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Earth, Planets and Space
Fig. 6 | Earth, Planets and Space

Fig. 6

From: Middle Miocene forearc alkaline magmatism in Amami-Oshima Island, central Ryukyu Arc: implications for paleoreconstruction of Shikoku Basin

Fig. 6

a VGP of Dike1 and Dike2. b VGP distributions for paleosecular variation at the site. a An equal area projection of mean paleomagnetic directions. Note that VGPs projected onto the southern hemisphere are shown as open circles. A purple star indicates the location of Naon (129.31 °E, 28.33 °N). Light red and light blue arrows indicate VGP latitudes for Dike1 and Dike2 corrected for ~ 5 ° CW rotation, respectively. b VGPs for 10,000 paleomagnetic directions for the studied site by random sampling based on the secular variation model of TK03.GAD (Tauxe and Kent 2004) using python code tk03.py of pmagpy (https://earthref.org/MagIC/books/Tauxe/Essentials/). TK03.GAD model is based on PSVRL (paleosecular variation from lavas) database (see McElhinny and McFadden (1997)). Solid (open) circles are VGPs plotted onto the northern (southern) hemisphere. Using the simulated paleosecular variations, we estimated the probability of having the paleomagnetic directions for Dike1 and Dike2. The probability of having the paleomagnetic directions for dike1 within 17.6 ° angular distance (calculated from the paleomagnetic directions for the two dikes; see Fig. 5a) from dike2 by chance is 0.3%

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