Paleomagnetism, of Carboniferous sediments in the Hexi corridor: its origin and tectonic implications

	Paleomagnetism, of Carboniferous sediments in the Hexi corridor: its origin and tectonic implications
	Huang, BC ; Otofuji, Y ; Zhu, RX ; Shi, RP ; Wang, YC
刊名	EARTH AND PLANETARY SCIENCE LETTERS
	2001-12-30
卷号	194 期号:1-2 页码:135-149
关键词	Ningxia China North China Platform Carboniferous paleomagnetism
ISSN号	0012-821X
文献子类	Article
英文摘要	We report palcomagnetic results for Carboniferous rocks from the eastern part of the Hexi Corridor, which we have demonstrated to be the western extension of the North China block (NCB). The characteristic high-temperature remanence component (B-component) exhibits predominantly reverse polarity, and is generally separable by thermal demagnetization temperature steps between 350 and 580degreesC. This B-component can also be isolated by alternating fields (AFs) cleaning at a peak value of 20 30 mT using a hybrid thermal-AF demagnetization method. The B-component shows a positive fold test at the 95% confidence level, indicating that it was acquired before Late Triassic to Early Jurassic folding. We interpret the B-component to be of primary origin acquired during the Carboniferous. The corresponding pole positions are at 14.0degreesE, 10.5degreesN, alpha(95) = 6.2degrees for the Early-Middle Carboniferous (late Viscan to Namurian) and at 10.2degreesE, 33.3degreesN, alpha(95) = 16.7degrees for the Late Carboniferous (Stephanian). The preliminary Late Carboniferous pole is in agreement with that for the NCB, supporting earlier claims that the Hexi Corridor has been the western extension of the NCB since the Ordovician. On the other hand, these two Carboniferous paleopoles are distinct from the coeval ones for Inner Mongolia, Outer Mongolia, South China, Tarim and stable Europe at greater than 95% confidence, suggesting that these continental blocks could not have been connected in their present configuration during Carboniferous time. The significant difference in paleolatitude between the NCB and Australian part of Gondwanaland according to the two new Hexi Corridor poles indicates that they had drifted apart by the late Visean. (C) 2001 Elsevier Science B.V. All rights reserved.
WOS关键词	POLAR WANDER PATH ; NORTH CHINA BLOCK ; YANGTZE BLOCK ; SOUTH CHINA ; TARIM BLOCK ; CONSTRAINTS ; COLLISION ; GONDWANA ; TERRANE ; POLES
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000173493300011
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/76775]
专题	中国科学院地质与地球物理研究所
通讯作者	Huang, BC
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100101, Peoples R China 2.Kobe Univ, Fac Sci, Dept Earth & Planetary Sci, Kobe, Hyogo 6578501, Japan
推荐引用方式 GB/T 7714	Huang, BC,Otofuji, Y,Zhu, RX,et al. Paleomagnetism, of Carboniferous sediments in the Hexi corridor: its origin and tectonic implications[J]. EARTH AND PLANETARY SCIENCE LETTERS,2001,194(1-2):135-149.
APA	Huang, BC,Otofuji, Y,Zhu, RX,Shi, RP,&Wang, YC.(2001).Paleomagnetism, of Carboniferous sediments in the Hexi corridor: its origin and tectonic implications.EARTH AND PLANETARY SCIENCE LETTERS,194(1-2),135-149.
MLA	Huang, BC,et al."Paleomagnetism, of Carboniferous sediments in the Hexi corridor: its origin and tectonic implications".EARTH AND PLANETARY SCIENCE LETTERS 194.1-2(2001):135-149.