Is there a precursor to the Cretaceous normal superchron? New paleointensity and age determination from Liaoning province, northeastern China

doi:10.1016/j.pepi.2004.01.008

	Is there a precursor to the Cretaceous normal superchron? New paleointensity and age determination from Liaoning province, northeastern China
	Zhu, RX ; Lo, CH ; Shi, RP ; Pan, YX ; Shi, GH ; Shao, J
刊名	PHYSICS OF THE EARTH AND PLANETARY INTERIORS
	2004-11-15
卷号	147 期号:2-3 页码:117-126
关键词	paleointensity Ar-40/Ar-39 dating Cretaceous normal superchron andesitic basalt
ISSN号	0031-9201
DOI	10.1016/j.pepi.2004.01.008
文献子类	Article
英文摘要	Although the geomagnetic reversal record for the past 160 Myr is relatively well documented, whether a precursor exists before the onset of the Cretaceous normal superchron (CNS) remains a contentious topic in the study of the evolution of geomagnetic reversals. In the present study we have tried to find out if new paleointensity data can provide more information about this topic. A paleointensity, geochronologic and paleomagnetic investigation has been conducted on four andesitic basalt lava flows from Hulahada in Liaoning Province, northeastern China. Radiometric Ar-40/Ar-39 dating experiments indicate the volcanism occurred at about 122.7 +/- 0.6 Myr, corresponding to marine anomaly Mln. Thermomagnetic experiments and hysteresis loops show that the main magnetic carrier of remanence are titanomagnetites with Curie temperatures of similar to580degreesC. Thirty-eight samples from three lavas underwent Thellier-Thellier paleointensity experiments with systematic partial thermoremanent magnetization (pTRM) checks. Ten samples from the studied lavas yield reliable paleointensity estimates with a mean virtual dipole moment (VDM*) of (4.8 +/- 0.2) x 10(22) Am-2, about half the strength of the modern-day field. Our paleointensity results in conjunction with previous data suggest that there is no precursor to the CNS. (C) 2004 Elsevier B.V. All rights reserved.
WOS关键词	EARTHS MAGNETIC-FIELD ; GEOMAGNETIC-FIELD ; VOLCANIC-ROCKS ; INTENSITY ; HAWAII ; TIME ; INTERCALIBRATION ; PALEOMAGNETISM ; STANDARDS ; SEQUENCES
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000224726300004
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/79779]
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 Geol & Geophys, Beijing 100029, Peoples R China 2.Natl Taiwan Univ, Dept Geosci, Taipei 106, Taiwan 3.Peking Univ, Dept Geol, Beijing 100871, Peoples R China
推荐引用方式 GB/T 7714	Zhu, RX,Lo, CH,Shi, RP,et al. Is there a precursor to the Cretaceous normal superchron? New paleointensity and age determination from Liaoning province, northeastern China[J]. PHYSICS OF THE EARTH AND PLANETARY INTERIORS,2004,147(2-3):117-126.
APA	Zhu, RX,Lo, CH,Shi, RP,Pan, YX,Shi, GH,&Shao, J.(2004).Is there a precursor to the Cretaceous normal superchron? New paleointensity and age determination from Liaoning province, northeastern China.PHYSICS OF THE EARTH AND PLANETARY INTERIORS,147(2-3),117-126.
MLA	Zhu, RX,et al."Is there a precursor to the Cretaceous normal superchron? New paleointensity and age determination from Liaoning province, northeastern China".PHYSICS OF THE EARTH AND PLANETARY INTERIORS 147.2-3(2004):117-126.