Temporal variations and petrogenetic implications in Changbai basaltic rocks since the Pliocene
文献类型：期刊论文
| 作者 | Guo WenFeng; Liu JiaQi; Guo ZhengFu |
| 刊名 | ACTA PETROLOGICA SINICA
 |
| 出版日期 | 2014-12-01 |
| 卷号 | 30期号:12页码:3595-3611 |
| 关键词 | Basaltic magma Temporal variations Crustal assimilation Energy-constrained recharge, assimilation and fractional crystallization (ECRAFC) modeling Changbai volcanoes |
| ISSN号 | 1000-0569 |
| 文献子类 | Article |
| 英文摘要 | The compositional diversity of volcanic rocks reflects the complex interactions between physical and chemical processes during magma generation, ascent, storage and eruption. Since 5 million years, Changbai volcanoes (including Mount Tianchi, Mount Wangtian'e and Mount Nampotae) erupt a lot of basaltic rocks. Their compositions vary significantly (3.2% similar to 7.8% MgO). Previous studies suggested that the compositional variation is mainly controlled by mantle heterogeneity, differences in the degree of partial melting and fractional crystallization, with no significant crustal assimilation. This study found that these basalts experienced varied degrees of upper and lower crustal contamination. Meanwhile, the geochemical and isotopic composition show consistently temporal variations, which can be divided into three stages: 5 similar to 2Ma, 2 similar to 1Ma and 1 similar to 0Ma, base on Sr-87/Sr-86 ratio and MgO concentration. By qualitative and quantitative geochemical examination and modeling, we found that the cyclic geochemical variation is mainly related to open-system magmatic processes, including fractional crystallization, crustal contamination and magma recharge, instead of mantle source heterogeneity and differences in degree of partial melting. To understand the detail magma stall and transportation information the cyclic variations record, we conducted energy-constrained recharge, assimilation and fractional crystallization (ECRAFC) modeling and found the best fit trajectories defined by the Sr-isotopic and Sr trace-element composition of 5 similar to 0Ma Changbai basalts. Our results indicate that; The parental basaltic magma of Tianchi and Wangtian' e eruption center initially store in a connected low-crustal magma reservoir, though they separated each other in upper-cruatal reservoir related to heterogeneity of regional tectonics; Magmatic storage systems of Changbai is progressively shallower from lower to upper-crust in 5 similar to 2Ma, and quickly deeper from upper to lower-crust in 2 similar to 1Ma; During 1 similar to 0Ma stage, the basaltic magma mainly restore in the lower-crust; The cyclic geochemical variation of basaltic magma during the last 5Ma is closely related the periodic stress-shift of regional faults, from fast to slow extending. |
| WOS关键词 | CENOZOIC VOLCANIC-ROCKS ; IONIZATION MASS-SPECTROMETRY ; FRACTIONAL CRYSTALLIZATION ; MAGMATIC PROCESSES ; NORTHEAST CHINA ; TRACE-ELEMENTS ; CHEMICAL CLASSIFICATION ; GEOLOGICAL SAMPLES ; WANGTIANE VOLCANO ; TIANCHI VOLCANO |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000347270400010 |
| 出版者 | SCIENCE PRESS |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/84844]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Guo WenFeng |
| 作者单位 | Chinese Acad Sci, Inst Geol & Geophys, Key Lab Cenozo Geol & Environm, Beijing 100029, Peoples R China |
| 推荐引用方式 GB/T 7714 | Guo WenFeng,Liu JiaQi,Guo ZhengFu. Temporal variations and petrogenetic implications in Changbai basaltic rocks since the Pliocene[J]. ACTA PETROLOGICA SINICA,2014,30(12):3595-3611. |
| APA | Guo WenFeng,Liu JiaQi,&Guo ZhengFu.(2014).Temporal variations and petrogenetic implications in Changbai basaltic rocks since the Pliocene.ACTA PETROLOGICA SINICA,30(12),3595-3611. |
| MLA | Guo WenFeng,et al."Temporal variations and petrogenetic implications in Changbai basaltic rocks since the Pliocene".ACTA PETROLOGICA SINICA 30.12(2014):3595-3611. |
入库方式： OAI收割
来源：地质与地球物理研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。