Long-term electromagnetic core-mantle coupling and the Earth's rotation acceleration in the Mesozoic Era

doi:10.1016/j.rgg.2012.03.010

NIGPAS OpenIR

	Long-term electromagnetic core-mantle coupling and the Earth's rotation acceleration in the Mesozoic Era
	Zhang, Weijia 2; Sun, Yuanlin 1; Kelley, Neil 3; Lei, Yang 4; Yu, Hangjie 2
	2012-05-01
发表期刊	RUSSIAN GEOLOGY AND GEOPHYSICS
ISSN	1068-7971
卷号	53 期号:5 页码:491-499
摘要	Growth lines in the mineralized tissues of living and fossil organisms often exhibit regular patterns that record daily, monthly, or annual cycles. Growth laminations in fossil corals and other marine invertebrates indicate long-term deceleration of the Earth's rotation, probably largely due to tidal friction, resulting in a decline in the number of days per year over the Earth's history. Fossils suggest the rate of decline has not been uniform, with the trend between the late Carboniferous and Cretaceous in particular departing from preceding and subsequent periods. However, insufficient data have obscured the nature and cause of the apparent halt in despinning within this time interval. Here we present new fossil geochronometer data that reveal a sustained acceleration in the Earth's rotation in the early Mesozoic Era, lasting about 90 million years and producing a decrease in the length of day (LOD) at an average rate of about 3 ms/cy. The coincidence of this acceleration with certain geophysical events including the final assembly of Pangaea and a change in the intensity and stability of the geomagnetic field strongly suggests that its cause is rooted in the deep interior of the Earth. A similar explanation has been proposed for observed decadal variations in the Earth's rotation. Our results suggest large-scale linkage of rotational variation, tectonics, and the geomagnetic field to core-mantle boundary (CMB) dynamics. Furthermore the newly identified acceleration in the Earth's rotation which began at the end of the Paleozoic, and the geophysical factors that are associated with it, can ultimately bear on the causal mechanisms behind the Permo-Triassic mass extinction. (C) 2012, V.S. Sobolev IGM, Siberian Branch of the RAS. Published by Elsevier B.V. All rights reserved.
关键词	growth pattern Earth's rotation D" layer Wilson cycle electromagnetic core-mantle coupling
DOI	10.1016/j.rgg.2012.03.010
语种	英语
关键词[WOS]	MAGNETIC-FIELD ; PALEONTOLOGICAL EVIDENCE ; GROWTH-PATTERNS ; LENGTH ; DYNAMICS ; SUPERCONTINENTS ; CONVECTION ; AVALANCHE ; BOUNDARY ; CLIMATE
资助项目	National Natural Science Foundation of China[40572004]
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000303110600007
项目资助者	National Natural Science Foundation of China
出版者	ELSEVIER SCIENCE BV
文献类型	期刊论文
条目标识符	http://ir.nigpas.ac.cn/handle/332004/18728
专题	中国科学院南京地质古生物研究所
通讯作者	Sun, Yuanlin
作者单位	1.Peking Univ, Key Lab Orogen Belts & Crustal Evolut, Beijing 100871, Peoples R China 2.Peking Univ, Dept Phys, Beijing 100871, Peoples R China 3.Univ Calif Davis, Dept Geol, Davis, CA 95616 USA 4.State Key Lab Palaeobiol & Stratig, Nanjing 210008, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Weijia,Sun, Yuanlin,Kelley, Neil,et al. Long-term electromagnetic core-mantle coupling and the Earth's rotation acceleration in the Mesozoic Era[J]. RUSSIAN GEOLOGY AND GEOPHYSICS,2012,53(5):491-499.
APA	Zhang, Weijia,Sun, Yuanlin,Kelley, Neil,Lei, Yang,&Yu, Hangjie.(2012).Long-term electromagnetic core-mantle coupling and the Earth's rotation acceleration in the Mesozoic Era.RUSSIAN GEOLOGY AND GEOPHYSICS,53(5),491-499.
MLA	Zhang, Weijia,et al."Long-term electromagnetic core-mantle coupling and the Earth's rotation acceleration in the Mesozoic Era".RUSSIAN GEOLOGY AND GEOPHYSICS 53.5(2012):491-499.