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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. (Research Institute for Earth Sciences (Teheran, Iran). Geological Survey of Iran)
Razavi, S. M. H. (Kharazmi University (Teheran, Iran). Department of Geology)
Bea, F. (Universidad de Granada. Departamento de Mineralogía y Petrología)

Data: 2015
Resum: 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.
Drets: Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, sempre i quan aquestes es distribueixin sota la mateixa llicència que regula l'obra original i es reconegui l'autoria. Creative Commons
Llengua: Anglès
Document: article ; recerca ; publishedVersion
Matèria: U-Pb SHRIMP dating ; Sanandaj-Sirjan Zone ; Neoproterozoic Arabian-Nubian crust ; Neotethys ; A-type granites
Publicat a: Geologica acta, Vol. 13 Núm. 1 (March 2015) , p. 25-43, ISSN 1696-5728

Adreça alternativa:
DOI: 10.1344/GeologicaActa2015.13.1.2

25 p, 2.6 MB

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