Shahid Beheshti University Researches in Earth Sciences 2008-8299 8 2 2017 05 22 Eocene magmatism of Orumieh- Dokhtar belt (North of Saveh): variation of volcanic suites in an extensional tectonic setting Eocene magmatism of Orumieh- Dokhtar belt (North of Saveh): variation of volcanic suites in an extensional tectonic setting 1 18 96252 FA Journal Article 2016 01 25 The studied volcanic association is located in the Orumieh- Dokhtar magmatic belt (North of Saveh) and includes andesite-basalt, trachyte- andesite and dacite. The rocks are predominantly Late Eocene in age. Geochemically, the rocks show calk-alkaline and less abundant alkaline signatures. The samples show LREE/HREE enrichment with (La/Yb)N, (Sm/Yb)N and (La/Sm)N ratios of 2.93- 10.27, 1.58- 2.16 and 1.79- 4.57, respectively. Based on Harker diagrams as well as geochemical modeling, magmatic differentiation process is not able to explain all the magmatic variations and supports the presence of distinct genetically unrelated rock suites. Although some of volcanic suites may be derived by fractional crystallization process from more mafic ones. Trace element geochemical modeling suggests that the dacites can be derived as The studied volcanic association is located in the Orumieh- Dokhtar magmatic belt (North of Saveh) and includes andesite-basalt, trachyte- andesite and dacite. The rocks are predominantly Late Eocene in age. Geochemically, the rocks show calk-alkaline and less abundant alkaline signatures. The samples show LREE/HREE enrichment with (La/Yb)N, (Sm/Yb)N and (La/Sm)N ratios of 2.93- 10.27, 1.58- 2.16 and 1.79- 4.57, respectively. Based on Harker diagrams as well as geochemical modeling, magmatic differentiation process is not able to explain all the magmatic variations and supports the presence of distinct genetically unrelated rock suites. Although some of volcanic suites may be derived by fractional crystallization process from more mafic ones. Trace element geochemical modeling suggests that the dacites can be derived as https://esrj.sbu.ac.ir/article_96252_3535e9914b88f317b5d366d48f5258e3.pdf