A nonmagnetic differentiated early planetary body

Benjamin P. Weiss , Huapei Wang , Thomas G. Sharp , Jérôme Gattacceca (1) , David L. Shuster , Brynna Downey , Jinping Hu , Roger R. Fu , Aaron T. Kuan , Clement Suavet , Anthony J. Irving , Jun Wang , Jiajun Wang

1 CEREGE - Centre européen de recherche et d'enseignement des géosciences de l'environnement

Paleomagnetic studies of meteorites have shown that the solar nebula was likely magnetized and that many early planetary bodies generated dynamo magnetic fields in their advecting metallic cores. The surface fields on these bodies were recorded by a diversity of chondrites and achondrites, ranging in intensity from several a to several hundred mu T. In fact, an achondrite parent body without evidence for paleomagnetic fields has yet to be confidently identified, hinting that early solar system field generation and the dynamo process in particular may have been common. Here we present paleomagnetic measurements of the ungrouped achondrite NWA 7325 indicating that it last cooled in a near-zero field (

Domaines: Sciences de la Terre

Benjamin P. Weiss, Huapei Wang, Thomas G. Sharp, Jérôme Gattacceca, David L. Shuster, et al.. A nonmagnetic differentiated early planetary body. Earth and Planetary Science Letters, 2017, 468, pp.119-132. ⟨10.1016/j.epsl.2017.03.026⟩. ⟨hal-01765573⟩