Date Thesis Awarded

5-2008

Document Type

Honors Thesis

Degree Name

Bachelors of Science (BS)

Department

Geology

Advisor

Brent Edward Owens

Committee Member

Tanya Furman

Committee Member

Christopher M. Bailey

Committee Member

Robert D. Pike

Abstract

Turkey has long been a tectonically active region. Given the strong links that exist between magmatism and tectonics, mafic volcanic products are useful probes into active and ancient tectonics. Abundant Turkish volcanism makes it a perfect natural laboratory in which to study tectonic processes such as subduction and delamination, which impact the chemical reservoirs in which they are active. In and around Sivas, Turkey the geochemical natures of post-Miocene mafic volcanics are explored with these ends in mind. Disparate incompatible trace element data are observed in the form of broad OIB signatures, arc-like Nb and Ta depletions, Tb/Yb ratios and relative depletions in K but not similarly incompatible element Th. Such ITE data are indicative of a mixed history of heterogeneous components, as well as a diverse melting history. Lavas from Sivas are linked with an original and similar mantle origin (Ba/Rb, Rb/Sr, and other ITE ratios), and various chemical heterogeneities are explored to understand both source and post-melting processes. These chemical variations can be linked to unique inputs caused by possible crustal interaction (Ce/Pb) or the addition of pelagic sediments to the source region (Th/La and Li). The possible role of delaminaiton or foundering is explored as a cause of apparent inconsistencies in ITE data. Further, a more robust theory of petrogenesis, involving heterogeneous source components and a more complex melting history, is proposed for the central Anatolian rock suites of Sivas, Turkey.

Creative Commons License

Creative Commons License
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 3.0 License.

Comments

Thesis is part of Honors ETD pilot project, 2008-2013. Migrated from Dspace in 2016.

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