Figure 2

(A) Weighted mean zircon ²³⁸U/²⁰⁶Pb ages for the Kurobegawa Granite (top), a mafic enclave from the Kurobegawa Granite (middle), and Takidani Granodiorite (bottom). Purple boxes are excluded analyses. Weighted mean ages are shown with 2σ uncertainty and include analytical errors and systematic errors, respectively. (B,C) Zircon ²³⁸U/²⁰⁶Pb age distributions (histograms, probability density plot (PDP), and kernel density estimation (KDE)) for detrital zircon from the Jijidani and Azusa river sand younger than 100 Ma (B) and 10 Ma (C). n = number of grains. Bandwidth for KDE is fixed at 0.25 Ma.