Cookies

We use cookies to ensure that we give you the best experience on our website. By continuing to browse this repository, you give consent for essential cookies to be used. You can read more about our Privacy and Cookie Policy.


Durham Research Online
You are in:

Foreland magmatism during the Arabia–Eurasia collision : Pliocene–Quaternary activity of the Karacadağ Volcanic Complex, SW Turkey.

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.

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.

Item Type:Article
Keywords:Arabia, Fissure volcano, Intraplate, Karacadağ, Turkey.
Full text:(AM) Accepted Manuscript
Download PDF
(1393Kb)
Status:Peer-reviewed
Publisher Web site:http://dx.doi.org/10.1093/petrology/egu040
Publisher 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.
Date accepted:20 June 2014
Date deposited:01 May 2015
Date of first online publication:18 August 2014
Date first made open access:No date available

Save or Share this output

Export:
Export
Look up in GoogleScholar