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Th, U AND Pb ANALYTICAL DATA AND CHIME DATING OF MONAZITES FROM METAMORPHIC ROCKS OF THE RAYNER, LUTZOW-HOLM, YAMATO-BELGICA AND SØR RONDANE COMPLEXES, EAST ANTARCTICA
https://doi.org/10.15094/00002850
https://doi.org/10.15094/00002850de2072da-fb51-4719-b118-fcb3f5f2b08b
名前 / ファイル | ライセンス | アクション |
---|---|---|
KJ00002368123 (1.8 MB)
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Item type | 紀要論文(ELS) / Departmental Bulletin Paper(1) | |||||
---|---|---|---|---|---|---|
公開日 | 1997-09-01 | |||||
タイトル | ||||||
タイトル | Th, U AND Pb ANALYTICAL DATA AND CHIME DATING OF MONAZITES FROM METAMORPHIC ROCKS OF THE RAYNER, LUTZOW-HOLM, YAMATO-BELGICA AND SØR RONDANE COMPLEXES, EAST ANTARCTICA | |||||
言語 | ||||||
言語 | eng | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | CHIME monazite age | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | granulite facies | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | Cambrian | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | East Antarctica | |||||
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 | 10.15094/00002850 | |||||
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) | |||||
著者名よみ |
アサミ, マサオ
× アサミ, マサオ× スズキ, カズヒロ× アダチ, マモル |
|||||
著者名(英) |
ASAMI, Masao
× ASAMI, Masao× SUZUKI, Kazuhiro× ADACHI, Mamoru |
|||||
著者所属(英) | ||||||
en | ||||||
Department of Earth Sciences, Faculty of Science, Okayama University | ||||||
著者所属(英) | ||||||
en | ||||||
Department of Earth and Planetary Sciences, Graduate School of Science, Nagoya University | ||||||
著者所属(英) | ||||||
en | ||||||
Department of Earth and Planetary Sciences, Graduate School of Science, Nagoya University | ||||||
抄録(英) | ||||||
内容記述タイプ | Other | |||||
内容記述 | This is a data-set paper, listing a total of 1091 electron microprobe ThO_2,UO_2 and PbO analyses and CHIME ages of monazites from 12 granulite-facies paragneiss samples from Mt. Vechernyaya (west-coastal Rayner Complex, 2 samples), Syowa Station (Lutzow-Holm Complex, 2 samples), the Yamato Mountains (Yamato-Belgica Complex, 2 samples) and the S∅r Rondane Mountains (Sør Rondane Complex, 6 samles), East Antarctica. Most monazite grains are chronologically unzoned. They occur in garnet as well as in other main constituent minerals and at grain-boundaries. The CHIME ages are within a narrow range : 533±9 Ma (MA88021504B) and 532±9 Ma (MA88021515-2) at Mt. Vechernyaya, 533±10 Ma (MA80020603B) and 537±9 Ma (MA80020702) at Syowa Station, 534±7 Ma (Y80A119) and 531±8 Ma (Y80A121d) in the Yamato Mountains, and 534±10 Ma (MA88011002-1), 529±14 Ma (MA88012216), 543±18 Ma (MA88020202-1), 542±6 Ma (84021904B), 539±16 Ma (84022004) and 541±15 Ma (85020401C) in the Sør Rondane Moutains. Distinct stepwise age zoning is observed in some grains from samples from the Yamato Mountains (Y80121d) and Sør Rondane Mountains (MA88020202-1,84021904B and 84022004). The zoned grains, like the unzoned ones, occur in garnet as well as in other main constituent minerals and at grain-boundaries. The rims of the zoned monazite grains give CHIME ages of 530-550 Ma, almost the same as those of unzoned grains, but the CHIME ages of the cores range from ca. 620 to ca. 750 Ma. The intergrain variation in the core age within a single sample suggests that the older cores are of detrital origin; the paragneiss protolith, at least in the Yamato-Belgica and Sør Rondane Complexes, is considered to have been deposited after the ~620 Ma thermal event in the provenance. This demonstrates that these paragneisses, if not all, are not of the polymetamorphosed late Proterozoic complexes as so far believed. The post~620 Ma sediments, along with the protolith in the west-coastal Rayner and Lutzow-Holm Complexes, are likely to have undergone high-grade metamorphism in the Cambrian (530-550 Ma). The Cambrian orogenic belt is more widespread in East Antarctica than has been thought. | |||||
雑誌書誌ID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AA1072335X | |||||
書誌情報 |
Proceedings of the NIPR Symposium on Antarctic Geosciences 巻 10, p. 130-152, 発行日 1997-09 |
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出版者 | ||||||
出版者 | National Institute of Polar Research |