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Mineral parageneses of basic to intermediate metamorphic rocks in the Yamato Mountains, East Antarctica
https://nipr.repo.nii.ac.jp/records/1477
https://nipr.repo.nii.ac.jp/records/1477fd419bd0-251d-45e4-8f30-316d3aeae194
名前 / ファイル | ライセンス | アクション |
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KJ00000012110 (1.9 MB)
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Item type | 紀要論文(ELS) / Departmental Bulletin Paper(1) | |||||||||
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公開日 | 1983-10-01 | |||||||||
タイトル | ||||||||||
言語 | en | |||||||||
タイトル | Mineral parageneses of basic to intermediate metamorphic rocks in the Yamato Mountains, East Antarctica | |||||||||
言語 | ||||||||||
言語 | eng | |||||||||
資源タイプ | ||||||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||||||
資源タイプ | departmental bulletin paper | |||||||||
ページ属性 | ||||||||||
内容記述タイプ | Other | |||||||||
内容記述 | P(論文) | |||||||||
著者名(英) |
Asami, Masao
× Asami, Masao
× Shiraishi, Kazuyuki
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著者所属(英) | ||||||||||
en | ||||||||||
Department of Geological Sciences, College of Liberal Arts, Okayama University/National Institute of Polar Research | ||||||||||
抄録(英) | ||||||||||
内容記述タイプ | Other | |||||||||
内容記述 | Two groups of metamorphic rocks are found in association with syenitic and granitic rocks in the Yamato Mountains; Group I includes two-pyroxene-bearing gneiss and amphibolite, whereas Group II consists of granitic gneiss and associated rocks accompanied by no orthopyroxene. Mineral parageneses of basic to intermediate metamorphic rocks of the two groups were examined in the simplified system (Al)_2O_3-FeO-MgO-CaO-(Na)_2O. Microprobe analyses reveal that hornblende of Group I is of pargasitic composition but hornblende of Group II has broad compositions ranging from tremolitic to pargasitic ones. Mineral parageneses of the two groups are incompatible with each other in such ways that the hornblende-plagioclase assemblage of Group I has higher (Na/Ca)^<M4>_<Hb>/(Na/Ca)_<P1> values than that of Group II, and that the clinopyroxene-hornblende tie lines of Group II are mostly included in the two-pyroxene-hornblende triangles of Group I in the (Al)_2O_3-FeO-MgO-CaO tetrahedron. The hornblende-bearing assemblages of Group II are considered to be of the amphibolite facies but not the granulite facies. Although no direct contact between the granulite-facies and amphibolite-facies metamorphic rocks has been found in the Yamato Mountains, the geological and petrological relations of the syenitic rocks to the metamorphic rocks suggest that the granulite-facies rocks and the syenitic rocks form a geological unit which is in tectonic contact with the other geological unit composed of the amphibolite-facies rocks. | |||||||||
雑誌書誌ID | ||||||||||
収録物識別子タイプ | NCID | |||||||||
収録物識別子 | AA00733561 | |||||||||
書誌情報 |
Memoirs of National Institute of Polar Research. Special issue 巻 28, p. 198-214, 発行日 1983-10 |