DOI: 10.1038/ngeo2150
论文题名: Reorientation of the early lunar pole
作者: Takahashi F. ; Tsunakawa H. ; Shimizu H. ; Shibuya H. ; Matsushima M.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2014
卷: 7, 期: 6 起始页码: 409
结束页码: 412
语种: 英语
Scopus关键词: lunar crust
; magnetic anomaly
; magnetic field
; magnetization
; magnetometer
; paleomagnetism
英文摘要: Palaeomagnetic measurements suggest that an active core dynamo operated on the Moon from 4.2 to 3.56 billion years ago1-3. Since the Apollo era, many magnetic anomalies have been observed on the Moon. The magnetization of the lunar crust in some of these regions could preserve the signature of an early dipolar magnetic field generated by a core dynamo. Thus, the magnetic anomalies may yield information about the position of the palaeomagnetic pole during the time that the dynamo operated. Here we present a comprehensive survey of magnetic anomalies on the lunar surface using magnetometer data 4,5 obtained by the Lunar Prospector and Kaguya lunar orbiters. We extract magnetization vectors from 24 magnetic anomalies using an iterative inversion method and derive the palaeomagnetic poles. We find that the north poles, as well as the antipodal south poles, cluster in two distinct locations: one near the present rotation axis and the other at mid-latitude. The clustering is consistent with a dipole-dominated magnetic field generated in the lunar core by a dynamo that was reversing, much like that of Earth. Furthermore, the two pole clusters imply that the Moon experienced a polar wander event during its ancient history due to the reorientation of the Moon with respect to its spin axis by 45°-60°. © 2014 Macmillan Publishers Limited. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106523
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: Department of Earth and Planetary Sciences, Kyushu University, Fukuoka 812-8581, Japan; Department of Earth and Planetary Sciences, Tokyo Institute of Technology, Tokyo 152-8551, Japan; Earthquake Research Institute, University of Tokyo, Tokyo 113-0032, Japan; Department of Earth and Environmental Sciences, Kumamoto University, Kumamoto 860-8555, Japan
Recommended Citation:
Takahashi F.,Tsunakawa H.,Shimizu H.,et al. Reorientation of the early lunar pole[J]. Nature Geoscience,2014-01-01,7(6)