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Changes in garnet chemistry show a progressive denudation of the source areas for Permian-Jurassic sandstones,Southern Kitakami Terrane,Japan
http://hdl.handle.net/2237/6599
http://hdl.handle.net/2237/659991daad63-b0dc-42c7-a8ef-d6ab191e1ef5
| 名前 / ファイル | ライセンス | アクション |
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ot4649_abstr.pdf (199.2 kB)
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ot4649.pdf (4.1 MB)
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| Item type | 学位論文 / Thesis or Dissertation(1) | |||||
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| 公開日 | 2006-06-22 | |||||
| タイトル | ||||||
| タイトル | Changes in garnet chemistry show a progressive denudation of the source areas for Permian-Jurassic sandstones,Southern Kitakami Terrane,Japan | |||||
| 言語 | en | |||||
| その他のタイトル | ||||||
| その他のタイトル | ザクロ石の化学組成変化が示す南部北上帯二畳紀-ジュラ紀砂岩の供給地の累進的削剥 | |||||
| 言語 | ja | |||||
| 著者 |
竹内, 誠
× 竹内, 誠× Takeuchi, Makoto |
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| アクセス権 | ||||||
| アクセス権 | open access | |||||
| アクセス権URI | http://purl.org/coar/access_right/c_abf2 | |||||
| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | Garnet is a widespread detrital mineral in Permian to Jurassic sandstones of the Southern Kitakami Terrane. Electron-probe microanalyses of these garnets show a gradual change of chemistry with the age of the sandstones. The dominant garnet suites in Permian to Triassic sandstones are grandite, with some spessartine-almandine in Upper Triassic sandstones. However, in Lower Jurassic sandstones, pyrope-almandine and spessartine-almandine garnets are common, whereas grandite garnets are absent. Garnet suites in Middle to Upper Jurassic sandstones are dominated by pyrope-almandine garnet. The grandite-dominant suites are associated with hornblende, epidote and titanite, whereas the pyrope-almandine-dominant suites are associated with biotite. These grandite garnets are rich in andradite and have very low spessartine, almandine and pyrope contents. Some of the grandite garnets are anisotropic with oscillatory zoning and sector twinning, typical of calcic skarn deposits. Spessartine-almandine garnets are common in low-grade metamorphic rocks. The diverse suites of pyropealmandine garnets (up to 42 mol. % pyrope) from the Jurassic sandstones are typical of epidote-amphibolite to granulite facies metamorphic rocks. The chemistry and optical propeties of garnets and the heavy-mineral data show that low-grade or contact metamorphic rocks such as skarns and hornfelses were widely exposed in the source areas of the Permian to Triassic sandstones. High-grade metamorphic rocks, including granulites and intrusive rocks, appeared in Early Jurassic time and were widespread in Middle Jurassic time. The critical change in the source areas for the Southern Kitakami Terrane occurred during Late Triassic to Early Jurassic time, and may correspond to the Indosinian movements associated with the collision between the North China and South China Blocks. | |||||
| 言語 | en | |||||
| 内容記述 | ||||||
| 内容記述タイプ | Other | |||||
| 内容記述 | 名古屋大学博士学位論文 学位の種類:博士(理学) (論文) 学位授与年月日:平成6年8月10日 | |||||
| 言語 | ja | |||||
| 言語 | ||||||
| 言語 | jpn | |||||
| 資源タイプ | ||||||
| 資源 | http://purl.org/coar/resource_type/c_db06 | |||||
| タイプ | doctoral thesis | |||||
| 書誌情報 |
発行日 1994-08-10 |
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| 学位名 | ||||||
| 言語 | ja | |||||
| 学位名 | 博士(理学) | |||||
| 学位授与機関 | ||||||
| 学位授与機関識別子Scheme | kakenhi | |||||
| 学位授与機関識別子 | 13901 | |||||
| 言語 | ja | |||||
| 学位授与機関名 | 名古屋大学 | |||||
| 言語 | en | |||||
| 学位授与機関名 | Nagoya University | |||||
| 学位授与年度 | ||||||
| 学位授与年度 | 1994 | |||||
| 学位授与年月日 | ||||||
| 学位授与年月日 | 1994-08-10 | |||||
| 学位授与番号 | ||||||
| 学位授与番号 | 乙第4649号 | |||||
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| 値 | publisher | |||||
| URI | ||||||
| 識別子 | http://hdl.handle.net/2237/6599 | |||||
| 識別子タイプ | HDL | |||||
