Palaeomagnetism of Precambrian dyke swarms in the North China Shield: The similar to 1.8 Ga LIP event and crustal consolidation in late Palaeoproterozoic times

doi:10.1016/j.jseaes.2011.03.010

	Palaeomagnetism of Precambrian dyke swarms in the North China Shield: The similar to 1.8 Ga LIP event and crustal consolidation in late Palaeoproterozoic times
	Piper, John D. A.1; Zhang Jiasheng 2; Huang, Baochung 3; Roberts, Andrew P.1
刊名	JOURNAL OF ASIAN EARTH SCIENCES
	2011-06-25
卷号	41 期号:6 页码:504-524
关键词	China Palaeoproterozoic Dyke Swarms Palaeomagnetism 1.8 Ga Lip Event Palaeopangaea Supercontinent
ISSN号	1367-9120
DOI	10.1016/j.jseaes.2011.03.010
文献子类	Article
英文摘要	The North China Shield (NCS) is cut by a laterally-extensive dyke swarm emplaced at 1.78-1.76 Ga when an extensional regime succeeded regional metamorphism and completion of cratonisation by similar to 1.85 Ga. Palaeomagnetic study of these dykes and adjoining metamorphic country rocks identifies a dominant shallow axis comprising a contiguous population with NE to N declinations and rare opposite polarity. Dykes with NE shallow magnetic declination (A1, D/I = 36/-1 degrees) recognised from previous study and emplaced in granulite terranes in the north are displaced by more northerly declinations (A2, D/I = 8/2 degrees) in lower grade metamorphic terranes to the south. Contact tests indicate a primary cooling-related origin to these magnetisations although tests are in part ambiguous because magnetisations in the granulite basement are comparable. Petrologic and rock magnetic considerations imply that magnetisation of the dykes occurred during uplift from depths as deep as 20 km following the peak of metamorphism at similar to 1.85 Ga. A temporal migration A2 similar to A1 is implied by the higher crustal level and earlier acquisition of the former, and the deeper source and later acquisition of the latter. A third population of dyke magnetisations (A3, D/I = 18/43 degrees) is distributed towards steeper inclinations and close to the Mesozoic-Recent palaeofield. These are either partial or complete overprints of A1-A2 magnetisations with greater degrees of alteration indicated by demagnetisation and thermomagenetic spectra, or are much younger dykes of Mesozoic-Tertiary age. A minority fourth (later Precambrian but presently undated) dual polarity population has a magnetisation (11 dykes, D/I = 108/7 degrees) with contact tests indicating a primary cooling-related origin.
WOS关键词	PALEOPROTEROZOIC TECTONIC EVOLUTION ; PB ZIRCON GEOCHRONOLOGY ; LARGE IGNEOUS PROVINCES ; SOUTH INDIAN BLOCK ; EASTERN BLOCK ; GEOLOGICAL SIGNIFICANCE ; POLAR WANDER ; SIBERIAN CONNECTION ; GRANULITE TERRAIN ; SHANDONG PROVINCE
WOS研究方向	Geology
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000291773000003
资助机构	Department of Science and Technology(2008DFA20700) ; Department of Science and Technology(2008DFA20700) ; National Science Foundation of China(40472114) ; National Science Foundation of China(40472114) ; Royal Society of London ; Royal Society of London ; Department of Science and Technology(2008DFA20700) ; Department of Science and Technology(2008DFA20700) ; National Science Foundation of China(40472114) ; National Science Foundation of China(40472114) ; Royal Society of London ; Royal Society of London ; Department of Science and Technology(2008DFA20700) ; Department of Science and Technology(2008DFA20700) ; National Science Foundation of China(40472114) ; National Science Foundation of China(40472114) ; Royal Society of London ; Royal Society of London ; Department of Science and Technology(2008DFA20700) ; Department of Science and Technology(2008DFA20700) ; National Science Foundation of China(40472114) ; National Science Foundation of China(40472114) ; Royal Society of London ; Royal Society of London
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/73626]
专题	中国科学院地质与地球物理研究所
通讯作者	Piper, John D. A.
作者单位	1.Univ Liverpool, Dept Earth & Ocean Sci, Geomagnetism Lab, Liverpool L69 7ZE, Merseyside, England 2.State Seismol Bur, Inst Geol, Beijing 100029, Peoples R China 3.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithosphere Evolut, Palaeomagnetism & Geochronol Lab, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Piper, John D. A.,Zhang Jiasheng,Huang, Baochung,et al. Palaeomagnetism of Precambrian dyke swarms in the North China Shield: The similar to 1.8 Ga LIP event and crustal consolidation in late Palaeoproterozoic times[J]. JOURNAL OF ASIAN EARTH SCIENCES,2011,41(6):504-524.
APA	Piper, John D. A.,Zhang Jiasheng,Huang, Baochung,&Roberts, Andrew P..(2011).Palaeomagnetism of Precambrian dyke swarms in the North China Shield: The similar to 1.8 Ga LIP event and crustal consolidation in late Palaeoproterozoic times.JOURNAL OF ASIAN EARTH SCIENCES,41(6),504-524.
MLA	Piper, John D. A.,et al."Palaeomagnetism of Precambrian dyke swarms in the North China Shield: The similar to 1.8 Ga LIP event and crustal consolidation in late Palaeoproterozoic times".JOURNAL OF ASIAN EARTH SCIENCES 41.6(2011):504-524.