Type of Document Master's Thesis Author Davarpanah, Armita Author's Email Address adavarpanah1@student.gsu.edu URN etd-07132009-152627 Title MAGMATIC EVOLUTION OF THE EOCENE VOLCANIC ROCKS OF THE BIJGERD KUH E KHARCHIN AREA, UROMIEH-DOKHTAR ZONE, IRAN Degree Master of Science Department Geoscience Advisory Committee
Advisor Name Title Hassan A. Babaie Committee Chair Eirik J. Krogstad Committee Member Morteza Khalatbari- Jafari Committee Member Timothy E. La Tour Committee Member Keywords
- Saveh
- Iran
- Uromieh-Dokhtar volcanic- plutonic zone
- Eocene volcanism
- Partial melting
- Fractional crystallization
- Magma mixing/mingling
- Bijgerd-Kuh e Kharchin area
Date of Defense 2009-04-06 Availability unrestricted Abstract Composition and texture of the Middle and Late Eocene volcanic, volcaniclastic, and volcanic-sedimentary rocks in the Bijgerd-Kuh e Kharchin area, in the Uromieh-Dokhtar zone northwest of Saveh, Iran, suggest the complexity of the magmatic system that involved multiple eruptions from one or more sources. Hydrated volcanic fragments in hyaloclastic rocks, and the presence of a sequence of shallow and intermediate-depth marine microfossils, suggest that the Middle Eocene units were erupted in a marine basin. The bimodal volcanism of the Late Eocene is distinguished by the presence of four alternating sequences of hyaloclastite lava and ignimbrite. The REE patterns show spatial homogeneity and temporal heterogeneity in the composition of all the Late Eocene sequences, suggesting origination of magma from varying sources that erupted at different times. The trace element distributions of the hyaloclastites and ignimbrites are compatible with those evolved through fractional crystallization of the lower and upper continental crust, respectively.Files
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