Mantle transition zone -derived EM1 component beneath NE China: Geochemical evidence from Cenozoic potassic basalts
文献类型：期刊论文
| 作者 | Wang, Xiao-Jun1; Chen, Li-Hui1; Hofmann, Albrecht W.2; Mao, Fu-Gen1; Liu, Jian-Qiang1; Zhong, Yuan1; Xie, Lie-Wen3; Yang, Yue-Heng3 |
| 刊名 | EARTH AND PLANETARY SCIENCE LETTERS
 |
| 出版日期 | 2017-05-01 |
| 卷号 | 465页码:16-28 |
| ISSN号 | 0012-821X |
| 关键词 | potassic basalt EM1 Mg isotopes melt-lithosphere interaction recycled ancient sediment mantle transition zone |
| DOI | 10.1016/j.epsl.2017.02.028 |
| 文献子类 | Article |
| 英文摘要 | The isotopic characteristics of the sub-oceanic mantle are well established, but in continental regions these properties are usually obscured, and therefore controversial, because of the potential effects of crustal contamination together with lithospheric mantle metasomatism and melting. The so-called EM1 (Enriched Mantle-1) signature, characterized by low (206)pb/(204)pb and Nd-143/Nd-144 ratios, is particularly problematic in this respect because EM1-type OIB sources are commonly attributed to recycled crust and/or lithospheric mantle. In this paper we show that a suite of Cenozoic potassic basalts from NE China displays many previously unrecognized correlations between chemical and isotopic parameters, which tightly constrain the isotopic characteristics of an extreme EM1-type mantle source located in the asthenosphere. Its radiogenic isotopes are similar to, but even more extreme than, those of the oceanic endmember composition represented by the Pitcairn hotspot, namely Pb-206/Pb-204 <= 16.5, Nd-143/Nd-144 <= 0.5123 (or epsilon Nd <= -6.4), (176)/Hf-177 Hf <= 0.2825 (or epsilon Hf <= -10.1). These characteristics require a source of recycled crustal material of Precambrian age (similar to 2.2 Ga). An important new constraint is the Mg isotopic composition of delta Mg-26 (<=-0.6%(0)), which is lower than normal mantle (delta Mg-26 = -0.25 0.07%(o)) and lower crustal values (delta Mg-26 = 0.29 +/- 0.15%(o)), but consistent with sedimentary carbonate (delta Mg-26 = -5.57%(o) to -0.38%(o)). The endmember EM1 source produced high-SiO2 melts with low MgO, CaO/Al2O3 and delta Mg-26 values, exceptionally high K/U congruent to 50,000, Ba/Th congruent to 400, low U/Pb congruent to 0.06, and positive Zr and Hf anomalies. The chemical and isotopic parameters of this potassic basalt suite form binary mixing arrays, one end point of which is the inferred asthenospheric EM1 reservoir, whereas the other is a more ordinary, depleted mantle component, which is also sampled by local lithospheric mantle xenoliths. These binary arrays include well-developed correlations between Sr, Nd, Hf, Pb and Mg isotopes, negative correlations of Pb-206/Pb-204 with K2O, K/U, Hf/Hf*, positive correlations of delta Mg-26 with MgO, and Nd-143/Nd-144 with Fe2O3T and U/Pb. |
| WOS关键词 | MAGNESIUM ISOTOPIC HETEROGENEITY ; ULTRAPOTASSIC VOLCANIC-ROCKS ; TRACE-ELEMENT SYSTEMATICS ; SUBDUCTED OCEANIC-CRUST ; NORTHEAST CHINA ; EASTERN CHINA ; LITHOSPHERIC MANTLE ; MAJOR-ELEMENT ; MAGMA GENESIS ; SOUTH-KOREA |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| 出版者 | ELSEVIER SCIENCE BV |
| WOS记录号 | WOS:000400202600002 |
| 资助机构 | National Natural Science Foundation of China(41672049 ; State Key Laboratory for Mineral Deposits Research (Nanjing University)(ZZKT-201307) ; 41688103) ; National Natural Science Foundation of China(41672049 ; State Key Laboratory for Mineral Deposits Research (Nanjing University)(ZZKT-201307) ; 41688103) ; National Natural Science Foundation of China(41672049 ; State Key Laboratory for Mineral Deposits Research (Nanjing University)(ZZKT-201307) ; 41688103) ; National Natural Science Foundation of China(41672049 ; State Key Laboratory for Mineral Deposits Research (Nanjing University)(ZZKT-201307) ; 41688103) |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/42206]  |
| 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 | Chen, Li-Hui; Hofmann, Albrecht W. |
| 作者单位 | 1.Nanjing Univ, Sch Earth Sci & Engn, State Key Lab Mineral Deposits Res, Nanjing 210023, Jiangsu, Peoples R China 2.Max Planck Inst Chem, Abt Klimageochem, D-55128 Mainz, Germany 3.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wang, Xiao-Jun,Chen, Li-Hui,Hofmann, Albrecht W.,et al. Mantle transition zone -derived EM1 component beneath NE China: Geochemical evidence from Cenozoic potassic basalts[J]. EARTH AND PLANETARY SCIENCE LETTERS,2017,465:16-28. |
| APA | Wang, Xiao-Jun.,Chen, Li-Hui.,Hofmann, Albrecht W..,Mao, Fu-Gen.,Liu, Jian-Qiang.,...&Yang, Yue-Heng.(2017).Mantle transition zone -derived EM1 component beneath NE China: Geochemical evidence from Cenozoic potassic basalts.EARTH AND PLANETARY SCIENCE LETTERS,465,16-28. |
| MLA | Wang, Xiao-Jun,et al."Mantle transition zone -derived EM1 component beneath NE China: Geochemical evidence from Cenozoic potassic basalts".EARTH AND PLANETARY SCIENCE LETTERS 465(2017):16-28. |
入库方式： OAI收割
来源：地质与地球物理研究所
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