Presentation Information
[R6P-05]Cathodoluminescence oscillatory zoning of anhedral K-feldspar from equigranular Toki granite
*Mai Nonaka1, Takashi Yuguchi1, Satoshi Suzuki1, Takumi Iuura1, Kazuo Nakashima1, Tadao Nishiyama2 (1. Yamagata Uni. Sci., 2. Kumamoto Uni.)
Keywords:
cathodoluminescence,K-feldspar,oscillatory zoning,Toki granite
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We focused on the anhedral K-feldspar of the equigranular Toki granite, we newly observed cathodoluminescence (CL) oscillatory zoning of the anhedral K-feldspar. The crystal cores displayed in the CL images reflect the nucleation parts of magmatic K-feldspar. The CL intensities are positively correlated with titanium and barium concentrations, indicating that the CL variations depend on two factors: 1) titanium concentration as a CL activator and 2) density of Al-O−-Al structural defects.
We focused on the anhedral K-feldspar of the equigranular Toki granite, we newly observed cathodoluminescence (CL) oscillatory zoning of the anhedral K-feldspar. The crystal cores displayed in the CL images reflect the nucleation parts of magmatic K-feldspar. The CL intensities are positively correlated with titanium and barium concentrations, indicating that the CL variations depend on two factors: 1) titanium concentration as a CL activator and 2) density of Al-O−-Al structural defects.