Results of FT and U-Pb ages for of Middle Miocene Juniko Tuff, southwestern coast of Tsugaru province, Aomori Prefecture.

Mid-Miocene Juniko Tuff was distributed along the southwestern coast of Tsugaru province, Amori Prefecture, Japan, and Akaishi Formation overlie by Juniko Tuff. Seven (JT01, JT02A, JT05, JT08, JT11, JD01 and JD02) and one samples (AT01) were collected from felsic rocks of Juniko Tuff and Akaishi Formation, respectively. JT11 of eight samples perfomed zircon FT/U-Pb double dating, and the other ones for zircon U-Pb dating. Results of FT and U-Pb ages for their felsic rocks were shown in Tables S1 and S2, respectively.Table S1. U–Pb isotopic analytical data for zircons from the Juniko Tuff and related rocks using LA-ICP-MS.* Degree of discordance (%); negative numbers and blanks show normal discordant and concordant within 2σ of the analytical error, respectively.**Common Pb corrections were calculated following Sakata (2018).***Disequilibrium and common Pb corrections were calculated following Sakata (2018).# Outliers were rejected using Isoplot R.Table S2. Result of absolute zircon fission-track ages obtained from felsic rocks of Juniko Tuff.Fission-track age calculation of zircon from sample JT11, calculated on the basis of uranium concentrations measured with a Thermo iCAP using the NIST SRM-610 glass standard.# Zircon grains yielding ages older than the magmatic ages in U–Pb dating.