{"_buckets": {"deposit": "4394329a-ba73-42b2-9189-d11ea7876572"}, "_deposit": {"id": "19980", "owners": [], "pid": {"revision_id": 0, "type": "depid", "value": "19980"}, "status": "published"}, "_oai": {"id": "oai:nagoya.repo.nii.ac.jp:00019980"}, "item_9_alternative_title_19": {"attribute_name": "\u305d\u306e\u4ed6\u306e\u8a00\u8a9e\u306e\u30bf\u30a4\u30c8\u30eb", "attribute_value_mlt": [{"subitem_alternative_title": "CHIME dating of zircon using JEOL JXA-8530F FE-EPMA at JAEA Toki Research Institute of Isotope Geology and Geochronology"}]}, "item_9_biblio_info_6": {"attribute_name": "\u66f8\u8a8c\u60c5\u5831", "attribute_value_mlt": [{"bibliographicIssueDates": {"bibliographicIssueDate": "2015-03", "bibliographicIssueDateType": "Issued"}, "bibliographicPageEnd": "131", "bibliographicPageStart": "126", "bibliographicVolumeNumber": "26", "bibliographic_titles": [{"bibliographic_title": "\u540d\u53e4\u5c4b\u5927\u5b66\u52a0\u901f\u5668\u8cea\u91cf\u5206\u6790\u8a08\u696d\u7e3e\u5831\u544a\u66f8"}]}]}, "item_9_description_4": {"attribute_name": "\u6284\u9332", "attribute_value_mlt": [{"subitem_description": "This paper outlines an optimized condition of the CHIME zircon and xenotime dating on the JEOL JXA-8530F FE-EPMA that is equipped with three R=100 mm and two R=140 mm wavelength-dispersive spectrometers. The R=100 mm spectrometer coupled with a large-sized PET crystal has the potential advantage of the count rate in the analysis of trace Pb. The disadvantage of the poor discrimination of U-Mz2 from Th-Mb was reduced by the correction. Effects of U-Mz1, Zr-Lg2.3, Pb-M4-02, Pb-AM5 and Pb-M5-03A on the background measurement were eliminated through selection of narrow interference-free windows. Reliability of the improved procedure was tested with zircon and xenotime in a sample of Tsubonosawa gneiss from Rikuzen-Takada, Iwate Prefecture. Zircon ages of 560-540 Ma and zoned xenotime ages of 460-440 Ma, 370-340 Ma and 230 Ma are compatible with isotopic ages and conventional CHIME ages. The improved CHIME dating on JXA-8530F FE-EPMA has shortened the measurement time to 1/3 of the conventional methods. 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