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SHRIMP geochronology of a mylonite zone on Tonagh Island: characterisation of the last high-grade tectonothermal event in the Napier Complex, East Antarctica
https://doi.org/10.15094/00003106
https://doi.org/10.15094/00003106bb881bd7-cda3-4a38-9546-25557c5e9862
名前 / ファイル | ライセンス | アクション |
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KJ00000044224 (2.7 MB)
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Item type | 紀要論文(ELS) / Departmental Bulletin Paper(1) | |||||
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公開日 | 2002-10-01 | |||||
タイトル | ||||||
タイトル | SHRIMP geochronology of a mylonite zone on Tonagh Island: characterisation of the last high-grade tectonothermal event in the Napier Complex, East Antarctica | |||||
言語 | ||||||
言語 | eng | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | Napier Complex | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | Tonagh Island | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | SHRIMP geochronology | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | mylonite | |||||
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 | 10.15094/00003106 | |||||
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) |
Crowe,WarwickA.
× Crowe,WarwickA.× Osanai,Yasuhito× Toyoshima,Tsuyoshi× Owada,Masaaki× Tsunogae,Toshiaki× Hokada ,Tomokazu |
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著者所属(英) | ||||||
en | ||||||
Tectonics Special Research Centre, Department of Geology and Geophysics, University of Western Australia/Department of Earth Sciences, Okayama University/Graduate School of Science and Technology, Niigata University/Department of Earth Sciences, Yamaguchi University/Institute of Geoscience, the University of Tsukuba/Department of Geology, National Science Museum | ||||||
抄録(英) | ||||||
内容記述タイプ | Other | |||||
内容記述 | Tonagh Island within the highest-grade zone of the Napier Complex, East Antarctica, consists of a strongly layered sequence of quartzofeldspathic gneiss, mafic granulite and ultramafic gneiss subdivided into five lithostratigraphic units by major NE-SW to E-W trending steeply-dipping D_6 shear zones. D_6 shear zones cut the principal foliation defined by D_1 and D_2 structures associated with the ultrahigh-temperature metamorphism. Zircons from two mylonite samples with moderate NE pitching mineral lineations within a D_6 shear zone and a D_6 mylonite and ultramylonite sample from within high strain zones that have an overprinting sub-horizontal mineral lineation were analyzed. All samples have anhydrous mineral assemblages with a late textural association of biotite, which formed pre- to syn- a secondary overprinting high temperature mylonitic fabric. Zircons in all samples contain a structureless zone that constitutes most of the grain area and commonly have a relict discordant, oscillatory-zoned core. The core may be obscured to the extent where only a structureless or an indistinct remnant remains These internal patterns are consistent with recrystallisation and annealing processes resulting in resetting of the U-Pb system during mylonitsation involving possibly three events between ca. 2550 Ma and ca. 2470 Ma. The timing of D_6 mylonitisation between ca. 2470-2550 Ma on Tonagh Island requires an earlier timing for UHT metamorphism. This is consistent with regional models that attribute UHT metamorphism to pre- ca. 2550 Ma tectonothermal events in the Napier Complex. | |||||
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 15, p. 17-36, 発行日 2002-10 |
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出版者 | ||||||
出版者 | National Institute of Polar Research |