151660 20251017144625.0 doi 10.1029/2021JE006900 sideral 126564 ART-2021-126564 eng Nichols C.I.O. A Time-Resolved Paleomagnetic Record of Main Group Pallasites: Evidence for a Large-Cored, Thin-Mantled Parent Body 2021 Access copy available to the general public Unrestricted Several paleomagnetic studies have been conducted on five Main Group pallasites: Brenham, Marjalahti, Springwater, Imilac, and Esquel. These pallasites have distinct cooling histories, meaning that their paleomagnetic records may have been acquired at different times during the thermal evolution of their parent body. Here, we compile new and existing data to present the most complete time-resolved paleomagnetic record for a planetesimal, which includes a period of quiescence prior to core solidification as well as dynamo activity generated by compositional convection during core solidification. We present new paleomagnetic data for the Springwater pallasite, which constrains the timing of core solidification. Our results suggest that in order to generate the observed strong paleointensities (~65–95 µT), the pallasites must have been relatively close to the dynamo source. Our thermal and dynamo models predict that the Main Group pallasites originate from a planetesimal with a large core (>200 km) and a thin mantle (<70 km). info:eu-repo/grantAgreement/ES/MCINN/MAT2017-83468-R info:eu-repo/semantics/openAccess by https://creativecommons.org/licenses/by/4.0/deed.es 4.434 2021 GEOCHEMISTRY & GEOPHYSICS 19 / 87 = 0.218 2021 Q1 T1 6.6 2021 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Bryson J.F.J. Cottrell R.D. Fu R.R. Harrison R.J. Herrero Albillos J. Universidad de Zaragoza (orcid)0000-0002-0901-8341 Kronast F. Tarduno J.A. Weiss B.P. 5001 065 Universidad de Zaragoza Dpto. Ciencia Tecnol.Mater.Fl. Área Cienc.Mater. Ingen.Metal. 126, 7 (2021), 006900 [21 pp.] J. geophys. res. Planets. JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS 2169-9097 1234366 http://zaguan.unizar.es/record/151660/files/texto_completo.pdf Versión publicada 3253682 http://zaguan.unizar.es/record/151660/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:151660 articulos driver 2025-10-17-14:23:45 ARTICLE