ESFAHANI ZAHRA NASR, MOHAMMAD HASHEM EMAMI, ZAKARIAEE SEYED JAMAL SHEIKH, SEYED HASSAN TABATABAEI
Volume 5 Issue 1 Pages 73-84 Publisher GEOCHEMISTRY
Description: The study area is located 110 kilometers East of Isfahan, Near the Jeshuqan village. This area is the part of Urumieh-Dokhtar belt in Central Iran. In this area there are a series of Eocene volcanic rocks. The composition of these rocks are andesite and dacite. Plagioclase amphibole, quartz are the main Phenocrysts in dasite rocks. Plagioclase amphibole, quartz are the main Phenocrysts in dasite rocks. The andesitic rocks consist of porphyritic textures with plagioclase and amphibole as the main mineral constituents with pyroxene for accessory mineral. Secondary minerals such as chlorite, calcite, epidote and iron oxide exist in both types of rocks. Sieve texture and selective alteration in plagioclase, opacitization of amphibole are very common in these rocks. Based on geochemical data, these rocks are calc-alkaline series. diagrams indicating tectonic environment represents a tectonic environment of continental volcanic arc. REE pattern and Pb positive anomalies also refers to cont-amination of the magma with continental crust.