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Jamshidzaei A, Torabi G, Ansari Kish R. Petrology and geochemistry of volcanic rocks from Kuh-e-Band-e-Siah (northwest of Anarak, Central Iran). www.ijcm.ir 2024; 32 (4) :725-738
URL: http://ijcm.ir/article-1-1891-en.html
URL: http://ijcm.ir/article-1-1891-en.html
1- Department of Geology, University of Isfahan, Isfahan, Iran
Abstract: (767 Views)
The Kuh-e-Band-e-Siah is located about 55 km northwest of Anarak and western part of the Central-East Iranian Microcontinent. In the studied area, the volcanic rocks of Eocene- Oligocene age with mafic to intermediate composition are exposed, and andesitic rocks are the predominant volcanic rocks. The most common textures of these rocks are porphyritic, glomeroporphyritic, trachytic, and microlitic porphyritic. The volcanic rocks of Kuh-e- Band-Siah are composed of primary minerals including clinopyroxene, plagioclase, amphibole, and quartz. Whole rock geochemical data reveal the calc-alkaline nature of volcanic rocks from Kuh-e- Band-Siah. The chondrite and primitive mantle normalized diagrams of the studied rocks show that these rocks have been enriched in LREE and LILE and have been depleted in HFSE. The negative anomalies of Ti, Nb, and Ta show that the studied samples are probably formed in a subduction zone and their similarity to volcanic rocks of continental arcs or convergent margins. The geochemical and tectonic setting studies of these rocks suggest that the parental magma has been derived from the partial melting of less than 15% of a metasomatized spinel lherzolite of lithospheric mantle.
Keywords: Petrology, volcanic rocks, Eocene-Oligocene, Kuh-e-Band-e-Siah, Anarak, Central-East Iranian Microcontinent
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