Absence of a long-lived lunar paleomagnetosphere

John A. Tarduno, Rory D. Cottrell, Kristin Lawrence, Richard K. Bono, Wentao Huang, Catherine L. Johnson, Eric G. Blackman, Aleksey V. Smirnov, Miki Nakajima, Clive R. Neal, Tinghong Zhou, Mauricio Ibanez-Mejia, Hirokuni Oda, Ben Crummins

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Determining the presence or absence of a past long-lived lunar magnetic field is crucial for understanding how the Moon’s interior and surface evolved. Here, we show that Apollo impact glass associated with a young 2 million–year–old crater records a strong Earth-like magnetization, providing evidence that impacts can impart intense signals to samples recovered from the Moon and other planetary bodies. Moreover, we show that silicate crystals bearing magnetic inclusions from Apollo samples formed at ∼3.9, 3.6, 3.3, and 3.2 billion years ago are capable of recording strong core dynamo–like fields but do not. Together, these data indicate that the Moon did not have a long-lived core dynamo. As a result, the Moon was not sheltered by a sustained paleomagnetosphere, and the lunar regolith should hold buried 3He, water, and other volatile resources acquired from solar winds and Earth’s magnetosphere over some 4 billion years.

Original languageEnglish (US)
Article numbereabi7647
JournalScience Advances
Volume7
Issue number32
DOIs
StatePublished - Aug 2021
Externally publishedYes

ASJC Scopus subject areas

  • General

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