Identification of intermediate-silicic cumulates in the Emeishan large igneous province, SW China
文献类型：期刊论文
| 作者 | Pang, Kwan-Nang4; Sun, Yang3; Wang, Christina Yan2; Chung, Sun-Lin1,4; Lee, Hao-Yang4 |
| 刊名 | LITHOS
 |
| 出版日期 | 2025-02-01 |
| 卷号 | 494页码:13 |
| 关键词 | Cumulate Volcanic-plutonic connection Emeishan large igneous province Geochemistry Panzhihua Syenite |
| ISSN号 | 0024-4937 |
| DOI | 10.1016/j.lithos.2024.107932 |
| 英文摘要 | Geochemical signatures of crystal accumulation in silicic igneous rocks are subtle and difficult to discern. However, the presence of silicic cumulates is required to explain the formation of silicic magmas by fractionation-dominated mechanisms. In large igneous provinces, such rock records are scarce if ever reported. In this study, we document a case example of identifying intermediate-silicic cumulates in the end-Guadalupian (similar to 260 Ma) Emeishan large igneous province, SW China. We demonstrate that syenitic rocks associated with the Panzhihua intrusion have textures and trace element geochemistry consistent with origins involving both crystal accumulation and melt extraction. Micro-X-ray fluorescence mapping shows that the rocks are either supported by a framework of interconnected, relatively large crystals of alkali feldspar, or by a fine- to medium-grained matrix. The former has relatively low SiO2, relatively high TiO2, Fe2O3, CaO, Na2O, Sr and Ba, and a characteristic positive Eu anomaly, whereas the latter has essentially the opposite features. All studied rocks have restricted initial Sr-Nd-Pb isotopic ratios that are similar to mafic rocks of the Panzhihua intrusion, requiring minimal contamination by the Precambrian basement of the Yangtze block. Because of delayed zircon saturation, Zr and Zr/Hf are less promising compared with Eu/Eu* and Ba in identifying cumulates in the studied rocks, a view that might hold in other intraplate magmatic systems. Our results, combined with available data, improve the current understanding of volcanic-plutonic connection concerning silicic magma types of the Emeishan large igneous province. |
| WOS研究方向 | Geochemistry & Geophysics ; Mineralogy |
| 语种 | 英语 |
| WOS记录号 | WOS:001423250800001 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/82687]  |
| 专题 | 中国科学院矿物学与成矿学重点实验室 |
| 通讯作者 | Pang, Kwan-Nang |
| 作者单位 | 1.Natl Taiwan Univ, Dept Geosci, Taipei 10617, Taiwan 2.Chinese Acad Sci, Guangzhou Inst Geochem, Key Lab Mineral & Metallogeny, Guangzhou 510640, Peoples R China 3.Yangtze Univ, Sch Geosci, Wuhan 430100, Hubei, Peoples R China 4.Acad Sinica, Inst Earth Sci, Taipei 11529, Taiwan |
| 推荐引用方式 GB/T 7714 | Pang, Kwan-Nang,Sun, Yang,Wang, Christina Yan,et al. Identification of intermediate-silicic cumulates in the Emeishan large igneous province, SW China[J]. LITHOS,2025,494:13. |
| APA | Pang, Kwan-Nang,Sun, Yang,Wang, Christina Yan,Chung, Sun-Lin,&Lee, Hao-Yang.(2025).Identification of intermediate-silicic cumulates in the Emeishan large igneous province, SW China.LITHOS,494,13. |
| MLA | Pang, Kwan-Nang,et al."Identification of intermediate-silicic cumulates in the Emeishan large igneous province, SW China".LITHOS 494(2025):13. |
入库方式： OAI收割
来源：广州地球化学研究所
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