Behavior of Greigite-Bearing Marine Sediments During AF and Thermal Demagnetization and Its Significance
文献类型：期刊论文
| 作者 | Duan, Zongqi4,5,6; Liu, Qingsong6,7; Qin, Huafeng1; Zhao, Xixi2,3; Gao, Xing4 |
| 刊名 | GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
 |
| 出版日期 | 2020-07-01 |
| 卷号 | 21期号:7页码:12 |
| DOI | 10.1029/2019GC008635 |
| 通讯作者 | Gao, Xing(gxing@igsnrr.ac.cn) |
| 英文摘要 | Gyro-remanent magnetization (GRM) is a frequently occurring yet unwanted remanence contamination for certain samples during alternating field (AF) demagnetization of the natural remanent magnetization. The origin and detailed properties of GRM have not yet been fully understood. In this study, systematic rock magnetic analyses were conducted on marine greigite-bearing samples of Hole U1433A drilled by the IODP Expedition 349 from the South China Sea. Results show that GRM is mostly acquired above similar to 55 mT AF demagnetization and can be effectively removed by heating to similar to 400 degrees C during thermal demagnetization but a secondary tail could remain until similar to 585 degrees C. In addition, no apparent GRM was observed during the AF demagnetization for the 400 degrees C thermally treated samples. These results strongly suggest that GRM is dominantly carried by single domain (SD) greigite but with minor contributions from SD magnetite. Thus, thermal treatment alone or the hybrid demagnetization (i.e., thermal demagnetization at similar to 400 degrees C first then systematical AF demagnetization) can efficiently avoid the GRM acquisition and be beneficial for relative paleointensity estimation for greigite-bearing samples. Besides, GRM carried by greigite has a low thermal stability. Our results also show AF demagnetization spectra of anhysteretic remanent magnetization (ARM) could be strongly distorted by GRM effects due to both have a preference of SD particles. Thus, the median destructive field of ARM is improper to be used as a coercivity proxy for greigite-bearing samples. Instead, the biplot analysis of AF demagnetization of natural remanent magnetization and ARM can be used to evaluate the relative content of greigite. |
| WOS关键词 | ROTATIONAL REMANENT MAGNETIZATION ; ALTERNATING-FIELD DEMAGNETIZATION ; DOMAIN GRAIN SIZES ; GYROREMANENT MAGNETIZATION ; GYROMAGNETIC REMANENCE ; ROCK MAGNETISM ; RELATIVE PALEOINTENSITY ; PARTICLES IMPLICATIONS ; FE3S4 FORMATION ; SEA |
| 资助项目 | National Key Research and Development Program of China[2016YFA0601903] ; Natural Science Foundation of China[41506075] ; Natural Science Foundation of China[41430962] ; Natural Science Foundation of China[41674069] ; Natural Science Foundation of China[91528302] ; Natural Science Foundation of China[91628301] ; U.S. National Science Foundation[EAR-1250444] ; Chinese Continental Shelf Deep Drilling Program[GZH201100202] ; China Postdoctoral Science Foundation[2014M561047] |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| 出版者 | AMER GEOPHYSICAL UNION |
| WOS记录号 | WOS:000557248500003 |
| 资助机构 | National Key Research and Development Program of China ; Natural Science Foundation of China ; U.S. National Science Foundation ; Chinese Continental Shelf Deep Drilling Program ; China Postdoctoral Science Foundation |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/158208]  |
| 专题 | 中国科学院地理科学与资源研究所 |
| 通讯作者 | Gao, Xing |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing, Peoples R China 2.Tongji Univ, State Key Lab Marine Geol, Shanghai, Peoples R China 3.Univ Calif Santa Cruz, Dept Earth & Planetary Sci, Santa Cruz, CA 95064 USA 4.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, State Key Lab Resources & Environm Informat Syst, Beijing, Peoples R China 5.Geog Soc China, Beijing, Peoples R China 6.Qingdao Natl Oceanog Lab Sci & Technol, Lab Marine Geol, Qingdao, Peoples R China 7.Southern Univ Sci & Technol, Dept Marine Sci & Engn, Shenzhen, Peoples R China |
| 推荐引用方式 GB/T 7714 | Duan, Zongqi,Liu, Qingsong,Qin, Huafeng,et al. Behavior of Greigite-Bearing Marine Sediments During AF and Thermal Demagnetization and Its Significance[J]. GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,2020,21(7):12. |
| APA | Duan, Zongqi,Liu, Qingsong,Qin, Huafeng,Zhao, Xixi,&Gao, Xing.(2020).Behavior of Greigite-Bearing Marine Sediments During AF and Thermal Demagnetization and Its Significance.GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,21(7),12. |
| MLA | Duan, Zongqi,et al."Behavior of Greigite-Bearing Marine Sediments During AF and Thermal Demagnetization and Its Significance".GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS 21.7(2020):12. |
入库方式： OAI收割
来源：地理科学与资源研究所
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