Sedimentary record of two geomagnetic excursions within the last 15,000 years in Beijing, China

	Sedimentary record of two geomagnetic excursions within the last 15,000 years in Beijing, China
	Zhu, RX ; Coe, RS ; Zhao, XX
刊名	JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
	1998-12-10
卷号	103 期号:B12 页码:30323-30333
ISSN号	2169-9313
文献子类	Article
英文摘要	A fresh-water sedimentary sequence from Haidian in the Beijing basin has been sampled in three parallel trenches up to 300 m apart for paleomagnetic study. Age control is provided by nine radiocarbon dates, indicating an average accumulation rate of 45 cm/ka. A total of 683 specimens were measured for paleomagnetic directions. Two short excursions of field direction are recorded at closely comparable depths in all three cores, occurring between 5,060 and 4,860 +/- 90a B.P. and 14,230 and 13,690 +/- 130 a B.P. interpolated ages. The paleomagnetic records for the individual trenches were adjusted to a common depth scale using stratigraphic markers and then merged. The record correlates quite well with a paleomagnetic record in Beijing-basin sediments 55 km to the southwest (Changgou section), with regard to both the large excursions and also some of the smaller variations in direction. The excursions appear to reflect real geomagnetic phenomena, not artifacts of recording, but the spatial extent (regional or global) of the anomalous geomagnetic signals is not known.
WOS关键词	EARTHS MAGNETIC-FIELD ; SECULAR VARIATION ; PALEOMAGNETIC RECORD ; LAKE-SEDIMENTS ; PYRAMID LAKE ; ANISOTROPY ; CALIFORNIA ; INTENSITY ; NEVADA ; TIMES
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	AMER GEOPHYSICAL UNION
WOS记录号	WOS:000077966900034
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/75212]
专题	中国科学院地质与地球物理研究所
通讯作者	Zhu, RX
作者单位	1.Chinese Acad Sci, Inst Geophys, Beijing 100101, Peoples R China 2.Univ Calif Santa Cruz, Dept Earth Sci, Santa Cruz, CA 95064 USA
推荐引用方式 GB/T 7714	Zhu, RX,Coe, RS,Zhao, XX. Sedimentary record of two geomagnetic excursions within the last 15,000 years in Beijing, China[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,1998,103(B12):30323-30333.
APA	Zhu, RX,Coe, RS,&Zhao, XX.(1998).Sedimentary record of two geomagnetic excursions within the last 15,000 years in Beijing, China.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,103(B12),30323-30333.
MLA	Zhu, RX,et al."Sedimentary record of two geomagnetic excursions within the last 15,000 years in Beijing, China".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 103.B12(1998):30323-30333.