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Geochemistry of continental alkali basalts in the Sabzevar region, northern Iran: implications for the role of pyroxenite in magma genesis

文献类型：期刊论文

作者Rostami-Hossouri, Mojtaba2; Ghasemi, Habibollah2; Pang, Kwan-Nang1; Shellnutt, J. Gregory3; Rezaei-Kahkhaei, Mehdi2; Miao, Laicheng4; Mobasheri, Mohsen2; Iizuka, Yoshiyuki1; Lee, Hao-Yang1; Lin, Te-Hsien5
刊名CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
出版日期2020-04-28
卷号175期号:5页码:22
关键词Alkali basalt Geochemistry Pyroxenite Sabzevar Iran
ISSN号0010-7999
DOI10.1007/s00410-020-01687-z
英文摘要A geochemical study was undertaken on basaltic lava flows intercalated with Oligocene to Miocene strata in the Sabzevar region, northern Iran, to examine their petrogenesis in a regional tectonic framework. The lavas are either aphyric or have phenocrysts and micro-phenocrysts of olivine and, to a lesser extent, clinopyroxene. Geochemically, the lavas are silica-undersaturated alkali basalts characterized by relatively high Mg# (similar to 57-66) and Na2O/K2O (similar to 2.0-6.7). They have distinctive trace element patterns characterized by strong rare-earth element fractionation, negative Nb-Ta and Zr-Hf anomalies and a positive Sr anomaly. Significant contamination by crustal materials either in the magma source or during ascent is ruled out on the basis of trace element compositions and Sr-Nd isotopic compositions (Sr-87/Sr-86 = 0.7037-0.7048 and Nd-143/Nd-144 = 0.5128-0.5130), both of which differ markedly from continental crustal rocks. Phenocryst assemblage, analysis of multiple saturation points in lherzolite systems, and covariations of La/Yb with MgO of the studied lavas are generally consistent with an origin involving high-pressure fractionation of peridotite-derived melts. Primary magma compositions calculated by reversed fractionation of clinopyroxene and olivine for the relatively primitive samples (> 9 wt.% MgO), however, do not plot on the lherzolite multiple saturation points. Also, high-pressure fractionation predicts increasing trends of silica undersaturation and alkalinitiy with differentiation, and such trends are not indicated by the geochemical data. We suggest that the mixed trends shown by the data might be related to melt generation from both peridotite and silica-deficient pyroxenite sources, superimposed by variable degrees of high-pressure fractionation. The role of pyroxenite in magma genesis is indicated not only by the positive Sr anomaly shown by the trace element patterns, but also first-row transition element systematics of the studied lavas. The silica-deficient pyroxenites contributing to melt generation might have been transformed from mafic-ultramafic cumulates in subducted, lower oceanic crust, or might have formed in the lower crust or mantle lithosphere under continents during earlier magmatic episodes.
WOS关键词ARABIA-EURASIA COLLISION ; PARTIAL MELTING EXPERIMENTS ; LUT-SISTAN REGION ; GARNET PYROXENITE ; TECTONIC EVOLUTION ; VOLCANIC-ROCKS ; NE IRAN ; ISOTOPIC CONSTRAINTS ; MAFIC LITHOLOGIES ; SIERRA-NEVADA
资助项目Ministry of Science and Technology of Iran ; Shahrood University of Technology ; Ministry of Science and Technology, Taiwan[105-2628-M-001-002-MY4]
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
WOS记录号WOS:000529326700001
出版者SPRINGER
资助机构Ministry of Science and Technology of Iran ; Ministry of Science and Technology of Iran ; Shahrood University of Technology ; Shahrood University of Technology ; Ministry of Science and Technology, Taiwan ; Ministry of Science and Technology, Taiwan ; Ministry of Science and Technology of Iran ; Ministry of Science and Technology of Iran ; Shahrood University of Technology ; Shahrood University of Technology ; Ministry of Science and Technology, Taiwan ; Ministry of Science and Technology, Taiwan ; Ministry of Science and Technology of Iran ; Ministry of Science and Technology of Iran ; Shahrood University of Technology ; Shahrood University of Technology ; Ministry of Science and Technology, Taiwan ; Ministry of Science and Technology, Taiwan ; Ministry of Science and Technology of Iran ; Ministry of Science and Technology of Iran ; Shahrood University of Technology ; Shahrood University of Technology ; Ministry of Science and Technology, Taiwan ; Ministry of Science and Technology, Taiwan
源URL[http://ir.iggcas.ac.cn/handle/132A11/96248]  
专题地质与地球物理研究所_中国科学院矿产资源研究重点实验室
通讯作者Pang, Kwan-Nang
作者单位1.Acad Sinica, Inst Earth Sci, Taipei 11529, Taiwan
2.Shahrood Univ Technol, Fac Earth Sci, Shahrood, Iran
3.Natl Taiwan Normal Univ, Dept Earth Sci, Taipei, Taiwan
4.Chinese Acad Sci, Inst Geol & Geophys, Beijing, Peoples R China
5.Natl Taiwan Univ, Dept Geosci, Taipei 10617, Taiwan
推荐引用方式
GB/T 7714		 Rostami-Hossouri, Mojtaba,Ghasemi, Habibollah,Pang, Kwan-Nang,et al. Geochemistry of continental alkali basalts in the Sabzevar region, northern Iran: implications for the role of pyroxenite in magma genesis[J]. CONTRIBUTIONS TO MINERALOGY AND PETROLOGY,2020,175(5):22.
APA Rostami-Hossouri, Mojtaba.,Ghasemi, Habibollah.,Pang, Kwan-Nang.,Shellnutt, J. Gregory.,Rezaei-Kahkhaei, Mehdi.,...&Lin, Te-Hsien.(2020).Geochemistry of continental alkali basalts in the Sabzevar region, northern Iran: implications for the role of pyroxenite in magma genesis.CONTRIBUTIONS TO MINERALOGY AND PETROLOGY,175(5),22.
MLA Rostami-Hossouri, Mojtaba,et al."Geochemistry of continental alkali basalts in the Sabzevar region, northern Iran: implications for the role of pyroxenite in magma genesis".CONTRIBUTIONS TO MINERALOGY AND PETROLOGY 175.5(2020):22.

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来源：地质与地球物理研究所

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