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Long-term electromagnetic core-mantle coupling and the Earth's rotation acceleration in the Mesozoic Era
Zhang, Weijia2; Sun, Yuanlin1; Kelley, Neil3; Lei, Yang4; Yu, Hangjie2
2012-05-01
发表期刊RUSSIAN GEOLOGY AND GEOPHYSICS
ISSN1068-7971
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
DOI10.1016/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
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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.
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