Volume 10, Issue 1 (Spring & Summer 2024)
KJES 2024, 10(1): 278-306 |
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Najari M, Jahangiri A, Anma R. U-Pb dating and geodynamics of mafic bodies at the southern margin of Lake Urmia, an evidence of Cretaceous magmatism in northwest Iran. KJES 2024; 10 (1) :278-306
URL: http://gnf.khu.ac.ir/article-1-2905-en.html
URL: http://gnf.khu.ac.ir/article-1-2905-en.html
1- University of Tabriz, Tabriz , Najary2006@gmail.com
2- University of Tabriz, Tabriz
3- Tokushima University
2- University of Tabriz, Tabriz
3- Tokushima University
Abstract: (119 Views)
In the northwestern part of the Sanandaj-Sirjan zone, mafic intrusive bodies are aligned with the trend of the Zagros orogenic belt. In this part of the Iranian lithosphere, magmatic activity occurred during three main periods: Cretaceous, Eocene, and Miocene-Quaternary. In the first of two stages, the magmatic activity was associated with subduction-related magmatism at the active continental margin, whereas the last phase was characterized by calc-alkaline magmatism related to post-collision regime. The intrusive mafic bodies of Qobadlo, Chupankareh, and Qaraqoshun at the southern margin of Lake Urmia in the northern part of the Sanandaj-Sirjan zone intruded within the complex of Cretaceous shale, shale-sandstone, and siltstone. U-Pb dating on zircon performed on these bodies indicates an age of 99 Ma. The SiO2 content of these bodies ranges from 46.17 to 53.35%, Al2O3 13.1 to 18.49 % Fe2O3 3.11 to 5.8%, and their TiO2 content ranges from 1.9 to 4.0%. Positive anomalies of large ion lithophile elements and LREE compared with negative anomalies of elements such as Nb, P, Zr, and Ta (HFSE), the La/Nb, Ba/Nb ratios, and the REE pattern show a good correlation with the magmatic rocks of subduction zones.
Type of Study: Original Research |
Subject:
Petrology
Received: 2024/07/8 | Accepted: 2024/09/10 | Published: 2024/09/21
Received: 2024/07/8 | Accepted: 2024/09/10 | Published: 2024/09/21
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