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Earth, Planets and Space
Fig. 15 | Earth, Planets and Space

Fig. 15

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. 15

Summary of paleomagnetic results and rock magnetic results plotted versus age compared with those by Haneda et al. (2020). From top to bottom, a Sratio (S−0.1 T and S−0.3 T shown by solid circles and solid triangles, respectively), b kARM/kLF, c kLF (solid circles) and kARM (solid triangles), d relative paleointensity (NRM30–50/ARM30–50), and e VGP latitude. Details on measurements and calculations of relative paleointensity is explained in the text. Black symbols indicate the results for the 1st sampling and the blue ones those for the 2nd sampling (Block G in Additional file 3: Figure S3(c) and Additional file 4: Figure S4(e)). Large and small symbols (black and blue circles) correspond to the highest (3) and second highest (2) reliabilities (Additional file 7: Table S2), respectively. Purple open circles are paleomagnetic results from Haneda et al. (2020) and small symbols are paleomagnetic data with MAD > 15°. Vertical dashed line is the M–B boundary. Vertical pink lines are tephra layers, which correspond to tephra A, Byk-E tephra, and tephra C from younger to older ages, respectively. Age model for this study is primarily based on the age of Byk-E tephra (774.1 ka; Suganuma et al. 2018) as a fixed point and correlation of relative paleointensity variations with those from Haneda et al. (2020). The best correlation is obtained by assuming sedimentation rates of 30 cm/kyr and 18 cm/kyr for the intervals above and below Byk-E tephra layer, respectively

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