globalchange  > 科学计划与规划
DOI: 10.1002/2016GL069303
论文题名:
More stable yet bimodal geodynamo during the Cretaceous superchron?
作者: Lhuillier F.; Gilder S.A.; Wack M.; He K.; Petersen N.; Singer B.S.; Jicha B.R.; Schaen A.J.; Colon D.
刊名: Geophysical Research Letters
ISSN: 0094-9640
EISSN: 1944-9371
出版年: 2016
卷: 43, 期:12
起始页码: 6170
结束页码: 6177
语种: 英语
英文关键词: Cretaceous normal superchron ; Paleocene ; paleosecular variation
Scopus关键词: Earth sciences ; Geophysics ; Basaltic lava flow ; Cretaceous normal superchron ; Dipolar fields ; Field stability ; Magnetic field direction ; Paleocene ; Paleosecular variations ; Time-dependent variabilities ; Geomagnetism
英文摘要: We report palaeomagnetic and 40Ar/39Ar dating results from two sequences of basaltic lava flows deposited at the same locality in western China, yet separated in time by ~50 Myr: one set lies within the Cretaceous normal superchron at 112–115 Ma and a second at 59–70 Ma spanning the Cretaceous-Palaeogene boundary. We find that magnetic field directions during the superchron exhibit bimodal populations: one with inclinations representative of a dipolar field and another with shallow inclinations that could reflect a more complex, multipolar field. However, the time-dependent variability in field directions was 50% lower during the superchron than after, which implies greater field stability during the superchron. Our results suggest that episodes of less dipolar field behavior occurred within the Cretaceous superchron and raise the question whether a second, more multipolar, field state is more persistent than previously thought. ©2016. American Geophysical Union. All Rights Reserved.
URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84977103412&doi=10.1002%2f2016GL069303&partnerID=40&md5=8333508713ba6b3d8d9880167dd50b0d
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/10603
Appears in Collections:科学计划与规划
气候变化与战略

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作者单位: Department of Earth and Environmental Sciences, Ludwig-Maximilians-University, Munich, Germany

Recommended Citation:
Lhuillier F.,Gilder S.A.,Wack M.,et al. More stable yet bimodal geodynamo during the Cretaceous superchron?[J]. Geophysical Research Letters,2016-01-01,43(12).
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