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. 2021 Jan 1;7(1):eaba5967. doi: 10.1126/sciadv.aba5967

Fig. 6. The nebular magnetic field as recorded by meteorites.

Fig. 6

(A and B) Chondrules from LL chondrite Semarkona (10). (C and D) Bulk samples of CM chondrite Murchison (134). (E and F) Bulk samples of ungrouped achondrite NWA 7325 (124). (A, C, and E) Evolution of magnetic moment in electromagnetic units (emu) during AF or thermal demagnetization of NRM (gray and black symbols), ARM (A and C) (red symbols), and TRM (E) (red symbols). Grey symbols denote secondary NRM components and black symbols denote high-coercivity NRM components interpreted to be records of nebular field conditions. (B, D, and F) Equal-area stereonets showing the directions obtained from least-squares fits (circles) and associated maximum angular deviation values (ellipses; a measure of uncertainty) for the high-coercivity components in five chondrules (B), two bulk subsamples (D), and nine bulk subsamples (F). In (B), (D), and (F), open (closed) symbols and dashed (solid) lines denote upper (lower) hemisphere projections. In (B), individual chondrules are denoted by distinct colors, with three chondrules yielding two mutually oriented subsamples each. In (C) and (E), NRM is multiplied by 10 for visibility. ARMs were acquired with a 2900 G AC field and 1 G bias (A) and a 1000 G AC field and 1 G bias (B), while the TRM was acquired by heating to 800°C in a field of 0.3 G.