R6: Plutonic rocks, volcanic rocks and subduction factory

[R6-05] Crystallization processes of quartz in a granitic pluton:Cathodoluminescence zonation pattern and TitaniQ thermometer

*Takashi Yuguchi¹, Yasuhiro Ogita², Takenori Kato³, Rintaro Yokota¹, Eiji Sasao², Tadao Nishiyama⁴ (1. Yamagata Uni. Sci., 2. JAEA, 3. Nagoya Uni., 4. Kumamoto Uni.)

Keywords:Quartz, Cathodoluminescence characterization, Oscillatory zonation, TitaniQ thermometer, Toki granite

The following analyses reveal the crystallization processes of quartz in a granitic pluton: 1) petrography of the crystal shape and occurrence, 2) characterization of the internal structure based on CL observations, and 3) Determination of crystallization temperature based on TitaniQ thermometry for the CL pattern-specific quartz grains. The case study for the Toki granite revealed that the magmatic quartz crystals are characterized by some patterns of internal structure in the CL observation, which are controlled by temperature and titanium diffusivity in the melt.