Document Type
Thesis
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.
Date Awarded
2008
Department
Geology
Advisor 1
Brent E. Owens
Recommended Citation
Plummer, Charles L., "Searching for Tectonic Moments:Geochemical Tracers in Young Anatolian Basalts Sivas, Turkey" (2008). Geology Senior Theses. William & Mary. Paper 202.
https://scholarworks.wm.edu/geologyseniors/202
