DOI: 10.1029/2018JE005604
Scopus记录号: 2-s2.0-85052827267
论文题名: Lunar Swirl Morphology Constrains the Geometry, Magnetization, and Origins of Lunar Magnetic Anomalies
作者: Hemingway D.J. ; Tikoo S.M.
刊名: Journal of Geophysical Research: Planets
ISSN: 21699097
出版年: 2018
卷: 123, 期: 8 起始页码: 2223
结束页码: 2241
语种: 英语
英文关键词: dikes
; lava tubes
; lunar magnetic anomalies
; lunar swirls
; magnetic field topology
; magnetization
英文摘要: Lunar swirls are collections of finely structured bright and dark surface markings, alternating over length scales of typically 1–5 km. If swirls are the result of plasma interactions with crustal magnetic anomalies or electrostatic or magnetic sorting of fine materials, the magnetic field orientation must vary over similar length scales. This requires that the associated source bodies be both shallow and narrow in horizontal extent. The correspondingly restricted volume of the source bodies in turn implies strong rock magnetization. Here we show that if ∼300-nT surface fields are necessary to produce observable swirl markings, the required rock magnetization must be >0.5 A/m, even for very shallow sources and likely closer to ∼2 A/m or more. This strong source rock magnetization, together with the geometric constraints that favor magmatic structures such as dikes or lava tubes, requires a mechanism to enhance the magnetic carrying capacity of the rocks. We propose that heating associated with magmatic activity could thermochemically alter host rocks and impart them with magnetizations an order of magnitude stronger than is typical of lunar mare basalts. Our results both place constraints on the geometry and magnetization of the source bodies and provide clues about the possible origins of the Moon's crustal magnetic anomalies. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113311
Appears in Collections: 气候减缓与适应
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作者单位: Department of Earth and Planetary Science, University of California, Berkeley, Berkeley, CA, United States; Department of Earth and Planetary Sciences, State University of New Jersey, Rutgers, Piscataway, NJ, United States
Recommended Citation:
Hemingway D.J.,Tikoo S.M.. Lunar Swirl Morphology Constrains the Geometry, Magnetization, and Origins of Lunar Magnetic Anomalies[J]. Journal of Geophysical Research: Planets,2018-01-01,123(8)