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Fig. 4 | Earth, Planets and Space

Fig. 4

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. 4

Paleomagnetic results plotted versus levels above or below the Byk-E tephra layer (corrected for the slope of the outcrop). a Volume magnetic susceptibility for average of A and B specimens (see Additional file 6: Table S1a), b magnetization intensity, c declination, and d inclination for A specimens used for PAFD experiments (see Additional file 6: Table S1a). Blue solid circles and blue open diamonds are NRM before demagnetization and after AFD at 30 mT, respectively. e Declination, and f inclination for samples used for PAFD experiments following thermal demagnetization. Pink triangles are the results of PCA linear fitting on PAFD results following PThD experiments up to 175 °C in vacuum. Orange inverted triangles and red squares are the results of PCA linear fitting on PAFD results following PThD experiments at 175 °C and 300 °C in air, respectively. Three tephra layers identified in this study are shown as horizontal lines. For the results of PCA, only samples yielding MAD less than 15° are shown. Gray shading for levels between −95 cm and −120 cm represents the interval with no reliable magnetization due to unavailability of thermal demagnetization followed by PAFD experiments

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