amphiboles varies from magnasio-hastingsite to ferro-pargasite. This study shows that the Kaleybar amphiboles are richer in Ca+^IVAl than the Bozqush ones and Ca^IVAl=SiNa exchange is the main substitution. According to mineral chemistry, the clinopyroxenes are diopside. Considering the atomic proportion of Wo, En and Fs in the studied clinopyroxenes, variation in end-member components mostly involve the interchange of En and Fs. Moreover there is ^M2Ca^M1(Fe²⁺,Mg) = ^M2Na^M1Fe³⁺  exchange in the clinopyroxenes. The Composition of clinopyroxenes and amphiboles indicate that they were derived from volcanic arc miaskitic magma at relatively low pressures. Based on Al and Ti contents, thermobarometry of the amphiboles show pressures of 6±1 and 7±1 kbar for the Bozqush and Kaleybar intrusions respectively and temperature of 900±100 ˚C.