Petrological characteristics of gabbroic intrusions in southeastern Urmia-Dokhtar magmatic belt, Kerman province, Iran: Evidence for post-Eocene mafic magmatism

At the south of Bardsir, Kerman province, Iran, southeastern part Urmia-Dokhtar magmatic arc (UDMA), a large number gabbroic intrusions are intruded into Eocene lava flows and pyroclastic rocks with form small stocks dykes. In this paper, geochemical variations, evolutions, origin these investigated. The studied characterized by fine-grained margins resulting from rapid cooling flow differentiation. They display porphyritic texture include coarse-grained clinopyroxene diopside compositions (Wo = 46.89, En 40.78, Fs 12.32), plagioclase labradorite composition (An 54.14), olivine in an intergranular crystalline groundmass. Their whole-rock chemistry proves that belong to calc-alkaline series. abundances trace elements REE, depletion Nb, Ta, Zr, Ti, Hf, enrichment LILE relative HFSE indicate subduction zone setting. Geochemical characteristics (Sm/Yb La/Sm ratios) show source rock was lithospheric mantle spinel lherzolite composition, which initially underwent partial melting (10% 20%) events then metasomatized fluids derived subducting Neo-Tethys lithosphere.