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Post-collisional magmatism and ore-forming systems in the Menderes massif: new constraints from the Miocene porphyry Mo–Cu Pınarbaşı system, Gediz–Kütahya, western Turkey

Delibaş, O.; Moritz, R.; Chiaradia, M.; Selby, D.; Ulianov, A.; Revan, M.K.

Post-collisional magmatism and ore-forming systems in the Menderes massif: new constraints from the Miocene porphyry Mo–Cu Pınarbaşı system, Gediz–Kütahya, western Turkey Thumbnail


Authors

O. Delibaş

R. Moritz

M. Chiaradia

A. Ulianov

M.K. Revan



Abstract

The Pınarbaşı Mo–Cu prospect is hosted within the Pınarbaşı intrusion, which is exposed together with the NW–SE-trending Koyunoba, Eğrigöz, and Baklan plutons along the northeastern border of the Menderes massif. The Pınarbaşı intrusion predominantly comprises monzonite, porphyritic granite, and monzodiorite. All units of the Pınarbaşı intrusion have sharp intrusive contacts with each other. The principal mineralization style at the Pınarbaşı prospect is a porphyry-type Mo–Cu mineralization hosted predominantly by monzonite and porphyritic granite. The porphyry type Mo–Cu mineralization consists mostly of stockwork and NE- and EW-striking sub-vertical quartz veins. Stockwork-type quartz veins hosted by the upper parts of the porphyritic granite within the monzonite, are typically enriched in chalcopyrite, molybdenite, pyrite, and limonite. The late NE- and EW-striking normal faults cut the stockwork vein system and control the quartz–molybdenite–chalcopyrite–sphalerite–fahlore–galena veins, as well as molybdenite–hematite-bearing silicified zones. Lithogeochemical and whole-rock radiogenic isotope data (Sr, Nd and Pb) of the host rocks, together with Re-Os molybdenite ages (18.3 ± 0.1 Ma – 18.2 ± 0.1 Ma) reveal that the monzonitic and granitic rocks of the Pınarbaşı intrusion were derived from an enriched lithospheric mantle-lower crust during Oligo–Miocene post-collisional magmatism. The lithospheric mantle was metasomatised by fluids and subducted sediments, and the mantle-derived melts interacted with lower crust at 35-40 km depth. This mechanism explains the Mo and Cu enrichments of the Pınarbaşı intrusion during back-arc magmatism. We conclude that the melt of the Pınarbaşı intrusion could have rapidly ascended to mid-crustal levels, with only limited crustal assimilation along major trans-lithospheric faults as a result of thinning of the middle to upper crust during regional extension, and resulted in the development of porphyry-style mineralization during the early Miocene (∼18 Ma). The subsequent exhumation history of the Mo–Cu-bearing Pınarbaşı intrusion is attributed to regional-scale uplift, and further exhumation along detachment faults of the associated core complexes during the middle to late Miocene.

Citation

Delibaş, O., Moritz, R., Chiaradia, M., Selby, D., Ulianov, A., & Revan, M. (2017). Post-collisional magmatism and ore-forming systems in the Menderes massif: new constraints from the Miocene porphyry Mo–Cu Pınarbaşı system, Gediz–Kütahya, western Turkey. Mineralium Deposita, 52(8), 1157-1178. https://doi.org/10.1007/s00126-016-0711-7

Journal Article Type Article
Acceptance Date Jan 12, 2017
Online Publication Date Jan 31, 2017
Publication Date 2017-12
Deposit Date Jan 16, 2017
Publicly Available Date Jan 31, 2018
Journal Mineralium Deposita
Print ISSN 0026-4598
Electronic ISSN 1432-1866
Publisher Springer
Peer Reviewed Peer Reviewed
Volume 52
Issue 8
Pages 1157-1178
DOI https://doi.org/10.1007/s00126-016-0711-7
Public URL https://durham-repository.worktribe.com/output/1367326

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