Scientific article
OA Policy
English

Mineral chemistry of ultramafic and mafic cumulates as an indicator of the arc-related origin of the Mersín ophiolite (southern Turkey)

Published inGeologische Rundschau, vol. 85, no. 4, p. 647-661
Publication date1996-12-01
First online date1996-12-01
Abstract

The Mersin ophiolite, represented by approximately 6-km-thick oceanic lithospheric section on the southern flank of the Taurus calcareous axis, formed in the Mesozoic Neo-Tethyan ocean some time during Late Cretaceous in southern Turkey. The ultramafic and mafic cumulates having over 3 km thickness consist of dunite ± chromite, wehrlite, clinopyroxenite at the bottom and pass into gabbroic cumulates in which leucogabbro, olivine-gabbro and anorthosite are seen. Crystallization order is olivine (Fo91−80) ± chromian spinel (Cr# 60-80), clinopyroxene (Mg#95−77), plagioclase (An95.6−91.6) and orthopyroxene (Mg#68−77). Mineral chemistry of ultramafic and mafic cumulates suggest that highly magnesian olivines, clinopyroxenes and absence of plagioclase in the basal ultramafic cumulates are in good agreement with products of high-pressure crystal fractionation of primary basaltic melts beneath an island-arc environment. Major, trace element geochemistry of the cumulative rocks also indicate that Mersin ophiolite was formed in an arc environment. Coexisting Ca-rich plagioclase and Forich olivine in the gabbroic cumulates show arc cumulate gabbro characteristics. Field relations as well as the geochemical data support that Mersin ophiolite formed in a supra-subduction zone tectonic setting in the southern branch of the Neo-Tethys in southern Turkey.

Keywords
  • Cumulate
  • Mineral chemistry
  • High-pressure fractionation
  • Suprasubduction
  • Mersin, Turkey
Funding
  • FNS - [2000-40240.94/1]
Citation (ISO format)
PARLAK, Osman, DELALOYE, Michel, BÍNGÖL, Ergüzer. Mineral chemistry of ultramafic and mafic cumulates as an indicator of the arc-related origin of the Mersín ophiolite (southern Turkey). In: Geologische Rundschau, 1996, vol. 85, n° 4, p. 647–661. doi: 10.1007/BF02440102
Main files (1)
Article (Published version)
Identifiers
Additional URL for this publicationhttp://link.springer.com/10.1007/BF02440102
Journal ISSN0016-7835
136views
210downloads

Technical informations

Creation23/12/2021 14:45:00
First validation23/12/2021 14:45:00
Update time16/03/2023 03:15:47
Status update16/03/2023 03:15:46
Last indexation01/11/2024 01:20:57
All rights reserved by Archive ouverte UNIGE and the University of GenevaunigeBlack