Japan Geoscience Union Meeting 2015

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Symbol S (Solid Earth Sciences) » S-GL Geology

[S-GL39] Geochronology and Isotope Geology

Sun. May 24, 2015 9:00 AM - 10:45 AM A03 (APA HOTEL&RESORT TOKYO BAY MAKUHARI)

Convener:*Takahiro Tagami(Graduate School of Science, Kyoto University), Yuji Sano(Division of Ocean and Earth Systems, Atmosphere and Ocean Research Institute, University of Tokyo), Chair:Takahiro Tagami(Graduate School of Science, Kyoto University), Yuji Sano(Division of Ocean and Earth Systems, Atmosphere and Ocean Research Institute, University of Tokyo)

10:00 AM - 10:15 AM

[SGL39-05] Validation of X-ray interference correction methods in EPMA-CHIME dating

*Takenori KATO1, Deyng-lyong CHO2, Mi-Jung Jeen3 (1.Center for Chronological Research, Nagoya University, 2.Geological Mapping Department, Korea Institute of Geoscience and Mineral Resources, 3.Center for Resarch Facilities, Pusan National University)

Keywords:CHIME dating, X-ray interference correction, electron probe microanalysis (EPMA), quantitative analysis

The CHIME dating method provides micro-volume non-destructive U-Th-Pb dating based on quantitative electron probe microanalysis (EPMA). X-ray interference is a significant problem for the accuracy of the EPMA-CHIME dating. X-ray interferences are generally corrected using (1) peak-separation technique, (2) X-ray intensity based method[1], or (2) chemical composition based method[2]. X-ray interferences by Th and Y are validated using synthetic standard materials. X-ray intensity based correction highly depends on chosen standard materials in the determination of correction factors. On the contrary, the chemical composition based method is less sensitive to chosen standard materials.

[1]Åmli & Griffin, W.L. (1975) Amer. Mineral., 60, 599.
[2] Donovan, J.J., Snyder, D.A. & Rivers, M.L. (1993) Microbeam Anal., 2, 23.