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Determination of the oxidation state of radiogenic Pb in natural zircon using X-ray absorption near-edge structure |
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| Authors: | Kazuya Tanaka Yoshio Takahashi Kenji Horie Hiroshi Shimizu Takashi Murakami |
| Institution: | (1) Department of Earth and Planetary Systems Sciences, Graduate School of Science, Hiroshima University, Higashi-Hiroshima Hiroshima, 739-8526, Japan;(2) Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology, AIST Tsukuba Central 7, Tsukuba 305-8567, Japan;(3) Department of Earth and Planetary Science, The University of Tokyo, 7-3-1 Hongo, Tokyo 113-0033, Japan;(4) Present address: Advanced Science Research Center, Japan Atomic Energy Agency, Tokai Ibaraki, 319-1195, Japan |
| Abstract: | We examined the LIII-edge Pb X-ray absorption near-edge structure (XANES) of three natural zircon samples with different amounts of radiation doses (1.9 × 1015 to 6.8 × 1015 α-decay events/mg). The results suggest that the oxidation state of radiogenic Pb in the zircon sample with the highest radiation dose is divalent. The XANES spectra of the two other samples with lower radiation doses suggest that radiogenic Pb(II) is present, and further that some Pb may be tetravalent. This is the first work on the determination of the oxidation state of radiogenic Pb in natural zircon using XANES. |
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