MATUYAMA/BRUNHES (M/B) TRANSITION RECORDED IN CHINESE LOESS
文献类型：期刊论文
| 作者 | SUN, DH; SHAW, J; AN, ZS; ROLPH, T |
| 刊名 | JOURNAL OF GEOMAGNETISM AND GEOELECTRICITY
 |
| 出版日期 | 1993 |
| 卷号 | 45期号:4页码:319-330 |
| DOI | 10.5636/jgg.45.319 |
| 文献子类 | Article |
| 英文摘要 | Here we present a detailed record of the Matuyama/Brunhes (M/B) polarity transition recorded in a loess section at Xifeng (36-degrees-N, 108-degrees-E), in the central part of the Chinese loess plateau. The transition zone, which occurs in loess unit L8, has a thickness of 3.8 m and was sampled in full. At this point in the section the loess accumulation rate has been estimated at 10 cm/ka, and with the size of sub-sample used provides a potential time resolution of 240 years. Magnetite has been identified as the main magnetic mineral with a small contribution from maghaemite or cation deficient magnetite. The remanence of all samples was investigated using thermal demagnetisation from room temperature up to 650-degrees-C. The results indicate a duration of 32,000 years for the decay and recovery of the main dipole intensity, and 20,000 years for the period of major directional change. During the transition the field intensity falls to an average of 30% of its value before and after the transition, although there are strong variations about this weak value which accompany a sequence of 4 reversed/normal/reversed fluctuations of the local field vector. These fluctuations immediately preceed the final reversed-normal transition, after which the field intensity recovers to its pre-transition value. Calculated VGP paths of most stages are continuous and confined to preferred longitude bands which include America, the Atlantic Ocean or Africa. Field behaviour during the transition period suggests that non-dipolar terms are dominant while the dipole field is weak, with the dipole decay and recovery associated with the increased influence of low order zonal terms of the geomagnetic field. |
| 学科主题 | Geology |
| WOS关键词 | GEOMAGNETIC REVERSAL ; POLARITY TRANSITION ; SEDIMENTS ; EQUATORIAL |
| WOS研究方向 | Geosciences, Multidisciplinary |
| 语种 | 英语 |
| WOS记录号 | WOS:A1993LC76500005 |
| 出版者 | TERRA SCIENTIFIC PUBL CO |
| 源URL | [http://ir.ieecas.cn/handle/361006/11975]  |
| 专题 | 黄土与第四纪地质国家重点实验室（1985-2004） |
| 推荐引用方式 GB/T 7714 | SUN, DH,SHAW, J,AN, ZS,et al. MATUYAMA/BRUNHES (M/B) TRANSITION RECORDED IN CHINESE LOESS[J]. JOURNAL OF GEOMAGNETISM AND GEOELECTRICITY,1993,45(4):319-330. |
| APA | SUN, DH,SHAW, J,AN, ZS,&ROLPH, T.(1993).MATUYAMA/BRUNHES (M/B) TRANSITION RECORDED IN CHINESE LOESS.JOURNAL OF GEOMAGNETISM AND GEOELECTRICITY,45(4),319-330. |
| MLA | SUN, DH,et al."MATUYAMA/BRUNHES (M/B) TRANSITION RECORDED IN CHINESE LOESS".JOURNAL OF GEOMAGNETISM AND GEOELECTRICITY 45.4(1993):319-330. |
入库方式： OAI收割
来源：地球环境研究所
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