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Geochemistry of continental alkali basalts in the Sabzevar region, northern Iran: implications for the role of pyroxenite in magma genesis
Rostami-Hossouri, Mojtaba1; Ghasemi, Habibollah1; Pang, Kwan-Nang2; Shellnutt, J. Gregory3; Rezaei-Kahkhaei, Mehdi1; Miao, Laicheng4; Mobasheri, Mohsen1; Iizuka, Yoshiyuki2; Lee, Hao-Yang2; Lin, Te-Hsien5
2020-04-28
Source PublicationCONTRIBUTIONS TO MINERALOGY AND PETROLOGY
ISSN0010-7999
Volume175Issue:5Pages:22
AbstractA 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.
KeywordAlkali basalt Geochemistry Pyroxenite Sabzevar Iran
DOI10.1007/s00410-020-01687-z
Funding OrganizationMinistry 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
WOS KeywordARABIA-EURASIA COLLISION ; PARTIAL MELTING EXPERIMENTS ; LUT-SISTAN REGION ; GARNET PYROXENITE ; TECTONIC EVOLUTION ; VOLCANIC-ROCKS ; NE IRAN ; ISOTOPIC CONSTRAINTS ; MAFIC LITHOLOGIES ; SIERRA-NEVADA
Language英语
Funding ProjectMinistry of Science and Technology of Iran ; Shahrood University of Technology ; Ministry of Science and Technology, Taiwan[105-2628-M-001-002-MY4]
Funding OrganizationMinistry 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
WOS Research AreaGeochemistry & Geophysics ; Mineralogy
WOS SubjectGeochemistry & Geophysics ; Mineralogy
WOS IDWOS:000529326700001
PublisherSPRINGER
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/96248
Collection矿产资源研究院重点实验室
Corresponding AuthorPang, Kwan-Nang
Affiliation1.Shahrood Univ Technol, Fac Earth Sci, Shahrood, Iran
2.Acad Sinica, Inst Earth Sci, Taipei 11529, Taiwan
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
Recommended Citation
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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