U–Pb ages of syenitic and granitic rocks in the Ashizuri igneous complex, southwestern Shikoku: Constraint for the origin of the forarec alkaline magmatism
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- SHINJOE HIRONAO
- Tokyo Keizai University
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- ORIHASHI YUJI
- Earthquake Research Institute, University of Tokyo
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- SUMII TOMOAKI
- Geological Survey of Japan, AIST
書誌事項
- タイトル別名
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- U-Pb zircon ages of syenitic and granitic rocks in the Ashizuri igneous complex, southwestern Shikoku: Constraint for the origin of forearc alkaline magmatism
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説明
We report two first U-Pb zircon ages of the felsic rocks in the Ashizuri igneous complex, southwestern Shikoku, using the LA-ICP-MS. Samples are a syenite (ASH54) and a biotite granite (ASH5). Weighted means of the 238U-206Pb ages of concordant data of ASH54 and ASH5 are 13.12 ± 0.09 Ma (2σ) and 12.95 ± 0.06 Ma (2σ), respectively. It is concluded that the felsic member of the Ashizuri complex was formed almost simultaneously at ca. 13 Ma after the major activity of the Outer Zone Granitic Rocks. Presence of alkali dolerite dike cutting the syenite indicates that the alkali basaltic magma intruded after the subduction of Shikoku Basin of the Philippine Sea plate beneath the southwest Japan arc. Alkali basaltic magma of Ashizuri complex may have been derived from a depth possibly deeper than that of subducted Shikoku Basin of the Philippine Sea Plate.
収録刊行物
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- GEOCHEMICAL JOURNAL
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GEOCHEMICAL JOURNAL 44 (4), 275-283, 2010
一般社団法人日本地球化学会
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詳細情報 詳細情報について
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- CRID
- 1390001204552988416
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- NII論文ID
- 130004469300
- 10026606355
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- NII書誌ID
- AA00654975
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- COI
- 1:CAS:528:DC%2BC3cXht12qsrnI
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- ISSN
- 18805973
- 00167002
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- NDL書誌ID
- 10793549
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
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