Short geomagnetic event recorded in chinese loess-soil sequences

CORC > 力学研究所 > 中国科学院力学研究所 > 力学所知识产出(1956-2008)

	Short geomagnetic event recorded in chinese loess-soil sequences
	Lin M(林缅)
	1999
会议名称	IUGG 99
会议日期	1999
会议地点	Birmingham, UK
页码	785
通讯作者	guobin@mail.c-geos.ac.cn
中文摘要	The nature of geomagnetic field behavior during polarity transitions is one of the most highly debated issues in modern geophysics. The detailed study of geomagnetic reversals and excursions has provided some insights on fluid motion in the Earth's core. Since the short geomagnetic event within the Jaramillo normal subchron had been discovered in the Wanganu Basin, New Zealand, the similar phenomena had also been uncovered in the Weinan and Jiuzhoutai, China. Its global nature and even their existence, however, are still deputed. Recently, the detailed rock magnetic and paleomagnetic investigations had been carried out in Chinese loess-paleosol sequences at Jinbian (37.4°N, 108.8°E), China. It has been shown that both loess and paleosol in the northern margin of the Chinese loess plateau can capture geomagnetic variation during the polarity transition, also that a reversal bounding the onset of a reversed-polarity zone within the Jaramillo normal subchron was recorded. Rock magnetic and paleomagnetic studies demonstrate that this short-term feature is geomagnetic signals, rather than artefacts. The relative paleointensity records determined also confirm that the weakest geomagnetic field intensity correspond to the short-term feature. Therefore, we conclude that this short-term feature is an independent geomagnetic event. The statistical analysis reveal that the VGP paths of the short geomagnetic event are predominantly situated in the longitudinal sector over the America continent and its antipodal longitudes, while the VGP paths of upper Jaramillo recorded in the same loess-paleosol sequence exhibits a tight cluster located at western Australia. It suggests that the transitional field is very complex, VGP paths for
合作状况	国内
会议录	Proceedings of the 1999 International Union of Geodesy and Geophysics (IUGG)
学科主题	交叉与边缘领域的力学
语种	英语
内容类型	会议论文
源URL	[http://dspace.imech.ac.cn/handle/311007/47045]
专题	力学研究所_力学所知识产出(1956-2008)
推荐引用方式 GB/T 7714	Lin M. Short geomagnetic event recorded in chinese loess-soil sequences[C]. 见:IUGG 99. Birmingham, UK. 1999.