کانی شناسی و ژئوشیمی سنگهای برون بومی کربناتیتی – سیلیکاتی آتشفشانی ناحیه قخلار واقع در غرب مرند (استان آذربایجان شرقی)

In the west of Marand in Ghekhlar area, the Upper MiocenePleistocene volcanic rocks, including intermediate to acidic basic alkaline and lampr~phyric, are extensive exposed. Trachy-andesite rocks of this area contain carbonatite-silicate xenoliths, which according to mineralogical studies, are calcite - carbonatite type. The minerals of calcite, diopside, anorthite, phlogopite, amphibole, apatite, biotite and titano-magnetite are essential minerals, which belong to calcic and hydrous carbonatite types. The dacitic volcanic rocks of this area also contain carbonates globules that formed fr9m calcite and euhedral apatites. These xenoliths are geochemically characterized by high content ofCaO, Fe203, MgO, P20S, Cr, Ni, Y, Cu, Zn which are related to host rock. REE pattern displays fractionated pattern (CelYb)N = 24-29 and lack ofEu negative signature. The source of these xenoliths can be attributed to disequilibrium partial melting of metasomatized mantle by either released fluids from subducted slab or silicate melts derived from melting of subducted slab. Association of silicates and carbonates in xenoliths can be related to mingling and immiscible fluids.