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Analysis of an Updated Paleointensity Database (Q(PI)-PINT) for 65-200 Ma: Implications for the Long-Term History of Dipole Moment Through the Mesozoic

文献类型：期刊论文

作者Kulakov, E., V2; Sprain, C. J.3,4; Doubrovine, P., V2; Smirnov, A., V5,6; Paterson, G. A.3,7; Hawkins, L.3; Fairchild, L.8; Piispa, E. J.1; Biggin, A. J.3
刊名JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
出版日期2019-10-01
卷号124期号:10页码:9999-10022
ISSN号2169-9313
关键词geodynamo superchron geomagnetic field reversal dipole moment variation
DOI10.1029/2018JB017287
英文摘要The global paleointensity database for 65-200 Ma was analyzed using a modified suite of paleointensity quality criteria (Q(PI)) such that the likely reliability of measurements is assessed objectively and as consistently as possible across the diverse data set. This interval was chosen because of dramatic extremes of geomagnetic polarity reversal frequency ranging from greater than 10 reversals per million years in the Jurassic hyperactivity period (155-171 Ma) to effectively zero during the Cretaceous Normal Superchron (CNS; 84-126 Ma). Various attempts to establish a relationship between the strength of Earth's magnetic field and the reversal frequency have been made by previous studies, but no consensus has yet been reached primarily because of large uncertainties in paleointensity estimates and sensitivity of these estimates to data selection approaches. It is critical to overcome this problem because the evolution of the dipole moment is a first order constraint on the behavior of the geodynamo. Here we show that conventional statistical tests and Bayesian changepoint modeling consistently indicate the strongest median/average virtual dipole moment during the CNS. In addition, the CNS and Jurassic hyperactivity period are characterized by the highest and lowest percentage of virtual dipole moments exceeding the overall median for the 65- to 200-Ma interval, respectively. These observations suggest that the superchron dynamo was able to generate stronger fields than the dynamo operating in the frequently reversing regime. While the precise mechanism remains unclear, our results are compatible with the hypothesis that field strength and reversal rate variation are controlled by changes in core-mantle boundary thermochemical conditions.
WOS关键词EARTHS MAGNETIC-FIELD ; CRETACEOUS NORMAL SUPERCHRON ; SUBMARINE BASALTIC GLASS ; REVERSAL FREQUENCY ; GEOMAGNETIC-FIELD ; ABSOLUTE PALAEOINTENSITIES ; MANTLE CONVECTION ; STORMBERG LAVAS ; INTENSITY ; PALAEOMAGNETISM
资助项目Research Council of Norway[223272] ; Natural Environment Research Council (NERC)[NE/P017266/1] ; NSFC[41574063] ; Leverhulme Trust[RL-2016-080] ; NERC[NE/P00170X/1]
WOS研究方向Geochemistry & Geophysics
语种英语
出版者AMER GEOPHYSICAL UNION
WOS记录号WOS:000498770200002
资助机构Research Council of Norway ; Research Council of Norway ; Natural Environment Research Council (NERC) ; Natural Environment Research Council (NERC) ; NSFC ; NSFC ; Leverhulme Trust ; Leverhulme Trust ; NERC ; NERC ; Research Council of Norway ; Research Council of Norway ; Natural Environment Research Council (NERC) ; Natural Environment Research Council (NERC) ; NSFC ; NSFC ; Leverhulme Trust ; Leverhulme Trust ; NERC ; NERC ; Research Council of Norway ; Research Council of Norway ; Natural Environment Research Council (NERC) ; Natural Environment Research Council (NERC) ; NSFC ; NSFC ; Leverhulme Trust ; Leverhulme Trust ; NERC ; NERC ; Research Council of Norway ; Research Council of Norway ; Natural Environment Research Council (NERC) ; Natural Environment Research Council (NERC) ; NSFC ; NSFC ; Leverhulme Trust ; Leverhulme Trust ; NERC ; NERC
源URL[http://ir.iggcas.ac.cn/handle/132A11/95855]  
专题地质与地球物理研究所_中国科学院地球与行星物理重点实验室
通讯作者Kulakov, E., V
作者单位1.Yachay Tech Univ, Sch Geol Sci & Engn, Ibarra, Ecuador
2.Univ Oslo, Ctr Earth Evolut & Dynam, Oslo, Norway
3.Univ Liverpool, Dept Earth Ocean & Ecol Sci, Liverpool, Merseyside, England
4.Univ Florida, Dept Geol Sci, Gainesville, FL USA
5.Michigan Technol Univ, Dept Geol & Min Engn & Sci, Houghton, MI 49931 USA
6.Michigan Technol Univ, Dept Phys, Houghton, MI 49931 USA
7.Chinese Acad Sci, Key Lab Earth & Planetary Phys, Inst Geol & Geophys, Beijing, Peoples R China
8.Univ Calif Berkeley, Dept Earth & Planetary Sci, Berkeley, CA 94720 USA
推荐引用方式
GB/T 7714		 Kulakov, E., V,Sprain, C. J.,Doubrovine, P., V,et al. Analysis of an Updated Paleointensity Database (Q(PI)-PINT) for 65-200 Ma: Implications for the Long-Term History of Dipole Moment Through the Mesozoic[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2019,124(10):9999-10022.
APA Kulakov, E., V.,Sprain, C. J..,Doubrovine, P., V.,Smirnov, A., V.,Paterson, G. A..,...&Biggin, A. J..(2019).Analysis of an Updated Paleointensity Database (Q(PI)-PINT) for 65-200 Ma: Implications for the Long-Term History of Dipole Moment Through the Mesozoic.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,124(10),9999-10022.
MLA Kulakov, E., V,et al."Analysis of an Updated Paleointensity Database (Q(PI)-PINT) for 65-200 Ma: Implications for the Long-Term History of Dipole Moment Through the Mesozoic".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 124.10(2019):9999-10022.

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来源：地质与地球物理研究所

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