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Earth, Planets and Space
Fig. 3 | Earth, Planets and Space

Fig. 3

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. 3

Typical Zijderveld diagrams for sample 2 (a), sample 27 (b, c, and d) and sample 77 (e and f). Samples 2, 27, and 77 correspond to stratigraphic levels of −116 cm, −63 cm, and +57 cm relative to the Byk-E tephra layer, respectively. a PThD for specimen 2B up to 500 °C. Inset is a plot showing magnetization versus temperature. b PAFD for specimen 27A-1. c PThD for specimen 27B up to 300 °C (left) followed by PAFD (right). d PThD for specimen 27A-2 up to 175 °C (left), and subsequent PAFD following LTD at each step (right). e PAFD for specimen 77A-1. f PThD for specimen 77A-2 up to 175 °C (left), and subsequent PAFD following LTD at each step (right). Sample 27 (b, c, and d) and sample 77 (e and f) are considered to have reversed and normal polarity of primary remanent magnetizations, respectively. Stratigraphic distance of paleomagnetic samples from Byk-E are after correction of slope of the outcrop. For each specimen, stratigraphic distance from Byk-E (Additional file 6: Table S1a) is shown after correction of slope of the outcrop in the parentheses

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