Persistence and origin of the lunar core dynamo

Suavet C.; Weiss B.P.; Cassata W.S.Shuster D.L.Gattacceca J.Chan L.Garrick-Bethell I.Head J.W.Grove T.L.Fuller M.D.

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Persistence and origin of the lunar core dynamo

机译：Persistence and origin of the lunar core dynamo

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The lifetime of the ancient lunar core dynamo has implications for its power source and the mechanismoffield generation.Here,we report analyses of two 3.56-Gy-old mare basalts demonstrating that they were magnetized in a stable and surprisingly intense dynamo magnetic field of at least~13 μT. These data extend the known lifetime of the lunar dynamo by ~160 My and indicate that the field was likely continuously active until well after the final large basin-forming impact. This likely excludes impact-driven changes in rotation rate as the source of the dynamo at this time in lunar history. Rather, our results require a persistent power source like precession of the lunar mantle or a compositional convection dynamo.

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《Proceedings of the National Academy of Sciences of the United States of America》 |2013年第21期|8453-8458|共6页
作者
Suavet C.; Weiss B.P.; Cassata W.S.Shuster D.L.Gattacceca J.Chan L.Garrick-Bethell I.Head J.W.Grove T.L.Fuller M.D.;
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作者单位

Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, United States;

Chemical Sciences Division, Lawrence Livermore National Laboratory, Livermore, CA 94550, United States;

Department of Earth and Planetary Science, University of California, Berkeley, CA 94720, United StatesDepartment of Earth and Planetary Sciences, University of California, Santa Cruz, CA 95064, United StatesDepartment of Geological Sciences, Brown University, Providence, RI 02912, United StatesHawai'i Institute of Geophysics and Planetology, University of Hawaii at Manoa, Honolulu, HI 96822, United States;

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收录信息美国《科学引文索引》(SCI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
原文格式 PDF
正文语种英语
中图分类自然科学总论;
关键词
High-K mare basalts; Paleomagnetism;

Persistence and origin of the lunar core dynamo

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