Petrology of Eocene volcanic rocks in the NE of Lut block

Eocene volcanism in the Zouzan area, NE of Lut block, Eastern Iran, is presented by compositional range of different volcanic rocks include basalts, basaltic andesites, andesites and dacites. This magmatic assemblage exhibits high-K calc-alkaline affinities. The chemical variations of major and trace elements suggest key role for fractional crystallization of amphibole + clinopyroxene ± magnetite in the magmatic evolution of Zouzan volcanic rocks. All volcanic rocks display LILE and LREE enrichments and negative HFSE anomalies with high Ba/Nb, low Nb/Y and high Zr/Nb ratios indicative of arc and subduction related nature of their magmas. Geochemical data show that volcanic rocks have been formed from shallow level fractionation of an enriched mantle (most likely mixing of slab and OIB-like melts) during subduction of oceanic crust between Lut and Afghan blocks in Tertiary.

کلیدواژه ها:

Zouzan ، volcanic rocks ، Lut block ، fractional crystallization ، subduction