Geochemical and Sr-Nd Isotopic Characteristics of Dongbei Basalts in <?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" /><st1:place w:st="on"><st1:City w:st="on">Huichang Area</st1:City>, <st1:State w:st="on">Jiangxi</st1:State></st1:place> Province, and Their Geological Implications <?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p>

line-level: 2" class=MsoNormal>Geochemical and Sr-Nd Isotopic Characteristics of Dongbei Basalts in oft-com:office:smarttags" />Huichang Area, Jiangxi Province, and Their Geological Implications oft-com:office:office" />

详细信息

责任者：Li Yinqi (Department of Earth Sciences ; Zhejiang University ; Hangzhou 310027 ; China) ; Li Zilong
刊名：Mineral Deposits
出版年：2009
卷期：28(5)
关键词：玄武岩 ; basalts ; 江西 ; Jiangxi Province
页码：p.696-706
图表：8 illus., 2 tables, 38 refs.
分类号：0801
issnNo：ISSN0258-7106
isbnNo：CN11-1965/P

摘要

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The Late Mesozoic Dongbei basalts, located in Huichang area of Jiangxi Province, have SiO₂ contents of 49.06%～50.14% and K₂O 1.26%～1.63%. They are rich in large-ion lithosphile elements and poor in high field strength elements, and have ∑REE of (135.5～146.8)×10^-6, (La/Yb)N of ca. 10 and LREE enrichment, with strong negative Nb and Ta anomalies and no obvious Eu anomalies in the MORB-normalized spider diagram. The Sr-Nd isotopic compositions show that Dongbei basalts have high initial ⁸⁷Sr/⁸⁶Sr ratios of 0.706 78～0.706 95 and low εNd(t) of -2.46～-2.18. These geochemical characteristics indicate that the Dongbei basalts might have been derived from the source of EMⅡ-type lithospheric mantle under the tectonic setting of an active continental margin.

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