Granulites from Cape Hinode in the amphibolite-facies eastern part of Prince Olav Coast, East Antarctica: New evidence for allochthonous block in the Lutzow-Holm Complex
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- Hiroi Yoshikuni
- Department of Earth Sciences, Faculty of Science, Chiba University
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- Motoyoshi Yoichi
- National Institute of Polar Research
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- Satish-Kumar M.
- Institute of Geosciences, Shizuoka University
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- Kagashima Shin-ichi
- Department of Earth and Environmental Sciences, Faculty of Science, Yamagata University
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- Suda Yoshimitsu
- National Institute of Polar Research
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- Ishikawa Naoto
- School of Earth Sciences, HIS, Kyoto University
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Abstract
High-grade metamorphic rocks occurring along the Prince Harald, Soya, and Prince Olav Coasts make up the Latest Proterozoic-Early Paleozoic Lutzow-Holm Complex, which is the youngest orogenic belt in the East Antarctic Shield. A systematic increase in metamorphic grade from east to west, ranging from upper amphibolite facies on the eastern Prince Olav Coast to upper granulite facies at the head of Lutzow-Holm Bay, has been well-established in the complex. However, granulites are newly found to occur as blocks sitting within meta-tonalites at Cape Hinode located on the amphibolite-facies eastern Prince Olav Coast. In addition, it is newly revealed that kyanite occurs rather commonly in meta-tonalites which contain hornblende with or without clinopyroxene. The modes of occurrence in the field, petrographical features, and major element bulk rock compositions of the granulites and related rocks are given in some detail in this study. These, along with the previously presented geochronological, geochemical and petrographical data, would indicate that the rocks in the Cape Hinode area as a whole make up a Mesoproterozoic allochthonous block in the Latest Proterozoic-Early Paleozoic Lutzow-Holm Complex.
Journal
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- Polar geoscience
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Polar geoscience 19 89-108, 2006-10
National Institute of Polar Research
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Details 詳細情報について
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- CRID
- 1570009752094902912
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- NII Article ID
- 110004775317
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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