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Age and origin of a Palaeozoic nepheline syenite from northern Shanxi Province, China: U–Pb zircon age and whole-rock geochemical and Sr–Nd isotopic constraints
Shen Liu;  Ruizhong Hu;  Shan Gao;  Caixia Feng;  Ian M. Coulson;  Guangying Feng;  Yuhong Yang;  Youqiang Qi;  Chaogui Yang;  Liang Tang
2012
Source PublicationInternational Geology Review
Volume54Issue:11Pages:1296–1308
Abstract

Geochronological, geochemical, and whole-rock Sr–Nd isotopic analyses were performed on a suite of Palaeozoic nepheline syenites from Zijinshan to characterize their ages and petrogenesis. Laser ablation inductively coupled plasma-mass spectrometry U–Pb zircon analyses yield consistent ages of 525.7 ± 2.8 million years for a sample (HYK01). These intrusive rocks belong to the foid syenite magma series in terms of K2O + Na2O contents (14.3–15.2 wt.%) and to the shoshonitic series based on their high K2O contents (5.42–5.61 wt.%). The nepheline syenites are further characterized by high light rare earth element contents [(La/Yb)N = 29.1–36.1]; show modest negative Eu anomalies (δEu = 0.5–0.6) and positive anomalies in Rb, Th, U, Pb, Zr, and Hf; are depleted in Ba and high field strength elements (P and Ti). In addition, all the nepheline syenites in this study display relatively low radiogenic Sr (87Sr/86Sr)i (0.7042–0.7043) and positive εNd (t) (0.7–0.8). These results suggest that the nepheline syenites were derived from depleted continental crust. The parent magmas likely experienced fractional crystallization of plagioclase, Ti-bearing oxides (e.g. rutile, ilmenite, and titanite), apatite, and zircon during ascent, with negligible crustal contamination before final emplacement at a high crustal level. 

KeywordNepheline Syenites Petrogenesis Palaeozoic Shanxi Province North China Craton
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/8243
Collection矿床地球化学国家重点实验室
Affiliation1.State Key Laboratory of Ore Deposit Geochemistry , Institute of Geochemistry, Chinese Academy of Sciences , Guiyang , 550002 , PR China
2.State Key Laboratory of Geological Processes and Mineral Resources , China University of Geosciences , Wuhan , 430074 , PR China
3.State Key Laboratory of Geological Processes and Mineral Resources , China University of Geosciences , Wuhan , 430074 , PR China
Recommended Citation
GB/T 7714
Shen Liu;Ruizhong Hu;Shan Gao;Caixia Feng;Ian M. Coulson;Guangying Feng;Yuhong Yang;Youqiang Qi;Chaogui Yang;Liang Tang. Age and origin of a Palaeozoic nepheline syenite from northern Shanxi Province, China: U–Pb zircon age and whole-rock geochemical and Sr–Nd isotopic constraints[J]. International Geology Review,2012,54(11):1296–1308.
APA Shen Liu;Ruizhong Hu;Shan Gao;Caixia Feng;Ian M. Coulson;Guangying Feng;Yuhong Yang;Youqiang Qi;Chaogui Yang;Liang Tang.(2012).Age and origin of a Palaeozoic nepheline syenite from northern Shanxi Province, China: U–Pb zircon age and whole-rock geochemical and Sr–Nd isotopic constraints.International Geology Review,54(11),1296–1308.
MLA Shen Liu;Ruizhong Hu;Shan Gao;Caixia Feng;Ian M. Coulson;Guangying Feng;Yuhong Yang;Youqiang Qi;Chaogui Yang;Liang Tang."Age and origin of a Palaeozoic nepheline syenite from northern Shanxi Province, China: U–Pb zircon age and whole-rock geochemical and Sr–Nd isotopic constraints".International Geology Review 54.11(2012):1296–1308.
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