Zircon U-Pb Ages and Magmatic History of the Kashan Plutons in the Central Urumieh-Dokhtar Magmatic Arc, Iran: Evidence for Neotethyan Subduction during Paleogene-Neogene

The Kashan plutons are situated in the central part of Urumieh-Dokhtar magmatic arc recording subduction-related magmatism within the Alpine-Himalayan orogeny in Iran. These rocks consist of different calc-alkaline plutonic rocks including gabbro, gabbroic diorite, microdiorite, monzodiorite, tonali...

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Published in:Journal of earth science (Wuhan, China) China), 2020-02, Vol.31 (1), p.53-68
Main Authors: Khaksar, Tayebeh, Rashidnejad-Omran, Nematollah, Chen, Fukun, Song, Shu-Guang, Li, Shuang-Qing, Ghaderi, Majid
Format: Article
Language:English
Subjects:
Biogeosciences
Diorite
Earth and Environmental Science
Earth Sciences
Eocene
Gabbro
Geochemistry
Geochronometry
Geological time
Geology
Geotechnical Engineering & Applied Earth Sciences
Igneous rocks
Jurassic
Lead
Magma
Miocene
Neogene
Orogeny
Paleogene
Petrology and Geochronology
Plutons
Radiometric dating
Rock
Rocks
Subduction
Zircon
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Summary:The Kashan plutons are situated in the central part of Urumieh-Dokhtar magmatic arc recording subduction-related magmatism within the Alpine-Himalayan orogeny in Iran. These rocks consist of different calc-alkaline plutonic rocks including gabbro, gabbroic diorite, microdiorite, monzodiorite, tonalite, granodiorite, and granite. The plutons were emplaced into the Jurassic sedimentary units (Shemshak Formation) and the Eocene calc-alkaline volcanic and pyroclastic rocks. New U-Pb zircon ages show that the Kashan plutons formed during two main periods at 35.20±0.71 Ma in the Late Eocene (Priabonian) and at 18.90±0.84, 19.26±0.83, 19.30±1.2, and 17.3±1.8 Ma in the Early Miocene (Burdigalian). The reported events in the Kashan plutons imply the final phases of subductionrelated magmatism before the collision which happened between the Arabian and Iranian plates in the Middle Miocene. The plutonic activity in the Kashan region occurred during the transition from Eocene subduction-related setting to Middle Miocene collisional setting.
ISSN:1674-487X
1867-111X
DOI:10.1007/s12583-020-1258-1