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Earth, Planets and Space
Fig. 10 | Earth, Planets and Space

Fig. 10

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. 10

Coercivity spectrums of ARM monitored during heating of sample 102-1Z-1-B. a The first ARM is acquired before each heating step, which is AF demagnetized and the magnetization is plotted with color for the corresponding temperature and field steps. b Coercivity spectrum of magnetization after each heating step is obtained by dividing the magnetization difference of successive AFD steps by the AFD step difference in a. c The second ARM is acquired and PAFD demagnetized up to 80 mT after removal of the first ARM by AFD up to 80 mT following each heating step, which is useful in identifying thermal alteration. d Coercivity spectrum of magnetization in c. ARM acquisition was conducted with DC field of 50 μT and AC field of 80 mT

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