The nature of transition from adakitic to non-adakitic magmatism in a slab window setting: A synthesis from the eastern Pontides, NE Turkey
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Eyuboglu-2013-The nature of transi.pdf
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Author(s)
Eyuboglu, Yener
Santosh, M.
Dudas, Francis O.
Akaryali, Enver
Chung, Sun-Lin
Akdag, Kemal
Bektas, Osman
Date Issued
November 2012
Journal
Geoscience Frontiers
Publisher
Elsevier
Citation
Eyuboglu, Yener, M. Santosh, Francis O. Dudas, Enver Akaryali, Sun-Lin Chung, Kemal Akdag, and Osman Bektaş. “The Nature of Transition from Adakitic to Non-Adakitic Magmatism in a Slab Window Setting: A Synthesis from the Eastern Pontides, NE Turkey.” Geoscience Frontiers 4, no. 4 (July 2013): 353–375. © 2012 China University of Geosciences (Beijing) and Peking University
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Final published version
Abstract
The eastern Pontides orogenic belt provides a window into continental arc magmatism in the Alpine–Himalayan belt. The late Mesozoic–Cenozoic geodynamic evolution of this belt remains controversial. Here we focus on the nature of the transition from the adakitic to non-adakitic magmatism in the Kale area of Gumushane region in NE Turkey where this transition is best preserved. The adakitic lithologies comprise porphyries and hyaloclastites. The porphyries are represented by biotite-rich andesites, hornblende-rich andesite and dacite. The hayaloclastites represent the final stage of adakitic activity and they were generated by eruption/intrusion of adakitic andesitic magma into soft carbonate mud. The non-adakitic lithologies include basaltic-andesitic volcanic and associated pyroclastic rocks. Both rock groups are cutting by basaltic dikes representing the final stage of the Cenozoic magmatism in the study area. We report zircon U-Pb ages of 48.71 ± 0.74 Ma for the adakitic rocks, and 44.68 ± 0.84 Ma for the non-adakitic type, suggesting that there is no significant time gap during the transition from adakitic to non-adakitic magmatism. We evaluate the origin, magma processes and tectonic setting of the magmatism in the southern part of the eastern Pontides orogenic belt. Our results have important bearing on the late Mesozoic–Cenozoic geodynamic evolution of the eastern Mediterranean region.
MIT Department
Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences
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DOI of Published Version
https://doi.org/10.1016/j.gsf.2012.10.001
