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Earth, Planets and Space
Fig. 2 | Earth, Planets and Space

Fig. 2

From: Matuyama–Brunhes geomagnetic reversal record and associated key tephra layers in Boso Peninsula: extraction of primary magnetization of geomagnetic fields from mixed magnetic minerals of depositional, diagenesis, and weathering processes

Fig. 2

SEM analyses on framboidal sulfides. a Back scatter electron image taken for a thin section from Sample 83A. Framboidal sulfide minerals are densely filling the chambers of foraminiferal shell. b Close up of the area in a shown by a red rectangle. Framboidal sulfide minerals were composed by coarse (~ 1 micro-m) and fine (~ 0.3 micro-m) grain-size. c and d are spectrum of point A (coarse grain) and B (fine grain) with characteristic peaks of Fe and S, respectively

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