Magnetostratigraphy of borehole EY02-2 in the southern Yellow Sea and its paleoenvironmental significance

doi:10.1007/s11434-006-0855-4

	Magnetostratigraphy of borehole EY02-2 in the southern Yellow Sea and its paleoenvironmental significance
	Shulan, Ge ; Xuefa, Shi ; Rixiang, Zhu ; Yanguang, Liu ; Ping, Yin ; Lejun, Liu
刊名	CHINESE SCIENCE BULLETIN
	2006-04-01
卷号	51 期号:7 页码:855-865
关键词	central Yellow Sea mud rock magnetism and magnetostratigraphy borehole EY02-2 M/B polarity boundary magnetic susceptibility
ISSN号	1001-6538
DOI	10.1007/s11434-006-0855-4
文献子类	Article
英文摘要	Detailed rock magnetic and paleomagnetic studies have been undertaken on borehole EY02-2 (70m in length) in the southern Yellow Sea (SYS). The main Curie point revealed by magnetic susceptibility-temperature (k-T) curve is 580-600 degrees C indicating magnetite dominance. The hysteresis loop parameters show large variation of magnetic mineral size in different sedimentary contexts: it is larger in subtidal sediment than in terrigenous sediment and even larger than in shallow sea sediment. This trend is correlative with distance to sediment source and dynamic strength. Magnetostratigraphic results show that the M/B polarity boundary (MBPB) is at 63.29m and there are at least 7 polarity transitions (Nrl-7) in Brunhes chron that can be tentatively correlated with 6 named polarity reversals. Three positive polarity reversals occur in late Matuyama chron and the early two may be the record of Kamikatsura happening in 886 +/- 3 kaB.P. Magnetic susceptibility (MS) and sediment grain size behave so differently in some sedimentary facies that certain big environmental changes can be clearly revealed. Generally, the MS and grain size of subtidal and terrigenous sediments are larger than shallow sea sediments and MS value around 10x10(-5)Sl and mean grain size of 7 Phi seems to be indicators of shallow sea sediments of deep water depth. However, the frequently used excellent climatic proxies such as MS and grain size in loess and deep sea sediments fail to record such climatic cycles revealed by oxygen isotope in continental sea. The various sediment sources, sedimentation dynamic and their complex changes between glacial and interglacial periods should be the cause of failure.
WOS关键词	CHINESE LOESS PLATEAU ; MAGNETIC-SUSCEPTIBILITY ; SEDIMENTS ; CLIMATE ; PALEOINTENSITY ; ATLANTIC ; DEPOSITS ; SECTION ; RECORD ; CORE
WOS研究方向	Science & Technology - Other Topics
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000237493500014
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/67034]
专题	中国科学院地质与地球物理研究所
通讯作者	Xuefa, Shi
作者单位	1.State Ocean Adm, Key Lab Marine Sedimentat & Environm Geol, Inst Oceanog 1, Qingdao 266061, Peoples R China 2.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Shulan, Ge,Xuefa, Shi,Rixiang, Zhu,et al. Magnetostratigraphy of borehole EY02-2 in the southern Yellow Sea and its paleoenvironmental significance[J]. CHINESE SCIENCE BULLETIN,2006,51(7):855-865.
APA	Shulan, Ge,Xuefa, Shi,Rixiang, Zhu,Yanguang, Liu,Ping, Yin,&Lejun, Liu.(2006).Magnetostratigraphy of borehole EY02-2 in the southern Yellow Sea and its paleoenvironmental significance.CHINESE SCIENCE BULLETIN,51(7),855-865.
MLA	Shulan, Ge,et al."Magnetostratigraphy of borehole EY02-2 in the southern Yellow Sea and its paleoenvironmental significance".CHINESE SCIENCE BULLETIN 51.7(2006):855-865.