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U-Pb zircon dating of the Sanbagawa metamorphic rocks in the Besshi-Asemi-gawa region, central Shikoku, Japan, and tectono-stratigraphic consequences
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- Aoki Kazumasa
- Department of Applied Science, Okayama University of Science
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- Seo Yoshiki
- Department of Applied Science, Okayama University of Science
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- Sakata Shuhei
- Department of Chemistry, Gakushuin University
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- Obayashi Hideyuki
- Department of Geology and Mineralogy, Kyoto University
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- Tsuchiya Yuta
- Department of Biosphere-Geosphere Science, Okayama University of Science
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- Imayama Takeshi
- Research Institute of Natural Sciences, Okayama University of Science
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- Yamamoto Shinji
- Graduate School of Environment and Information Sciences, Yokohama National University
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- Hirata Takafumi
- Geochemical Research Center, The University of Tokyo
Bibliographic Information
- Other Title
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- U–Pb zircon dating of Sanbagawa metamorphic rocks in the Besshi–Asemi-gawa region, central Shikoku, Japan, and tectonostratigraphic consequences
- U–Pb zircon dating of Sanbagawa metamorphic rocks in the Besshi–Asemi-gawa region
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Description
<p>The aim of this study is to addresses unresolved issues associated with the depositional and metamorphic ages of the Sanbagawa metamorphic rocks (central Shikoku, Japan). We performed laser-ablation inductively-coupled plasma mass spectrometry (LA-ICP-MS) zircon U-Pb analysis on psammitic schists from the Sanbagawa metamorphic rocks (sensu stricto) in the Besshi-Asemi-gawa region. Young U-Pb ages of ca. 100-90 Ma were found in all analysed samples, regardless of the metamorphic grade. These results suggest that the Sanbagawa metamorphic rocks from the upper chlorite to oligoclase-biotite zones are metamorphic equivalents of the Cretaceous Northern Shimanto accretionary complex, which also underwent prograde metamorphism after ca. 100-90 Ma. Based on our results and previous geochronological data from the Sanbagawa metamorphic rocks, we suggest that the Sanbagawa metamorphic belt consists of three metamorphic units, which are characterized by different depositional and metamorphic ages. These three units, from old to young, are here referred to as the Besshi, Asemi-gawa, and Oboke units.</p>
Journal
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- The Journal of the Geological Society of Japan
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The Journal of the Geological Society of Japan 125 (2), 183-194, 2019-02-15
The Geological Society of Japan
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Details 詳細情報について
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- CRID
- 1390564238099096576
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- NII Article ID
- 130007660919
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- NII Book ID
- AN00141768
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- ISSN
- 13499963
- 00167630
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- NDL BIB ID
- 029547427
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- Text Lang
- en
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- Article Type
- journal article
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- Data Source
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- JaLC
- NDL Search
- Crossref
- CiNii Articles
- KAKEN
- OpenAIRE
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- Abstract License Flag
- Disallowed