Weak Magnetic Fields in the Outer Solar Nebula Recorded in CR Chondrites

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  • Roger R. Fu
    Department of Earth and Planetary Sciences Harvard University Cambridge MA USA
  • Pauli Kehayias
    Department of Earth and Planetary Sciences Harvard University Cambridge MA USA
  • Benjamin P. Weiss
    Department of Earth Atmospheric, and Planetary Sciences Massachusetts Institute of Technology Cambridge MA USA
  • Devin L. Schrader
    Center for Meteorite Studies, School of Earth and Space Exploration Arizona State University Tempe AZ USA
  • Xue‐Ning Bai
    Institute for Advanced Study Tsinghua University Beijing China
  • Jacob B. Simon
    Department of Physics and Astronomy Iowa State University of Science and Technology Ames IA USA

説明

<jats:title>Abstract</jats:title><jats:p>Theoretical investigations suggest that magnetic fields may have played an important role in driving rapid stellar accretion rates and efficient planet formation in protoplanetary disks. Experimental constraints on magnetic field strengths throughout the solar nebula can test the occurrence of magnetically driven disk accretion and the effect of magnetic fields on planetary accretion. Here we conduct paleomagnetic experiments on chondrule samples from primitive CR (Renazzo type) chondrites GRA 95229 and LAP 02342, which likely originated in the outer solar system between 3 and 7 AU approximately 3.7 million years after calcium aluminum‐rich inclusion formation. By extracting and analyzing 18 chondrule subsamples that contain primary, igneous ferromagnetic minerals, we show that CR chondrules carry internally non‐unidirectional magnetization that requires formation in a nebular magnetic field of ≤8.0 ± 4.3 μT (2<jats:italic>σ</jats:italic>). These weak magnetic fields may be due to the secular decay of nebular magnetic fields by 3.7 million years after calcium aluminum‐rich inclusions, spatial heterogeneities in the nebular magnetic field, or a combination of both effects. The possible inferred existence of spatial variations in the nebular magnetic field would be consistent with a prominent role for disk magnetism in the formation of density structures leading to gaps and planet formation.</jats:p>

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