| 同位素地球化学在峨眉山大火成岩省研究中的应用现状与进展 |
| |
| 引用本文： | 尤敏鑫,刘建民.同位素地球化学在峨眉山大火成岩省研究中的应用现状与进展[J].吉林大学学报(地球科学版),2014,44(4):1231. |
| |
| 作者姓名： | 尤敏鑫 刘建民 |
| |
| 作者单位： | 中国地质科学院地质力学研究所，北京100081 |
| |
| 基金项目： | 科技部国际合作与交流专项（2014DFR21270）；中国地质调查局地质调查工作项目（1212011120183） |
| |
| 摘 要： | 系统总结分析了峨眉山大火成岩省的同位素地球化学研究成果。总结前人研究资料中大量峨眉山大火成岩省（ELIP）中玄武岩和侵入体的同位素年龄数据，并结合生物地层学特征，确认我国西南峨眉山大火成岩省中的各个岩石单元的形成时代为251~263 Ma，其中基性-超基性侵入岩体形成于约259 Ma，而作为峨眉山大火成岩省主体的峨眉山玄武岩系形成于251~253 Ma。Sr-Nd、Re-Os、Lu-Hf及O同位素地球化学数据表明峨眉山大火成岩省的源区为地幔柱或者大陆岩石圈地幔(SCLM)，其中峨眉山玄武岩与富含Fe-Ti氧化物基性侵入体的Sr-Nd同位素特征相似，具有与OIB相似的同位素性质；而含Cu-Ni硫化物的基性-超基性岩体的同位素特征接近地壳物质，可能与地壳混染作用有关。
|
| 关 键 词： | 峨眉山大火成岩省 同位素地球化学 年代学 成因 |
| 收稿时间： | 2013-10-20 |
Application Status and Progress of Isotopic Geochemistry in Research of Emeishan Large Igneous Province (ELIP) |
| |
| You Minxin,Liu Jianmin.Application Status and Progress of Isotopic Geochemistry in Research of Emeishan Large Igneous Province (ELIP)[J].Journal of Jilin Unviersity:Earth Science Edition,2014,44(4):1231. |
| |
| Authors: | You Minxin Liu Jianmin |
| |
| Institution: | Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing100081，China |
| |
| Abstract: | The authors had systematically summarize and analyze the previous research results of isotopic geochemistry in Emeishan large igneous province (ELIP). According to the isotopic geochemical data of basalt and intrusions in ELIP, combined with its biostratigraphy, we propose a rough period of 251-263 Ma as the formation age of each rock unit in ELIP. Mafic-ultramafic instrusions in ELIP formed in ~259 Ma, and the basalts, which was viewed as the bulk of ELIP formed in 251-253 Ma. The isotopic geochemical data of Sr-Nd, Re-Os, Lu-Hf and O indicate that the ELIP originate from either mantle plume or subcontinental lithosphere mantle (SCLM). The Emeishan basalts show similar Sr-Nd isotopic characteristcs to the mafic intrutions which is rich of Fe-Ti oxide; and the mafic ultramafic instrusions bearing Cu-Ni sulfides are closer to crust material, which might be related to crust contamination. |
| |
| Keywords: | Emeishan large igneous province isotopic geochemistry geochronology causes |
|
| 点击此处可从《吉林大学学报(地球科学版)》浏览原始摘要信息 |
| 点击此处可从《吉林大学学报(地球科学版)》下载免费的PDF全文 |
