Lunar Swirl Morphology Constrains the Geometry, Magnetization, and Origins of Lunar Magnetic Anomalies

Citation

Material Information

Title:
Lunar Swirl Morphology Constrains the Geometry, Magnetization, and Origins of Lunar Magnetic Anomalies
Series Title:
Journal of Geophysical Research: Planets
Creator:
Hemingway, Douglas J.
Tikoo, Sonia M.
Publication Date:
Language:
English

Subjects

Subjects / Keywords:
Lunar Magnetic Anomalies ( local )
Lunar Swirls ( local )
Magnetic Field Topology ( local )
Lava Tubes Magnetization ( local )
Dikes ( local )
Genre:
serial ( sobekcm )

Notes

Abstract:
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.
Original Version:
Journal of Geophysical Research: Planets, Vol. 123, no. 8 (2018-08-01).

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University of South Florida Library
Holding Location:
University of South Florida
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This object is protected by copyright, and is made available here for research and educational purposes. Permission to reuse, publish, or reproduce the object beyond the bounds of Fair Use or other exemptions to copyright law must be obtained from the copyright holder.

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