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Whole-rock and mineral chemistry of cumulates from the Kızıldağ (Hatay) ophiolite (Turkey): clues for multiple magma generation during crustal accretion in the southern Neotethyan ocean

Published online by Cambridge University Press:  05 July 2018

U. Bağci ,
O. Parlak  and
V. Höck
U. Bağci
Affiliation:
Mersin Üniversitesi, Jeoloji Mühendisliği Bölümü, 33342 Çiftlikköy-Mersin, Turkey Çukurova Üniversitesi, Jeoloji Mühendisliği Bölümü, 01330 Balcalı-Adana, Turkey
O. Parlak*
Affiliation:
Çukurova Üniversitesi, Jeoloji Mühendisliği Bölümü, 01330 Balcalı-Adana, Turkey
V. Höck
Affiliation:
University of Salzburg, Department of Geology & Paleontology, A-5020 Salzburg, Austria
*
*E-mail: parlak@cukurova.edu.tr
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Abstract

The late Cretaceous Kızıldağ ophiolite forms one of the best exposures of oceanic lithospheric remnants of southern Neotethys to the north of the Arabian promontory in Turkey. The ultramafic to mafic cumulate rocks, displaying variable thickness (ranging from 165 to 700 m), are ductiley deformed, possibly in response to syn-magmatic extension during sea-floor spreading and characterized by wehrlite, olivine gabbro, olivine gabbronorite and gabbro. The gabbroic cumulates have an intrusive contact with the wehrlitic cumulates in some places. The crystallization order of the cumulus and intercumulus phases is olivine (Fo86–77)± chromian spinel, clinopyroxene (Mg#92–76), plagio-clase(An95–83), orthopyroxene(Mg#87–79). The olivine, clinopyroxene, orthopyroxene and plagioclase in ultramafic and mafic cumulate rocks seem to have similar compositional range. This suggests that these rocks cannot represent a simple crystal line of descent. Instead the overlapping ranges in mineral compositions in different rock types suggest multiple magma generation during crustal accretion for the Kızıldağ ophiolite. The presence of high Mg# of olivine, clinopyroxene, orthopyroxene, and the absence of Ca-rich plagioclase as an early fractionating phase co-precipitating with forsteritic olivine, suggest that the Kızıldağ plutonic suite is not likely to have originated in a mid-ocean ridge environment. Instead the whole-rock and mineral chemistry of the cumulates indicates their derivation from an island arc tholeiitic (IAT) magma. All the evidence indicates that the Kızıldağ ophiolite formed along a slow-spreading centre in a fore-arc region of a suprasubduction zone tectonic setting.

Keywords

suprasubductionforearcNeotethysTurkeycumulate
Type
Research Article
Information
Mineralogical Magazine , Volume 69 , Issue 1 , February 2005 , pp. 53 - 76
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2005

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