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  1. B100 理学部/理学研究科
  2. B100d 学位論文
  3. 博士論文(理博・論理博)

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
91daad63-b0dc-42c7-a8ef-d6ab191e1ef5
名前 / ファイル ライセンス アクション
ot4649_abstr.pdf ot4649_abstr.pdf (199.2 kB)
ot4649.pdf ot4649.pdf (4.1 MB)
Item type 学位論文 / Thesis or Dissertation(1)
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
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
著者 竹内, 誠

× 竹内, 誠

WEKO 12531

竹内, 誠

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Takeuchi, Makoto

× Takeuchi, Makoto

WEKO 12532

Takeuchi, Makoto

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抄録
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.
内容記述タイプ Abstract
内容記述
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
内容記述タイプ Other
言語
言語 jpn
資源タイプ
資源 http://purl.org/coar/resource_type/c_46ec
タイプ thesis
書誌情報 発行日 1994-08-10
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 13901乙第4649号
フォーマット
application/pdf
フォーマット
application/pdf
著者版フラグ
値 publisher
URI
識別子 http://hdl.handle.net/2237/6599
識別子タイプ HDL
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