Petrological characteristics of basalts from the Miocene Nanamagari Formation in Ishikawa Prefecture. Low-K basalts from the back-arc side of central Japan.
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- SAKAYORI Atsushi
- Department of Earth Sciences, Faculty of Education, Kanazawa University
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- KAWAMURA Jun-ichi
- TMK Co.
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- YAMAGISHI Tomokazu
- Nango Elementary School
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- SUGIMOTO Mikihiro
- Department of Earth Sciences, Faculty of Education, Kanazawa University
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- YOSHIDA Takeyoshi
- Institute of Mineralogy, Petrology and Economic Geology, Graduate School of Science, Tohoku University
Bibliographic Information
- Other Title
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- 石川県の中新統七曲層中に産する玄武岩の岩石学的特徴 背弧側地域の低カリウム玄武岩
- イシカワケン ノ チュウシントウ ナナマガリソウチュウ ニ サンスル ゲンブガ
- —— Low-K basalts from the back-arc side of central Japan ——
- —— 背弧側地域の低カリウム玄武岩 ——
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Abstract
The Nanamagari Formation of the Miocene in the back-arc side of central Japan is composed mainly of silicic pyroclastic rocks associated with basaltic pyroclastic rocks and dikes. New and published K-Ar ages and biostratigraphic ages indicate that the basaltic volcanism occurred during 16-12 Ma. This volcanism may have associated with opening of the Japan Sea back-arc basin. By comparison with experimental data, we estimated that the possible primary magmas of these basalts were segregated from the upper mantle at about 1.4 GPa, 1330°C. The basaltic rocks show a trace element abundance pattern typical of island arc low-K basalts. The incompatible element ratios suggest that these basalts were derived from the mantle source similar to the magma source of basalts from the Quaternary volcanic front of northeast Japan.
Journal
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- JOURNAL OF MINERALOGY, PETROLOGY AND ECONOMIC GEOLOGY
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JOURNAL OF MINERALOGY, PETROLOGY AND ECONOMIC GEOLOGY 92 (10), 410-424, 1997
Japan Association of Mineralogical Sciences
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Details 詳細情報について
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- CRID
- 1390282681211028736
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- NII Article ID
- 10002089398
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- NII Book ID
- AN10047992
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- COI
- 1:CAS:528:DyaK1cXjs1aiuw%3D%3D
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- ISSN
- 18813275
- 09149783
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- NDL BIB ID
- 4378231
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed