中新世の日本海拡大に伴う東北日本前弧域火山活動 茨城県，塩子無斑晶状安山岩の地球化学的特徴
茨城県城里町塩子に分布するアルミナに乏しく，鉄に富む無斑晶状安山岩の貫入岩から，新たに16.40±0.10 MaのK‒Ar年代値を得た．また微量成分組成とSr‒Nd同位体比から，この火山岩が近傍の元古沢玄武岩に近い組成の苦鉄質マグマの結晶分化で生成された残液マグマ起源であることを明らかにし，元古沢玄武岩については日本海拡大時の高温アセノスフェアの注入により溶融した島弧リソスフェア性マントルに由来する可能性を示した．...
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| Published in | 地質学雑誌 Vol. 129; no. 1; pp. 165 - 177 |
|---|---|
| Main Authors | , |
| Format | Journal Article |
| Language | Japanese |
| Published |
一般社団法人 日本地質学会
16.03.2023
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| Subjects | |
| Online Access | Get full text |
| ISSN | 0016-7630 1349-9963 |
| DOI | 10.5575/geosoc.2022.0054 |
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| Abstract | 茨城県城里町塩子に分布するアルミナに乏しく，鉄に富む無斑晶状安山岩の貫入岩から，新たに16.40±0.10 MaのK‒Ar年代値を得た．また微量成分組成とSr‒Nd同位体比から，この火山岩が近傍の元古沢玄武岩に近い組成の苦鉄質マグマの結晶分化で生成された残液マグマ起源であることを明らかにし，元古沢玄武岩については日本海拡大時の高温アセノスフェアの注入により溶融した島弧リソスフェア性マントルに由来する可能性を示した． |
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| AbstractList | 茨城県城里町塩子に分布するアルミナに乏しく，鉄に富む無斑晶状安山岩の貫入岩から，新たに16.40±0.10 MaのK‒Ar年代値を得た．また微量成分組成とSr‒Nd同位体比から，この火山岩が近傍の元古沢玄武岩に近い組成の苦鉄質マグマの結晶分化で生成された残液マグマ起源であることを明らかにし，元古沢玄武岩については日本海拡大時の高温アセノスフェアの注入により溶融した島弧リソスフェア性マントルに由来する可能性を示した． |
| Author | 山元, 孝広 山﨑, 誠子 |
| Author_xml | – sequence: 1 fullname: 山﨑, 誠子 organization: 産業技術研究所地質調査総合センター活断層・火山研究部門 – sequence: 1 fullname: 山元, 孝広 organization: 産業技術研究所地質調査総合センター活断層・火山研究部門 |
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| ContentType | Journal Article |
| Copyright | 2023 日本地質学会 |
| Copyright_xml | – notice: 2023 日本地質学会 |
| DOI | 10.5575/geosoc.2022.0054 |
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| Discipline | Geology |
| EISSN | 1349-9963 |
| EndPage | 177 |
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| Snippet | 茨城県城里町塩子に分布するアルミナに乏しく，鉄に富む無斑晶状安山岩の貫入岩から，新たに16.40±0.10... |
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| SubjectTerms | fore-arc volcanism geochemistry Ibaraki Prefecture K-Ar age Miocene Shiogo Aphyric Andesite |
| Subtitle | 茨城県，塩子無斑晶状安山岩の地球化学的特徴 |
| Title | 中新世の日本海拡大に伴う東北日本前弧域火山活動 |
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