The spatial and compositional evolution of the Late Jurassic Ghorveh-Dehgolan plutons of the Zagros Orogen, Iran : SHRIMP zircon U-Pb and Sr and Nd isotope evidence
Yajam, S. (Kharazmi University (Teheran, Iran). Department of Geology)
Montero, P. (Universidad de Granada. Departamento de Mineralogía y Petrología)
Scarrow, J. H. (Universidad de Granada. Departamento de Mineralogía y Petrología)
Ghalamghash, J. (Geological Survey of Iran)
Razavi, S. M. H. (Kharazmi University (Teheran, Iran). Department of Geology)
Bea, Fernando (Universidad de Granada. Departamento de Mineralogía y Petrología)
Date: |
2015 |
Abstract: |
The Ghorveh-Dehgolan plutons of the northern Sanandaj-Sirjan Zone, Zagros Orogen, comprise seven composite intrusive bodies that were generated during northeastward subduction of Neotethys beneath the Iranian sector of the Eurasian plate. Zircon U-Pb SHRIMP dating reveals that the magmatic activity spanned from ~160 to ~140Ma. It started with intrusion of arc-related calc-alkaline mafic to intermediate rocks closely followed by felsic I-type granitoids. This magmatism was post-dated by felsic alkaline A-type granites. In addition to compositional changes over time, the plutons forming the arc young towards the southwest: the north Ghorveh batholith (161±4Ma) and Shanevareh (160±2Ma); Qalaylan (159±3Ma); then central Ghorveh, Galali and Saranjianeh (151±0. 2Ma to 148±1Ma); and, lastly, the south Ghorveh batholith (147±3Ma) and Bolbanabad-Havarpan (144±1Ma). Whatever the process driving the changes, be it arc- or ridge-collision with the subducting system, slab roll-back, slab breakoff, subduction initiation transference, etc. , the progression from I-type to A-type magmatism appears to mark a significant change from a collisional to an extensional setting in the region in the Late Jurassic. Geochemical and isotopic characteristics of the Ghorveh-Dehgolan plutons indicate that Arabian-Nubian-like crust was an important component of the magmatic sources. |
Rights: |
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Language: |
Anglès |
Document: |
Article ; recerca ; Versió publicada |
Subject: |
U-Pb SHRIMP dating ;
Sanandaj-Sirjan Zone ;
Neoproterozoic Arabian-Nubian crust ;
Neotethys ;
A-type granites |
Published in: |
Geologica acta, Vol. 13 Núm. 1 (March 2015) , p. 25-43, ISSN 1696-5728 |
Adreça alternativa: https://raco.cat/index.php/GeologicaActa/article/view/292730
Adreça alternativa: https://revistes.ub.edu/index.php/GEOACTA/article/view/GeologicaActa2015.13.1.2
DOI: 10.1344/GeologicaActa2015.13.1.2
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Record created 2015-05-13, last modified 2024-06-01