| Signatures of the source for the Emeishan flood basalts in the Ertan area： Pb isotope evidence |
| |
| 引用本文： | 严再飞,黄智龙,许成,陈觅,张振亮.Signatures of the source for the Emeishan flood basalts in the Ertan area： Pb isotope evidence[J].中国地球化学学报,2007,26(2):207-213. |
| |
| 作者姓名： | 严再飞 黄智龙 许成 陈觅 张振亮 |
| |
| 作者单位： | State Key Laboratory of Ore Deposit Geochemistry Institute of Geochemistry Chinese Academy of Sciences，State Key Laboratory of Ore Deposit Geochemistry Institute of Geochemistry Chinese Academy of Sciences，State Key Laboratory of Ore Deposit Geochemistry Institute of Geochemistry Chinese Academy of Sciences，State Key Laboratory of Ore Deposit Geochemistry Institute of Geochemistry Chinese Academy of Sciences，State Key Laboratory of Ore Deposit Geochemistry Institute of Geochemistry Chinese Academy of Sciences，Guiyang 550002 China Graduate School Chinese Academy of Sciences Beijing 100039 China，Guiyang 550002 China，Guiyang 550002 China，Guiyang 550002 China Graduate School Chinese Academy of Sciences Beijing 100039 China，Guiyang 550002 China Graduate School Chinese Academy of Sciences Beijing 100039 China |
| |
| 基金项目： | Acknowledgements The authors wish to thank Dr. Chu Zhuying from the Laboratory for Radiogenic Isotope Geochemistry, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, for his help. This research project was granted by the National Natural Science Foundation of China （Nos. 40372048 and 40573036）. |
| |
| 摘 要： | The Emeishan flood basalts can be divided into high-Ti (HT) basalt (Ti/Y>500) and low-Ti (LT) basalt (Ti/Y<500). Sr, Nd isotopic characteristics of the lavas indicate that the LT- and the HT-type magmas originated from distinct mantle sources and parental magmas. The LT-type magma was derived from a shallower lithospheric mantle, whereas the HT-type magma was derived from a deeper mantle source that may be possibly a mantle plume. However, few studies on the Emeishan flood basalts involved their Pb isotopes, especially the Ertan basalts. In this paper, the authors investigated basalt samples from the Ertan area in terms of Pb isotopes, in order to constrain the source of the Emeishan flood basalts. The ratios of 206Pb/204Pb (18.31–18.41), 207Pb/204Pb (15.55–15.56) and 208Pb/204Pb (38.81–38.94) are significantly higher than those of the depleted mantle, just lying between EM I and EM II. This indicates that the Emeishan HT basalts (in the Ertan area) are the result of mixing of EMI end-member and EMII end-member.
|
| 关 键 词： | 二滩地区 峨眉山洪水玄武岩 Pb同位素 来源 特征 富集地幔 |
| 收稿时间： | 2006-04-18 |
| 修稿时间： | 2006-05-10 |
Signatures of the source for the Emeishan flood basalts in the Ertan area: Pb isotope evidence |
| |
| Yan?Zaifei,Huang?Zhilong,Xu?Cheng,Chen?Mi,Zhang?Zhenliang.Signatures of the source for the Emeishan flood basalts in the Ertan area: Pb isotope evidence[J].Chinese Journal of Geochemistry,2007,26(2):207-213. |
| |
| Authors: | Yan Zaifei Huang Zhilong Xu Cheng Chen Mi Zhang Zhenliang |
| |
| Institution: | (1) State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550002, China;(2) Graduate School, Chinese Academy of Sciences, Beijing, 100039, China |
| |
| Abstract: | The Emeishan flood basalts can be divided into high-Ti (HT) basalt (Ti/Y>500) and low-Ti (LT) basalt (Ti/Y<500). Sr, Nd isotopic
characteristics of the lavas indicate that the LT-and the HT-type magmas originated from distinct mantle sources and parental
magmas. The LT-type magma was derived from a shallower lithospheric mantle, whereas the HT-type magma was derived from a deeper
mantle source that may be possibly a mantle plume. However, few studies on the Emeishan flood basalts involved their Pb isotopes,
especially the Ertan basalts. In this paper, the authors investigated basalt samples from the Ertan area in terms of Pb isotopes,
in order to constrain the source of the Emeishan flood basalts. The ratios of 206Pb/204Pb (18.31–18.41), 207Pb/204Pb (15.55–15.56) and 208Pb/204Pb (38.81–38.94) are significantly higher than those of the depleted mantle, just lying between EM I and EM II. This indicates
that the Emeishan HT basalts (in the Ertan area) are the result of mixing of EMI end-member and EMII end-member. |
| |
| Keywords: | LT and HT basalts Ertan basalts geochemistry Pb isotope enriched mantle |
| 本文献已被 CNKI 维普 SpringerLink 等数据库收录！ |
|
