R6: Plutonic rocks, volcanic rocks and subduction factory

[R6P-02] Zircon growth process in granitic pluton by 3D cathodoluminescence patterns, U–Pb ages, titanium concentration, and Th/U ratios: Case study of the Okueyama granite, Kyushu, Japan

*Takashi Yuguchi¹, Daichi Itoh¹, Tatsunori Yokoyama², Shuhei Sakata³, Satoshi Suzuki¹, Yasuhiro Ogita², Koshi Yagi⁴, Takumi Imura¹, Satoko Motai¹, Takeshi Ohno⁵ (1. Yamagata Univ. , 2. JAEA, 3. Univ. Tokyo, 4. Hiruzen Institute, 5. Gakushuin Univ.)

Keywords:3D CL pattern, Zircon U–Pb dating, Titanium concentration, Th/U ratio, Okueyama granite

This study proposes a new method for elucidating zircon growth processes in the Okueyama granitic pluton, Kyushu, Japan. Our method, which combines 3D growth patterns, U–Pb ages, titanium concentration, and Th/U ratios, contributes to the petrology and mineralogy to understand the growth of zircon crystals within a magma chamber. The simultaneous determination of zircon U–Pb ages and Ti concentrations in the granite also enable us to associate Th/U ratio with the crystallization temperature.