Document Type : Original Research Paper
Authors
1 Faculty of Earth Sciences, Shahid Beheshti University, Tehran, Iran
2 Ehsan Mining Group, Tehran, Iran
Abstract
The Zaghdareh area in the Esfandagheh-Faryab ophiolitic complex, southern Sanandaj-Sirjan belt, embraces extensive outcrops of mafic-intermediate lava flows and a felsic intrusive body. The volcanic rocks are calc-alkaline to tholeiitic, metaluminous, and distinguished by depletions in light rare earth elements and relatively flat patterns for heavy rare earth elements in chondrite-normalized diagram; the (La/Yb)N ratio is lower than unity for most samples. The chemical attributes for the Zaghdareh volcanic rocks are comparable to those developed in suprasubduction zones. The Zaghdareh intrusive body is distinguished by abundant plagioclase and quartz, and subordinate hornblende, phenocrysts in quartz-feldspar rich matrix. Representative samples from the intrusion plot in the trondhjemite-tonalite fields in the normative An-Ab-Or diagram. The intrusion is calc-alkaline to tholeiitic, peraluminous, and marked by enrichments in Na2O and CaO and depletions in K2O, Rb, and most other LILEs, as well as low K2O/ Na2O ratios, very low Rb/Sr ratio, and distinct depletions in light rare earth elements, which are typical of the oceanic plagiogranites. Results from this study and a comparison with other ophiolitic suites in Iran suggest that the occurrence of plagiogranites is a recurring feature associated with the development and evolution of ophiolitic suites in suprasubduction zones.
Keywords
Main Subjects
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Heidari, K., Nasrabadi, M., Nozaeem, R., and Gholizadeh, K., 2016. Mineralogy, geochemistry and petrogenesis of plagiogranitic intrusions from ophiolitic complex of southern Mehriz (SW Yazd). Journal title 2016; 2 (1) :13-32 URL:
http://gnf.khu.ac.ir/article-1-2548-fa.html. (in persian)
Huang, F., Xu, J., Chen, J., Kang, Z., and Dong, Y., 2015. Early Jurassic volcanic rocks from the Yeba formation and Sangri group: products of continental marginal arc and intraoceanic arc during the subduction of Neo- Tethys Ocean. Acta Petrol. Sin. 31, 2089–2100.
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