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Fig. 13 | Earth, Planets and Space

Fig. 13

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. 13

Results of FORC PCA on a set of FORC diagrams during heating in air for sample 102-1Z-3 shown in Fig. 12. a Variance explained by principal components (solid circles) shown together with cumulative variance (blue columns). 97% of variance is explained with PC1 and PC2 and three end members are recognized. b FORC for each heating step is plotted on PC2 versus PC1 diagram together with end members EM1, EM2 and EM3. FORC diagrams are shown for c EM1, d EM2 and e EM3. Color scales for d and e are the same as c. Horizontal profiles on FORC diagrams along Bu = 0 are shown for f EM1, g EM2 and h EM3. EM1 represents the component before heating. During heating, it gradually moves to EM2 at 400 °C. After 400 °C it moves to EM3 around 450–500 °C then back to EM2 at 600 °C

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