| Autor: |
Delibas O. Moritz R. Ulianov Chiaradia M. Saraç C. Revan K. & Göç D. |
| Rok vydání: |
2016 |
| Zdroj: |
Lithos |
| DOI: |
10.1016/j.lithos.2016.01.020 |
| Popis: |
This study focuses on the Elbeyli–Ordu Emeksen–Giresun Güzelyayla–Trabzon and Ulutas–Ispir porphyry typeprospects located in the Eastern Pontides Turkey. Our new LA ICP MS U–Pb zircon age data reveal that theElbeyli–Ordu Mo–Cu mineralization is hosted by a 77.0 ± 1.3 Ma old monzonite/monzodiorite with ashoshonitic character. The Emeksen Mo mineralization located 40 km southeast of the Elbeyli–Ordu prospectconsists of NW and NE striking quartz veins crosscutting a high K calc alkaline to shoshonitic granite dated at78.5±0.8Ma a granodiorite dated at 78.7±0.5Ma and porphyry granite dated at 77.7±0.5Ma. The Güzelyaylaporphyry Cu–Mo prospect consists of a stockwork type Cu–Mo mineralization crosscutting a calc alkaline 81.4 ± 1.1 Ma old dacite porphyry and Late Cretaceous calc alkaline andesite. The Ispir–Ulutas mineralizationis hosted within a highly sericitized 131.1 ± 0.9 Ma old quartz porphyry that intruded into a 132.9 ±0.6 Ma old calc alkaline granite porphyry. Our new U–Pb zircon ages lithogeochemical and radiogenic isotopicdata of the host rocks associated with the porphyry type prospects in the Eastern Pontides indicate that theyformed in an arc related environment during Cretaceous subduction of the Neotethys Ocean and the Ispir–Ulutas prospect is attributed to the main stage of the northward subduction of the Neotethys during the EarlyCretaceous. We conclude that the Güzelyayla and Emeksen hydrothermal systems were formed during a transitionalcompressional to extensional tectonic evolutionwhereas the Late Cretaceous Elbeyli hydrothermal systemwas emplaced during an extensional arc magmatic event. Highly oxidized high K calc alkaline to shoshoniticmagmas at Emeksen and Elbeyli were derived from a metasomatized heterogeneous and enriched lithosphericmantlewith variable degrees of partial melting of the mantle wedge and variable crustal contamination. Mixing/mingling processes between mafic magmas derived from the lower crust and acidic magmas at upper crustal levels played an important role in the formation of Cu–Moporphyry type mineralization in the Eastern Pontides. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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