Skip to main content

Research Repository

Advanced Search

Multiple Porphyry Cu-Mo Events in the Eastern Pontides Metallogenic Belt, Turkey: From Early Cretaceous Subduction to Eocene Postcollision Evolution

Delibaş, Okan; Moritz, Robert; Selby, David; Göç, Deniz; Revan, Mustafa Kemal

Multiple Porphyry Cu-Mo Events in the Eastern Pontides Metallogenic Belt, Turkey: From Early Cretaceous Subduction to Eocene Postcollision Evolution Thumbnail


Authors

Okan Delibaş

Robert Moritz

Deniz Göç

Mustafa Kemal Revan



Abstract

Four porphyry Cu-Mo systems were investigated by Re-Os molybdenite geochronology to constrain their timing with respect to the geodynamic and magmatic evolution of the eastern Pontides, Turkey. Molybdenite from the Ispir-Ulutaş deposit yielded an Re-Os age of 131.0 ± 0.7 Ma, which is consistent with Early Cretaceous U-Pb laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) zircon ages of local calc-alkaline intrusions. It demonstrates that porphyry deposits were already formed during Early Cretaceous subduction of the Neotethys along the eastern Pontides, and that they can be correlated with porphyry Cu events in the adjacent Lesser Caucasus. Molybdenite Re-Os ages of 76.0 ± 0.4 and 75.7 ± 0.4 Ma at the Elbeyli prospect and 77.2 ± 1.0 Ma at the Emeksen prospect overlap with U-Pb LA-ICP-MS zircon ages of shoshonitic to high-K calc-alkaline intrusions in the region, which were emplaced during Late Cretaceous Neotethys subduction. A 50.7 ± 0.3 Ma molybdenite Re-Os age at the Güzelyayla deposit confirms porphyry Cu-Mo emplacement coeval with Eocene postcollisional, calc-alkaline adakitic magmatism of the eastern Pontides. An electron microprobe study of molybdenite samples, supplemented by data obtained during Re-Os dating, shows that the Eocene Güzelyayla deposit and the Late Cretaceous Emeksen prospect have the highest Re enrichment. Postcollisional melting of a thickened mafic lower continental crust and melting of a metasomatized lithospheric mantle with little to no interaction with upper crustal rocks may explain the Re enrichment at Güzelyayla and Emeksen, respectively.

Citation

Delibaş, O., Moritz, R., Selby, D., Göç, D., & Revan, M. K. (2019). Multiple Porphyry Cu-Mo Events in the Eastern Pontides Metallogenic Belt, Turkey: From Early Cretaceous Subduction to Eocene Postcollision Evolution. Economic geology and the bulletin of the Society of Economic Geologists, 114(7), 1285-1300. https://doi.org/10.5382/econgeo.4663

Journal Article Type Article
Acceptance Date Mar 1, 2019
Online Publication Date Jul 2, 2019
Publication Date Nov 1, 2019
Deposit Date Jul 8, 2019
Publicly Available Date Mar 29, 2024
Journal Economic Geology and the Bulletin of the Society of Economic Geologists
Print ISSN 0361-0128
Electronic ISSN 0361-0128
Publisher Society of Economic Geologists
Peer Reviewed Peer Reviewed
Volume 114
Issue 7
Pages 1285-1300
DOI https://doi.org/10.5382/econgeo.4663

Files





You might also like



Downloadable Citations