[SGL27-P04] Zircon U-Pb age and tectonics of shirakamidake granitic complex
Keywords:The Shirakamidake granitic complex , Zircon, U-Pb age
In this study, we describe geological and petrological features each bodies by polarizing microscopy, XRF spectrometry and EPMA analysis. We also present geochronological data utilizing laser ablation ICP mass spectrometry technique on the zircons that provides zircon U-pb age of 107.7±1.4Ma. Thermochronological data suggests two distinctive cooling stages for the Shirakamidake granitic complex; 1) a first rapid cooling stage in which the granitic magma was cooled to the temperature of host rock soon after intrusion, and 2) second slow cooling stage associated with the uplift and subsequent erosion of the granite intrusion after ∼ 90 Ma.