Mixing and mingling in petrogenesis of the Fangshan intrusion, Beijing.
文献类型：期刊论文
| 作者 | Qin Feng; Xu XiaoXia; Luo ZhaoHua |
| 刊名 | ACTA PETROLOGICA SINICA
 |
| 出版日期 | 2006-12-01 |
| 卷号 | 22期号:12页码:2957-2970 |
| 关键词 | Fangshan intrusion granite dusty zone plagioclase mafic microgranular enclave electron microprobe analyze |
| ISSN号 | 1000-0569 |
| 文献子类 | Article |
| 英文摘要 | The Fangshan intrusion is mainly composed of a quartz monzodiorite unit and three granodiorite units with different structures. Macroscopic characteristics such as ubiquitous mafic microgranular enclaves, linear bands rich in mafic minerals, and the contact relationships between adjacent petrographic units indicate that the origin of the pluton is closely related to magma mixing. The electron mieroprobe profiles consisting of 122 plagioclase compositional points illustrate the range of An with a population mean of An29 (oligoclase). However, the plagioclases show an extremely wide range of compositional variation ( An = 14 similar to 56), and different parts of a plagioclase crystal exhibit rather different composition. The normal zone of the plagioclase has a lower An content (14 similar to 42), while the An content of the spike is much higher (24 similar to 56), indicating the participation of Ca-rich basic magma. The An amounts of the plagioclase crystals decrease gradually from the early to the late stages. However, the compositional ranges of plagioclases in the adjacent overlap one on another, implying the compositional control of plagioclases in different units by magma compositions instead of fractional crystallization. Plagioclase's oscillatory zone, especially the growth of spike, is powerful evidence of the magma mixing. The repeating injections of mafic magma not only modified the chemistry of host magma, but controlled its temperature, emplacement and structure futures of the rocks. Therefore, instead of fractional crystallization, the processes to form Fangshan intrusion include a history of multiple magma injections, and the effect of basic magma on the units granularly decreased from the outer to the inner. |
| WOS关键词 | CRYSTALLIZATION HISTORY ; PLAGIOCLASE ; MAGMA ; GRANITE ; TEXTURES ; ORIGIN ; ROCKS ; DISEQUILIBRIUM ; EMPLACEMENT ; DIFFUSION |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000245660400013 |
| 出版者 | SCIENCE CHINA PRESS |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/66718]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Qin Feng |
| 作者单位 | 1.China Univ Geosci, State Key Lab Geoproc & Mineral Resources, Beijing 100083, Peoples R China 2.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China 3.Chinese Acad Sci, Inst Tibetan Plateau Res, Beijing 100085, Peoples R China |
| 推荐引用方式 GB/T 7714 | Qin Feng,Xu XiaoXia,Luo ZhaoHua. Mixing and mingling in petrogenesis of the Fangshan intrusion, Beijing.[J]. ACTA PETROLOGICA SINICA,2006,22(12):2957-2970. |
| APA | Qin Feng,Xu XiaoXia,&Luo ZhaoHua.(2006).Mixing and mingling in petrogenesis of the Fangshan intrusion, Beijing..ACTA PETROLOGICA SINICA,22(12),2957-2970. |
| MLA | Qin Feng,et al."Mixing and mingling in petrogenesis of the Fangshan intrusion, Beijing.".ACTA PETROLOGICA SINICA 22.12(2006):2957-2970. |
入库方式： OAI收割
来源：地质与地球物理研究所
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