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CHIME ages of xenotime, monazite and zircon from beryllium pegmatites in the Napier Complex, Khmara Bay, Enderby Land, East Antarctica
https://doi.org/10.15094/00003088
https://doi.org/10.15094/0000308871c24ee9-7a61-4833-8d39-a3755e1f48a5
名前 / ファイル | ライセンス | アクション |
---|---|---|
KJ00000044206 (1.9 MB)
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Item type | 紀要論文(ELS) / Departmental Bulletin Paper(1) | |||||
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公開日 | 2001-10-01 | |||||
タイトル | ||||||
タイトル | CHIME ages of xenotime, monazite and zircon from beryllium pegmatites in the Napier Complex, Khmara Bay, Enderby Land, East Antarctica | |||||
言語 | ||||||
言語 | eng | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | pegmatite | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | beryllium | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | Antarctica | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | Archean | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | CHIME dating | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | Napier Complex | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
資源タイプ | departmental bulletin paper | |||||
ID登録 | ||||||
ID登録 | 10.15094/00003088 | |||||
ID登録タイプ | JaLC | |||||
ページ属性 | ||||||
内容記述タイプ | Other | |||||
内容記述 | P(論文) | |||||
著者名(英) |
Grew, Edward S.
× Grew, Edward S.× Suzuki, Kazuhiro× Asami, Masao |
|||||
著者所属(英) | ||||||
en | ||||||
Department of Geological Sciences, University of Maine | ||||||
著者所属(英) | ||||||
en | ||||||
Nagoya University Center for Chronological Research | ||||||
著者所属(英) | ||||||
en | ||||||
Department of Earth Sciences, Faculty of Science, Okayama University | ||||||
抄録(英) | ||||||
内容記述タイプ | Other | |||||
内容記述 | Dating by the chemical Th-U-total Pb isochron method (CHIME) was carried out on xenotime, monazite and zircon from beryllium pegmatites intruded at about 2500 Ma in the ultrahigh-temperature metamorphic Napier Complex. No meaningful results were obtained on zircon from an associated Be-free pegmatite. All analyzed mineral grains are chronologically heterogeneous, and apparent ages range from -2460 Ma to 550 Ma with conspicuous concentration at 2200, 1700 and 700 Ma. The 2168±36 Ma age for the chronologically homogeneous, non-metamict core of a large xenotime grain dates intense post-emplacement deformation and metamorphism, possibly the granulite-facies event M-2 proposed by E.S. Grew et al. (Polar Geosci., 13, 1, 2000) to explain the breakdown of sapphirine and quartz to sillimanite, surinamite, orthopyroxene and/or garnet in the pegmatites and their host rocks. CHIME ages near ~1700 Ma and ~700 Ma could result from incomplete resetting by amphibolite-facies events (M-3, -4) between ~1100 and ~500 Ma. In general, the minerals appeared to have experienced no significant new growth during the later events, so that the effect of these events is expressed in the U-Th-Pb system in the original mineral. Because most of the ages were obtained on non-metamict portions of the analyzed grains, we doubt that metamictization can be the cause of most of the observed chronological heterogeneity. The lack of evidence for the ~2500 Ma emplacement age in the CHIME data could be due to the reliance on total concentrations of Th, U and Pb, which may be more affected by subsequent deformation and metamorphism than the isotope ratios measured in conventional U-Pb dating. | |||||
雑誌書誌ID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AA1130866X | |||||
書誌情報 |
Polar geoscience 巻 14, p. 99-118, 発行日 2001-10 |
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出版者 | ||||||
出版者 | National Institute of Polar Research |