Persistence and origin of the lunar core dynamo
The lifetime of the ancient lunar core dynamo has implications for its power source and the mechanism of field 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. T...
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| Veröffentlicht in: | Proceedings of the National Academy of Sciences - PNAS 2013-05, Vol.110 (21), p.8453-8458 |
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| container_title | Proceedings of the National Academy of Sciences - PNAS |
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| creator | Suavet, Clément Weiss, Benjamin P. Cassata, William S. Shuster, David L. Gattacceca, Jérôme Chan, Lindsey Garrick-Bethell, Ian Head, James W. Grove, Timothy L. Fuller, Michael D. |
| description | The lifetime of the ancient lunar core dynamo has implications for its power source and the mechanism of field 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. |
| doi_str_mv | 10.1073/pnas.1300341110 |
| format | Article |
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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.</description><subject>Basalt</subject><subject>Cosmochemistry. Extraterrestrial geology</subject><subject>Demagnetization</subject><subject>Earth</subject><subject>Earth sciences</subject><subject>Earth, ocean, space</subject><subject>Earths Moon</subject><subject>Exact sciences and technology</subject><subject>Extraterrestrial geology</subject><subject>Impact craters</subject><subject>Libration</subject><subject>Magnetic fields</subject><subject>Magnetization</subject><subject>Physical Sciences</subject><subject>Planetary science</subject><subject>Power</subject><subject>Rotating generators</subject><issn>0027-8424</issn><issn>1091-6490</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2013</creationdate><recordtype>article</recordtype><recordid>eNpd0c9rFDEUB_AgFrtWz57UgSL0Mt2XH5NkLoIUf0FBQXsOb_NjO8tssiYzQv_7zrDrrnpJDvnkfV_yCHlF4ZqC4stdxHJNOQAXlFJ4QhYUWlpL0cJTsgBgqtaCiXPyvJQNALSNhmfknHHZANdyQZbffS5dGXy0vsLoqpS7dRerFKrh3lf9GDFXNmVfuYeI2_SCnAXsi3952C_I3aePP2--1LffPn-9-XBbo6Qw1Bi043zFpqWVrXNaOUchMK-llxw8VSKoRrjgmWzRMu2ArqxCx5wNClt-Qd7v6-7G1dY76-OQsTe73G0xP5iEnfn3JHb3Zp1-Gy6lVHwucHUokNOv0ZfBbLtifd9j9GkshvJGqJZzKid6-R_dpDHH6XmzksAkaD6p5V7ZnErJPhyboWDmYZh5GOY0jOnGm7_fcPR_fn8C7w4Ai8U-ZIy2KyenuJrgHP324OaEY-yUy6jRopnF673YlCHlIxFMNlIJcaoQMBlc5ynl7gcDKgEo13P3j2FDrqM</recordid><startdate>20130521</startdate><enddate>20130521</enddate><creator>Suavet, Clément</creator><creator>Weiss, Benjamin P.</creator><creator>Cassata, William S.</creator><creator>Shuster, David L.</creator><creator>Gattacceca, Jérôme</creator><creator>Chan, Lindsey</creator><creator>Garrick-Bethell, Ian</creator><creator>Head, James W.</creator><creator>Grove, Timothy L.</creator><creator>Fuller, Michael D.</creator><general>National Academy of Sciences</general><general>National Acad Sciences</general><scope>FBQ</scope><scope>IQODW</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7QG</scope><scope>7QL</scope><scope>7QP</scope><scope>7QR</scope><scope>7SN</scope><scope>7SS</scope><scope>7T5</scope><scope>7TK</scope><scope>7TM</scope><scope>7TO</scope><scope>7U9</scope><scope>8FD</scope><scope>C1K</scope><scope>FR3</scope><scope>H94</scope><scope>M7N</scope><scope>P64</scope><scope>RC3</scope><scope>7X8</scope><scope>5PM</scope></search><sort><creationdate>20130521</creationdate><title>Persistence and origin of the lunar core dynamo</title><author>Suavet, Clément ; Weiss, Benjamin P. ; Cassata, William S. ; Shuster, David L. ; Gattacceca, Jérôme ; Chan, Lindsey ; Garrick-Bethell, Ian ; Head, James W. ; Grove, Timothy L. ; Fuller, Michael D.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a610t-af8d33b2d33969dd87dd10f2e86e630e174f754dfe269ac28d01bc7ad2dcf7a93</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2013</creationdate><topic>Basalt</topic><topic>Cosmochemistry. 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| subjects | Basalt Cosmochemistry. Extraterrestrial geology Demagnetization Earth Earth sciences Earth, ocean, space Earths Moon Exact sciences and technology Extraterrestrial geology Impact craters Libration Magnetic fields Magnetization Physical Sciences Planetary science Power Rotating generators |
| title | Persistence and origin of the lunar core dynamo |
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