Microstructural records of multiple retrograde local H2O supplement in the pelitic gneiss, Lützow-Holm Complex at Akarui Point, East Antarctica
The alkali-feldspar and biotite in the sillimanite-biotite-garnet gneiss from East Antarctica preserves characteristic microstructural evidence of multi-stage H2O supplement during the retrograde metamorphism. The first microstructural evidence is the "zoned feldspar, " in which the mesope...
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ftkyotouniv:oai:repository.kulib.kyoto-u.ac.jp:2433/199566 2023-05-15T13:49:19+02:00 Microstructural records of multiple retrograde local H2O supplement in the pelitic gneiss, Lützow-Holm Complex at Akarui Point, East Antarctica Nakamura, Aya Kitamura, Masao Kawakami, Tetsuo 河上, 哲生 2014-04 application/pdf http://hdl.handle.net/2433/199566 eng eng Springer Vienna 10.1007/s00710-013-0300-8 0930-0708 http://hdl.handle.net/2433/199566 AA10688292 Mineralogy and Petrology 108 2 177 186 The final publication is available at Springer via http://dx.doi.org/10.1007/s00710-013-0300-8. This is not the published version. Please cite only the published version. この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。 Journal Article 2014 ftkyotouniv 2017-10-28T22:53:20Z The alkali-feldspar and biotite in the sillimanite-biotite-garnet gneiss from East Antarctica preserves characteristic microstructural evidence of multi-stage H2O supplement during the retrograde metamorphism. The first microstructural evidence is the "zoned feldspar, " in which the mesoperthitic zone, the anti-perthitic zone, and lamella-free plagioclase zone coexist within a single crystal. They are occasionally found next to biotite, and are always depleted in orthoclase (Or) component toward the biotite. The formation process of this microstructure could be explained by the diffusion that oversteps the solvus. The second microstructural evidence is the serrate boundary between alkali-feldspar and biotite. The projections of biotite are selectively developed next to Or lamellae of alkali-feldspar every 3–5 μm. These two microstructures would have formed as the biotite grew by consuming potash in alkali-feldspar when H2O-bearing fluid locally passed through the grain boundaries. The former microstructure was formed at 825–900 °C before lamella formation, and the latter microstructure was formed after the lamella formation. These microstructures are the indicators of fluid pathways formed under two different temperature conditions. The common coexistence of these microstructures implies that the fluid used similar pathways during the retrograde metamorphism. Article in Journal/Newspaper Antarc* Antarctica East Antarctica Kyoto University Research Information Repository (KURENAI) East Antarctica |
institution |
Open Polar |
collection |
Kyoto University Research Information Repository (KURENAI) |
op_collection_id |
ftkyotouniv |
language |
English |
description |
The alkali-feldspar and biotite in the sillimanite-biotite-garnet gneiss from East Antarctica preserves characteristic microstructural evidence of multi-stage H2O supplement during the retrograde metamorphism. The first microstructural evidence is the "zoned feldspar, " in which the mesoperthitic zone, the anti-perthitic zone, and lamella-free plagioclase zone coexist within a single crystal. They are occasionally found next to biotite, and are always depleted in orthoclase (Or) component toward the biotite. The formation process of this microstructure could be explained by the diffusion that oversteps the solvus. The second microstructural evidence is the serrate boundary between alkali-feldspar and biotite. The projections of biotite are selectively developed next to Or lamellae of alkali-feldspar every 3–5 μm. These two microstructures would have formed as the biotite grew by consuming potash in alkali-feldspar when H2O-bearing fluid locally passed through the grain boundaries. The former microstructure was formed at 825–900 °C before lamella formation, and the latter microstructure was formed after the lamella formation. These microstructures are the indicators of fluid pathways formed under two different temperature conditions. The common coexistence of these microstructures implies that the fluid used similar pathways during the retrograde metamorphism. |
author2 |
河上, 哲生 |
format |
Article in Journal/Newspaper |
author |
Nakamura, Aya Kitamura, Masao Kawakami, Tetsuo |
spellingShingle |
Nakamura, Aya Kitamura, Masao Kawakami, Tetsuo Microstructural records of multiple retrograde local H2O supplement in the pelitic gneiss, Lützow-Holm Complex at Akarui Point, East Antarctica |
author_facet |
Nakamura, Aya Kitamura, Masao Kawakami, Tetsuo |
author_sort |
Nakamura, Aya |
title |
Microstructural records of multiple retrograde local H2O supplement in the pelitic gneiss, Lützow-Holm Complex at Akarui Point, East Antarctica |
title_short |
Microstructural records of multiple retrograde local H2O supplement in the pelitic gneiss, Lützow-Holm Complex at Akarui Point, East Antarctica |
title_full |
Microstructural records of multiple retrograde local H2O supplement in the pelitic gneiss, Lützow-Holm Complex at Akarui Point, East Antarctica |
title_fullStr |
Microstructural records of multiple retrograde local H2O supplement in the pelitic gneiss, Lützow-Holm Complex at Akarui Point, East Antarctica |
title_full_unstemmed |
Microstructural records of multiple retrograde local H2O supplement in the pelitic gneiss, Lützow-Holm Complex at Akarui Point, East Antarctica |
title_sort |
microstructural records of multiple retrograde local h2o supplement in the pelitic gneiss, lützow-holm complex at akarui point, east antarctica |
publisher |
Springer Vienna |
publishDate |
2014 |
url |
http://hdl.handle.net/2433/199566 |
geographic |
East Antarctica |
geographic_facet |
East Antarctica |
genre |
Antarc* Antarctica East Antarctica |
genre_facet |
Antarc* Antarctica East Antarctica |
op_relation |
10.1007/s00710-013-0300-8 0930-0708 http://hdl.handle.net/2433/199566 AA10688292 Mineralogy and Petrology 108 2 177 186 |
op_rights |
The final publication is available at Springer via http://dx.doi.org/10.1007/s00710-013-0300-8. This is not the published version. Please cite only the published version. この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。 |
_version_ |
1766251165699276800 |