Magnetostratigraphy of a greigite-bearing core from the South Yellow Sea: Implications for remagnetization and sedimentation

doi:10.1002/2014JB011206

	Magnetostratigraphy of a greigite-bearing core from the South Yellow Sea: Implications for remagnetization and sedimentation
	Liu, Jianxing 1,2,3; Shi, Xuefa 1; Liu, Qingsong 2; Ge, Shulan 1; Liu, Yanguang 1; Yao, Zhengquan 1; Zhao, Quanhong 4; Jin, Chunsheng 2; Jiang, Zhaoxia 2,3; Liu, Shengfa 1
刊名	JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
	2014-10
卷号	119 期号:10 页码:7425-7441
关键词	South Yellow Sea continental shelf greigite rock magnetism magnetostratigraphy
ISSN号	2169-9313
DOI	10.1002/2014JB011206
英文摘要	Sediments from the continental shelf are sensitive to sea level, climatic changes, and local tectonic history. In this study, we carried out a high-resolution magnetostratigraphic investigation on the longest core (NHH01, 125.64m) recovered from the South Yellow Sea (SYS). An abnormal interval dominated by negative inclinations was discovered by applying alternating field demagnetization (AFD) on samples from a greigite-bearing layer (44.90-51.80m). In contrast, the inclinations of most greigite-bearing samples changed from negative to positive when heated to similar to 360 degrees C. This strongly indicates that this inclination anomaly revealed by the AFD alone is not a true negative subchron. After neglecting the effects of greigite-bearing layers, the straightforward correlation of the interpreted magnetostratigraphy defines the Matuyama-Brunhes boundary (781ka) and the Jaramillo top (990ka) at 68.64m and 101.54m, respectively. The linearly extrapolated basal age of the core is similar to 1.10Ma. In addition, several short-lived inclination anomalies can be tentatively assigned to magnetic excursions, which indicates that the sedimentation could be continuous even at the millennial time scale at depth intervals bracketing these fast geomagnetic events. Moreover, the excellent correspondence between clay content variations of the core and the marine oxygen isotope record indicates the potential of clay content as a paleoclimatic proxy in the studied region in the past similar to 1Ma. In brief, our study provides not only a robust age model in the SYS but also a methodological guide for paleomagnetic studies in continental shelf region.
资助项目	National Natural Science Foundation of China[41025013] ; National Natural Science Foundation of China[41374073]
WOS关键词	LATE DIAGENETIC GROWTH ; MARINE-SEDIMENTS ; ROCK MAGNETISM ; NORTH-ATLANTIC ; SELF-REVERSAL ; GRAIN-SIZE ; AUTHIGENIC GREIGITE ; SOUTHWESTERN TAIWAN ; BOHAI SEA ; CHINA
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	AMER GEOPHYSICAL UNION
WOS记录号	WOS:000345368500003
内容类型	期刊论文
源URL	[http://ir.fio.com.cn:8080/handle/2SI8HI0U/26586]
专题	自然资源部第一海洋研究所
通讯作者	Shi, Xuefa
作者单位	1.State Ocean Adm, Inst Oceanog 1, Key Lab Marine Sedimentol & Environm Geol, Qingdao, Peoples R China 2.Chinese Acad Sci, Inst Geol & Geophys, Paleomagnetism & Geochronol Lab, Beijing, Peoples R China 3.Univ Chinese Acad Sci, Beijing, Peoples R China 4.Tongji Univ, Sch Ocean & Earth Sci, Shanghai 200092, Peoples R China
推荐引用方式 GB/T 7714	Liu, Jianxing,Shi, Xuefa,Liu, Qingsong,et al. Magnetostratigraphy of a greigite-bearing core from the South Yellow Sea: Implications for remagnetization and sedimentation[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2014,119(10):7425-7441.
APA	Liu, Jianxing.,Shi, Xuefa.,Liu, Qingsong.,Ge, Shulan.,Liu, Yanguang.,...&Wang, Chunjuan.(2014).Magnetostratigraphy of a greigite-bearing core from the South Yellow Sea: Implications for remagnetization and sedimentation.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,119(10),7425-7441.
MLA	Liu, Jianxing,et al."Magnetostratigraphy of a greigite-bearing core from the South Yellow Sea: Implications for remagnetization and sedimentation".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 119.10(2014):7425-7441.