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Foreland Magmatism during the Arabia–Eurasia Collision: Pliocene–Quaternary Activity of the Karacadağ Volcanic Complex, SW Turkey

Ekici, T.; Macpherson, C.G.; Otlu, N.; Fontignie, D.

Foreland Magmatism during the Arabia–Eurasia Collision: Pliocene–Quaternary Activity of the Karacadağ Volcanic Complex, SW Turkey Thumbnail


Authors

T. Ekici

N. Otlu

D. Fontignie



Abstract

Pliocene to Quaternary magmatism in the Karacadağ Volcanic Complex in SE Turkey occurred in the foreland region of the Arabia–Eurasia collision and can be divided into two phases. The earlier Karacadağ phase formed a north–south-trending volcanic ridge that erupted three groups of lavas. The same range of mantle sources contributed to the younger Ovabağ phase lavas, which were erupted from monogenetic cones to the east of the Karacadağ fissure. As at several other intraplate localities across the northern Arabian Plate this magmatism represents mixtures of melt from shallow, isotopically enriched mantle and from deeper, more depleted mantle. The deep source is similar to the depleted mantle invoked for other northern Arabian intraplate volcanic fields but at Karacadağ this source contained phlogopite. This source could be located in the shallow convecting mantle or may represent a metasomatic layer in the base of the lithosphere. There is no evidence for a contribution from the Afar mantle plume, as has been proposed elsewhere in northern Arabia. Melting during the Karacadağ and Ovabağ phases could have resulted from a combination of upwelling beneath weak or thinned lithosphere and restricted local extension of that weakened lithosphere as it collided with Eurasia. Tension associated with the collision focused magma of the Karacadağ phase into the elongate shield volcano of Mt. Karacadağ. The northern end of the fissure accommodated more extensive differentiation of magma, with isolated cases of crustal contamination, consistent with greater stress in the lithosphere closest to the collision. Most magma batches of the Karacadağ and Ovabağ phases differentiated by fractional crystallization at ∼5 MPa, near the boundary between the upper and lower crust. Magma batches dominated by melt from garnet lherzolite show evidence for restricted amounts of differentiation at ∼22·5 MPa, which is close to the base of the lithospheric mantle.

Citation

Ekici, T., Macpherson, C., Otlu, N., & Fontignie, D. (2014). Foreland Magmatism during the Arabia–Eurasia Collision: Pliocene–Quaternary Activity of the Karacadağ Volcanic Complex, SW Turkey. Journal of Petrology, 55(9), 1753-1777. https://doi.org/10.1093/petrology/egu040

Journal Article Type Article
Acceptance Date Jun 20, 2014
Online Publication Date Aug 18, 2014
Publication Date Sep 1, 2014
Deposit Date Apr 27, 2015
Publicly Available Date Mar 28, 2024
Journal Journal of Petrology
Print ISSN 0022-3530
Electronic ISSN 1460-2415
Publisher Oxford University Press
Peer Reviewed Peer Reviewed
Volume 55
Issue 9
Pages 1753-1777
DOI https://doi.org/10.1093/petrology/egu040
Keywords Arabia, Fissure volcano, Intraplate, Karacadağ, Turkey.

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Copyright Statement
This is a pre-copyedited, author-produced PDF of an article accepted for publication in Journal of petrology following peer review. The version of record Ekici, T. and Macpherson, C.G. and Otlu, N. and Fontignie, D. (2014) 'Foreland magmatism during the Arabia–Eurasia collision : Pliocene–Quaternary activity of the Karacadağ Volcanic Complex, SW Turkey.', Journal of petrology., 55 (9). pp. 1753-1777 is available online at: http://dx.doi.org/10.1093/petrology/egu040.





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