Sm-Nd mineral isochron age of sapphirine-quartz gneiss from the Mt. Riiser-Larsen area in the Napier Complex, East Antarctica
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- Suzuki Satoko
- Graduate School of Science and Technology, Niigata University
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- Kagami Hiroo
- Graduate School of Science and Technology, Niigata University
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- Ishizuka Hideo
- Department of Geology, Kochi University
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- Hokada Tomokazu
- National Institute of Polar Research
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Abstract
The Archaean Napier Complex in East Antarctica yields gneisses, including sapphirine+quartz assemblage that is diagnostic of ultra-high temperature (UHT) metamorphism. We determined an Sm-Nd mineral isochron age of the sapphirine-quartz gneiss from the Mt. Riiser-Larsen area for examining the timing of UHT metamorphism. The minerals analyzed here include sapphirine, orthopyroxene, sillimanite, quartz and feldspar, and the result defines approximately the mineral isochron of 2.2 Ga. This age is different from the ages of the other gneisses in the central part of the Mt. Riiser-Larsen area (approximately 2.4 Ga by Sm-Nd mineral isochron analyses). It is, therefore, suggested that the southwestern end of the Mt. Riiser-Larsen area, where the analyzed sapphirine-quartz gneiss was sampled, may have a different geological history from the gneisses of the central part, or may have been permeated with secondary fluid after the peak metamorphism.
Journal
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- Polar geoscience
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Polar geoscience 14 88-98, 2001-10
National Institute of Polar Research
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Details 詳細情報について
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- CRID
- 1571417126782954752
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- NII Article ID
- 110000035104
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- NII Book ID
- AA1130866X
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- ISSN
- 13443194
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- Text Lang
- en
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- Data Source
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- CiNii Articles