Magnetic study of mafic granulite xenoliths from the Hannuoba basalt, north China
文献类型：期刊论文
| 作者 | Liu, Qingsheng1; Liu, Qingsong2; Liu, Yongsheng3; Gao, Shan3,4; Yang, Tao1; Luo, Yinhe1; Jin, Zhenmin3 |
| 刊名 | GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
 |
| 出版日期 | 2008-06-21 |
| 卷号 | 9 |
| 关键词 | mafic granulite xenolith rock magnetism opaque mineralogy fractional crystallization Hannuoba north China |
| ISSN号 | 1525-2027 |
| DOI | 10.1029/2008GC001952 |
| 文献子类 | Article |
| 英文摘要 | [1] The composition and structure of the lower continental crust are of great interest in understanding the dynamic processes of the Earth interior. In this study, we examined relationships between the magnetic properties and opaque mineralogy of a set of mafic granulite xenoliths ( derived from similar to 24-41 km) collected from the Hannuoba region, north China ( a region well known for its exposures of lower crustal rocks). These mafic granulite xenoliths are weakly magnetic with an average magnetic susceptibility ( c, mass specific) and saturation isothermal remanent magnetization ( SIRM) of 5.87 x 10(-7) m(3)kg(-1) and 31.53 x 10(-4) Am-2 kg(-1), respectively. The opaque minerals identified by electron microprobe (EMP) analysis in mafic granulite xenoliths are mainly paramagnetic Mg-rich ilmenite, which significantly contributed the room temperature c. In contrast, SIRM are controlled predominately by pyrrhotite and magnetite, which were clearly identified by both scanning electron microscopy (SEM) and rock magnetic analyses. Our results show some relationships between these magnetic properties and the ratio of concentrations of the trace rare earth elements (La/Yb), which is sensitive to degree of fractional crystallization. More significantly, the Mg content in ilmenite is highly related to the fractional crystallization. These observations bring new insights into the complexities of the magnetic properties and the mineral composition ( e. g., ilmenite) during the dynamic processes of mafic granulite xenoliths formation. However, the exact relationship between the rock magnetism and the fractional crystallization process needs further studies. |
| WOS关键词 | LOWER CONTINENTAL-CRUST ; HEMATITE-ILMENITE SERIES ; UPPER-MANTLE XENOLITHS ; TRACE-ELEMENTS ; GRAIN-SIZE ; REMANENT MAGNETIZATION ; LAMELLAR MAGNETISM ; ROCK MAGNETISM ; CROSS-SECTION ; IVREA ZONE |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000257049700001 |
| 出版者 | AMER GEOPHYSICAL UNION |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/68812]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Liu, Qingsheng |
| 作者单位 | 1.China Univ Geosci, Dept Geophys, Wuhan 430074, Peoples R China 2.Chinese Acad Sci, Paleomagnetism & Geochronol Lab SKL LE, Inst Geol & Geophys, Beijing 100029, Peoples R China 3.China Univ Geosci, State Key Lab Geol Proc & Mineral Resources China, Wuhan 430074, Peoples R China 4.NW Univ Xian, State Key Lab Continental Dynam, Xian 710069, Peoples R China |
| 推荐引用方式 GB/T 7714 | Liu, Qingsheng,Liu, Qingsong,Liu, Yongsheng,et al. Magnetic study of mafic granulite xenoliths from the Hannuoba basalt, north China[J]. GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,2008,9. |
| APA | Liu, Qingsheng.,Liu, Qingsong.,Liu, Yongsheng.,Gao, Shan.,Yang, Tao.,...&Jin, Zhenmin.(2008).Magnetic study of mafic granulite xenoliths from the Hannuoba basalt, north China.GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,9. |
| MLA | Liu, Qingsheng,et al."Magnetic study of mafic granulite xenoliths from the Hannuoba basalt, north China".GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS 9(2008). |
入库方式： OAI收割
来源：地质与地球物理研究所
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