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Geochemical constraints on Eocene ignimbrite flare-up in the Urumieh-Dokhtar magmatic arc, northwestern Iran

文献类型：期刊论文

作者Fazlnia, Abdolnaser4; Pang, Kwan-Nang3; Ji, Wei-Qiang1; Pirouei, Mohammad2
刊名LITHOS
出版日期2023-08-01
卷号450页码:13
ISSN号0024-4937
关键词Dacite Rhyolite Ignimbrite Flare-up Urumieh-Dokhtar magmatic arc
DOI10.1016/j.lithos.2023.107189
英文摘要Middle Eocene was the climax of a magmatic flare-up event in the Urumieh-Dokhtar magmatic arc, Iran, yet its potential trigger and mechanism of magma generation remain poorly understood. To explore such issues, we analyze a set of silicic ignimbrites at Arbat in the northwestern part of the arc for zircon U-Pb age, whole-rock major and trace elements, and Sr-Nd isotopes. The studied rocks display pyroclastic textures with sanidine, plagioclase, amphibole, Fe-Ti oxides and rhyolitic glass as dominant phases. An eruption age of-44 Ma was indicated by zircon U-Pb age data for representative samples. The rocks are characterized by dacitic to rhyolitic compositions and restricted ranges in most major elements (e.g.,-66-70 wt% SiO2,-13.1-14.1 wt% Al2O3,-3.5-3.9 wt% K2O). While most rocks have coherent trace element patterns as average continental crust, trace element concentrations show two-to three-fold variations that are correlated to SiO2 contents. The rocks have a range of age-corrected Sr and Nd isotopic compositions (initial 87Sr/86Sr = 0.7053 to 0.7067, epsilon Nd =-0.8 to-4.1) that are also correlated to SiO2 contents, resembling trends of assimilation and fractional crystallization (AFC). However, AFC cannot explain the trace element variations, which are otherwise consistent with mixing. We propose that the most silica-rich rhyolitic rocks represent dominantly crustal melts of the Iranian basement, and less silica-rich dacitic rocks represent mixed products between those melts and a mafic component of depleted mantle-like Sr-Nd isotopic compositions. The involvement of crustal melts is required to account for the geochemical variability seen in igneous rocks formed during the Iranian arc flare-up, and might be applicable to other magmatic flare-ups worldwide.
WOS关键词ARABIA-EURASIA COLLISION ; TRACE-ELEMENT ; PB GEOCHRONOLOGY ; ISOTOPIC CONSTRAINTS ; ZONE MAGMATISM ; SILICIC MAGMAS ; EVOLUTION ; ZIRCON ; SUBDUCTION ; ORIGIN
资助项目Urmia University, Iran, National Science and Technology Council[111-2116-M-001-031] ; Career Development Award, Academia Sinica, Taiwan[AS-CDA-109-M07]
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
出版者ELSEVIER
WOS记录号WOS:000990810000001
资助机构Urmia University, Iran, National Science and Technology Council ; Urmia University, Iran, National Science and Technology Council ; Career Development Award, Academia Sinica, Taiwan ; Career Development Award, Academia Sinica, Taiwan ; Urmia University, Iran, National Science and Technology Council ; Urmia University, Iran, National Science and Technology Council ; Career Development Award, Academia Sinica, Taiwan ; Career Development Award, Academia Sinica, Taiwan ; Urmia University, Iran, National Science and Technology Council ; Urmia University, Iran, National Science and Technology Council ; Career Development Award, Academia Sinica, Taiwan ; Career Development Award, Academia Sinica, Taiwan ; Urmia University, Iran, National Science and Technology Council ; Urmia University, Iran, National Science and Technology Council ; Career Development Award, Academia Sinica, Taiwan ; Career Development Award, Academia Sinica, Taiwan
源URL[http://ir.iggcas.ac.cn/handle/132A11/110913]  
专题地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者Fazlnia, Abdolnaser; Pang, Kwan-Nang
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing, Peoples R China
2.Soran Univ, Fac Sci, Dept Petr Geosci, POB 624, Soran, Iraq
3.Acad Sin, Inst Earth Sci, Taipei, Taiwan
4.Urmia Univ, Dept Geol, Orumiyeh 57153165, Iran
推荐引用方式
GB/T 7714		 Fazlnia, Abdolnaser,Pang, Kwan-Nang,Ji, Wei-Qiang,et al. Geochemical constraints on Eocene ignimbrite flare-up in the Urumieh-Dokhtar magmatic arc, northwestern Iran[J]. LITHOS,2023,450:13.
APA Fazlnia, Abdolnaser,Pang, Kwan-Nang,Ji, Wei-Qiang,&Pirouei, Mohammad.(2023).Geochemical constraints on Eocene ignimbrite flare-up in the Urumieh-Dokhtar magmatic arc, northwestern Iran.LITHOS,450,13.
MLA Fazlnia, Abdolnaser,et al."Geochemical constraints on Eocene ignimbrite flare-up in the Urumieh-Dokhtar magmatic arc, northwestern Iran".LITHOS 450(2023):13.

入库方式： OAI收割

来源：地质与地球物理研究所

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