Paleozoic magmatism in the southwest of Julfa (northwestern Iran): Geochemical characteristics, U-Pb dating and tectonic setting

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DELAVARI MORTEZA; Arab Asadi Fatemeh; MOHAMMADI ALI

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Journal: PETROLOGY Year:2019 | Volume:10 | Issue:38 Page(s): 99-120

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Title

Paleozoic magmatism in the southwest of Julfa (northwestern Iran): Geochemical characteristics, U-Pb dating and tectonic setting

Author(s)

DELAVARI MORTEZA | Arab Asadi Fatemeh | MOHAMMADI ALI | Issue Writer Certificate

Keywords

basaltQ2

rhyoliteQ2

PaleozoicQ2

JulfaQ2

northwestern IranQ2

Abstract

Extensive sedimentary-igneous rock associations of Paleozoic age crop out in southwest of Julfa (northwest of Iran). Geochemically, the igneous rocks display various basic to acidic compositions. The basic rocks occur as several lava flows intercalated with Devonian siliciclastic units. Also, the acidic igneous rocks consist of rhyolitic lavas and associated pyroclastics (tuffs and ignimbrites). Based on zircon U-Pb dating, the acidic volcanics represent the age of 297± 4 Ma (Carboniferous-Permian boundary). The Devonian basic volcanics are chemically sodic alkaline and characterized by fractionated rare earth element (REE) patterns (LaN/YbN=5. 2-17). Furthermore, trace element chemistry of Devonian volcanics implies their formation in within-plate and non-subduction zone environment in accord with Devonian magmatism in other parts of Iran (Alborz and Central Iran). On the other hand, the major and trace element chemistry of acidic volcanics suggests their similarity to A (A2)-type granitoids. Therefore, the Permian acidic magmatism is probably related to an anorogenic (post-collisional) tectonic setting which in this case, the effects of the Hercynian orogeny in northwest of Iran could be assumed.

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APA: Copy

DELAVARI, MORTEZA, Arab Asadi, Fatemeh, & MOHAMMADI, ALI. (2019). Paleozoic magmatism in the southwest of Julfa (northwestern Iran): Geochemical characteristics, U-Pb dating and tectonic setting. PETROLOGY, 10(38 ), 99-120. SID. https://sid.ir/paper/408639/en

Vancouver: Copy

DELAVARI MORTEZA, Arab Asadi Fatemeh, MOHAMMADI ALI. Paleozoic magmatism in the southwest of Julfa (northwestern Iran): Geochemical characteristics, U-Pb dating and tectonic setting. PETROLOGY[Internet]. 2019;10(38 ):99-120. Available from: https://sid.ir/paper/408639/en

IEEE: Copy

MORTEZA DELAVARI, Fatemeh Arab Asadi, and ALI MOHAMMADI, “Paleozoic magmatism in the southwest of Julfa (northwestern Iran): Geochemical characteristics, U-Pb dating and tectonic setting,” PETROLOGY, vol. 10, no. 38 , pp. 99–120, 2019, [Online]. Available: https://sid.ir/paper/408639/en

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