2020 Volume 126 Issue 10 Pages 597-601
The Pankehoronai Unit occupies the lowest part of the Cretaceous Kamuikotan high-P metamorphic rocks in central Hokkaido, Northeast Japan, and consists mainly of pelitic and mafic schists. Detrital zircon grains from the pelitic schist of the Pankehoronai Unit along the Kamuidaiyonsengawa River, in the west of Asahikawa, have the youngest age cluster with the weighted mean of the 206Pb/238U ages of 81.45±0.99 Ma (95% confidence; Campanian). This result indicates that the pelitic protolith of the Pankehoronai Unit was deposited in the Campanian (latest Cretaceous) or later, which is the youngest record of the depositional age from the Kamuikotan metamorphic rocks.
