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
作者： J. Ghalamghash , S. Yajam , P. Montero , F. Bea , J. H. Scarrow
DOI: 10.1344/GEOLOGICAACTA2015.13.1.2
关键词:
摘要: The Ghorveh-Dehgolan plutons of the northern Sanandaj-Sirjan Zone, Zagros Orogen, comprise seven composite intrusive bodies that were generated during northeastward subduction Neotethys beneath Iranian sector Eurasian plate. Zircon U-Pb SHRIMP dating reveals magmatic activity spanned from ~160 to ~140Ma. It started with intrusion arc-related calc-alkaline mafic intermediate rocks closely followed by felsic I-type granitoids. This magmatism was post-dated alkaline A-type granites. In addition compositional changes over time, forming arc young towards southwest: north Ghorveh batholith (161±4Ma) and Shanevareh (160±2Ma); Qalaylan (159±3Ma); then central Ghorveh, Galali Saranjianeh (151±0.2Ma 148±1Ma); and, lastly, south (147±3Ma) Bolbanabad-Havarpan (144±1Ma). Whatever process driving changes, be it arc- or ridge-collision subducting system, slab roll-back, breakoff, initiation transference, etc., progression appears mark a significant change collisional an extensional setting in region Late Jurassic. Geochemical isotopic characteristics indicate Arabian-Nubian-like crust important component sources.
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