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On the basis of geologic and petrologic studies, investigators have inferred a two-stage metamorphic history for the Sør Rondane : (1) an earlier regional granulite-facies event inferred from U-Pb zircon and Rb-Sr and Sm-Nd whole rock data to be \u0026acd;1000Ma in age, and (2) an amphibolite-facies overprint inferred to be \u0026acd;500Ma in age. PbO-ThO_2^* plots based on ThO_2,UO_2 and PbO contents of monazites yield a well-defined isochron for each gneiss, although both matrix grains in all gneiss samples and inclusions in garnet and pyrrhotite grains in a sample were analyzed. The isochrons give 536,534 and 534 Ma ages, indicating a single crystallization age (~535Ma) for the monazites. This age is in good agreement with the ~500Ma age currently assigned to the amphibolite-facies overprint. However, the high Pb retentivity reported for monazite, along with textural and mineralogical characteristics of the samples, constrains assignment of the monazite age to the granulite-facies metamorphism rather than to retrograde recrystallization. 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MONAZITE AGES BY THE CHEMICAL Th-U-TOTAL Pb ISOCHRON METHOD FOR PELITIC GNEISSES FROM THE EASTERN SØR RONDANE MOUNTAINS, EAST ANTARCTICA
https://doi.org/10.15094/00002823
https://doi.org/10.15094/000028233583ae85-90c0-406d-8a36-0888f69a1721
名前 / ファイル | ライセンス | アクション |
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KJ00002409870 (1.4 MB)
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Item type | 紀要論文(ELS) / Departmental Bulletin Paper(1) | |||||
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公開日 | 1996-09-01 | |||||
タイトル | ||||||
タイトル | MONAZITE AGES BY THE CHEMICAL Th-U-TOTAL Pb ISOCHRON METHOD FOR PELITIC GNEISSES FROM THE EASTERN SØR RONDANE MOUNTAINS, EAST ANTARCTICA | |||||
言語 | ||||||
言語 | eng | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | CHIME age | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | monazite | |||||
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 | granulite facies | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | Sør Rondane Mountains | |||||
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 | 10.15094/00002823 | |||||
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, School of Science, Nagoya University | ||||||
著者所属(英) | ||||||
en | ||||||
Department of Earth and Planetary Sciences, School of Science, Nagoya University | ||||||
抄録(英) | ||||||
内容記述タイプ | Other | |||||
内容記述 | Chemical Th-U-total Pb isochron (CHIME) ages were determined with an electron microprobe analyzer on 14 to 24 monazite grains in three garnet-biotite gneisses collected from separate outcrops in the eastern part of the Sør Rondane Mountains, East Antarctica. On the basis of geologic and petrologic studies, investigators have inferred a two-stage metamorphic history for the Sør Rondane : (1) an earlier regional granulite-facies event inferred from U-Pb zircon and Rb-Sr and Sm-Nd whole rock data to be ∿1000Ma in age, and (2) an amphibolite-facies overprint inferred to be ∿500Ma in age. PbO-ThO_2^* plots based on ThO_2,UO_2 and PbO contents of monazites yield a well-defined isochron for each gneiss, although both matrix grains in all gneiss samples and inclusions in garnet and pyrrhotite grains in a sample were analyzed. The isochrons give 536,534 and 534 Ma ages, indicating a single crystallization age (~535Ma) for the monazites. This age is in good agreement with the ~500Ma age currently assigned to the amphibolite-facies overprint. However, the high Pb retentivity reported for monazite, along with textural and mineralogical characteristics of the samples, constrains assignment of the monazite age to the granulite-facies metamorphism rather than to retrograde recrystallization. Our ~535Ma ages give rise to a possibility of further westward extension of a Cambrian orogenic belt recently reported from the Lützow-Holm and Yamato-Belgica Complexes, where a similar succession of metamorphic and plutonic activities has been recognized. | |||||
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 9, p. 49-64, 発行日 1996-09 |
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出版者 | ||||||
出版者 | National Institute of Polar Research |