SHRIMP geochronology of a mylonite zone on Tonagh Island: characterisation of the last high-grade tectonothermal event in the Napier Complex, East Antarctica

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概要

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• 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.

• 国立極地研究所の論文

著者

• Osanai Yasuhito

  Department of earth sciences, Okayama university

• Hokada Tomokazu

  Department of Polar Science, School of Mathematical and Physical Sciences, The Graduate University f

• OWADA Masaaki

  Department of Earth Sciences, Yamaguchi University

• TSUNOGAE Toshiaki

  Institute of Geoscience, University of Tsukuba

• TOYOSHIMA Tsuyoshi

  Graduate school of Science and Technology, Niigata University

• Osanai Y

  Okayama Univ. Okayama Jpn

• Osanai Yasuhito

  Department Of Earth And Planetary System Science Okayama University

• Hokada Tomokazu

  Department Of Geology And Mineralogy Graduate School Of Science Kyoto University

• Hokada Tomokazu

  Department Of Geology National Science Museum

• Crowe Warwick

  Department Of Geology And Geophysics University Of Western Australia

• Tsunogae Toshiaki

  Institute Of Geoscience The University Of Tsukuba

• Owada Masaaki

  Department Of Earth Sciences University Of Yamaguchi

• Crowe Warwicka.

  Department Of Geology And Geophysics University Of Western Australia

• Crowe WarwickA.

  Tectonics Special Research Centre, Department of Geology and Geophysics, University of Western Austr

• Toyoshima Tsuyoshi

  Graduate School Of Science And Technology Niigata University

• Toyoshima Tsuyoshi

  Graduate School Of Science And Technology Earth Science Niigata University

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