Magnetostratigraphic constraints on the gondwanan origin of North China: Cambrian/Ordovician boundary results

	Magnetostratigraphic constraints on the gondwanan origin of North China: Cambrian/Ordovician boundary results
	Yang, ZY ; Otofuji, Y ; Sun, ZM ; Huang, BC
刊名	GEOPHYSICAL JOURNAL INTERNATIONAL
	2002-10-01
卷号	151 期号:1 页码:1-10
关键词	Cambrian-Ordovician boundary Gondwana magnetostratigraphy North China block (NCB)
ISSN号	0956-540X
文献子类	Article
英文摘要	A significant gap in the middle Palaeozoic apparent polar wander (APW) path precludes polarity definition of the early Palaeozoic palaeopole for North China. This problem can in part be resolved by the intercontinental correlation of magnetic polarity patterns across small time intervals. A magnetostratigraphic study was carried out on upper Cambrian to lower Ordovician sediments near Zhaogezhuang (long. 118.5degreesE, lat. 39.7degreesN), North China. After stepwise thermal or thermal and alternating field demagnetizations, a characteristic magnetic component with normal and antipodal reversed directions was identified. These data, drawn from 49 samples, yield a north palaeopole at long. 294.6degreesE, lat. 32.9degreesN (dp = 3.0degrees, dm = 5.3degrees). A concordant magnetic polarity pattern around the Cambrian-Ordovician boundary and lowest Ordovician obtained from different continents favours a Southern Hemisphere origin ( 17) formation site. Using the Cambrian-Ordovician APW paths between North China and Gondwana, we suggest that the North China block (NCB) was part of Gondwana during the Cambro-lowest Ordovician, and started breaking away from Gondwana in the lower Ordovician. This finding is contrary to some palaeomagnetic models where the NCB was quite separate from Gondwana in the late Proterozoic, and was attached to the 'Pacific' side of Antarctica.
WOS关键词	PALEOMAGNETIC CONSTRAINTS ; POLAR WANDER ; REMAGNETIZATION ; LIMESTONES ; HISTORY ; SECTION ; BLOCKS
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	BLACKWELL PUBLISHING LTD
WOS记录号	WOS:000178347900001
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/77951]
专题	中国科学院地质与地球物理研究所
通讯作者	Yang, ZY
作者单位	1.Chinese Acad Geol Sci, Inst Geomech, Beijing 100081, Peoples R China 2.Kobe Univ, Dept Earth & Planetary Sci, Kobe, Hyogo 657, Japan 3.Chinese Acad Sci, Inst Geophys, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Yang, ZY,Otofuji, Y,Sun, ZM,et al. Magnetostratigraphic constraints on the gondwanan origin of North China: Cambrian/Ordovician boundary results[J]. GEOPHYSICAL JOURNAL INTERNATIONAL,2002,151(1):1-10.
APA	Yang, ZY,Otofuji, Y,Sun, ZM,&Huang, BC.(2002).Magnetostratigraphic constraints on the gondwanan origin of North China: Cambrian/Ordovician boundary results.GEOPHYSICAL JOURNAL INTERNATIONAL,151(1),1-10.
MLA	Yang, ZY,et al."Magnetostratigraphic constraints on the gondwanan origin of North China: Cambrian/Ordovician boundary results".GEOPHYSICAL JOURNAL INTERNATIONAL 151.1(2002):1-10.