書誌事項
- タイトル別名
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- Petrological characteristics of the dunite-harzburgite-chromitite complexes of the Sangun zone, Southwest Japan.
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説明
There are many ultramafic complexes in the Sangun zone in central Chugoku district, Southwest Japan: they are Shiratakiyama, Tari-Misaka, Inazumiyama, Mochimaru, Yagami, Kasamatsu, Takase, Mimuro, Ashidachi, Yufune, Yanomine, Suishoyama, Niimi, Osa, Tajibe, Fuse, Taguchi, Harashige, and Ochiai-Hokubo. Lithological variations in these complexes were determined for both primary and thermal metamorphic mineral assemblages.<br> With one exception (the Ochiai-Hokubo complex) they consist of harzburgite, dunite and chromitite, and are intruded by some gabbroic dikes. Harzburgite is always dominant over dunite. Chromitite is closely associated with dunite: a chromitite body is enclosed by a dunite envelope and large chromitite bodies are exclusively found in relatively dunite-dominant complexes. The lithological features indicate their derivation from the transition zone or the uppermost mantle member of ophiolitic suites.<br> The complexes are frequently suffered from the thermal metamorphism by some younger granitic masses. The contact aureole is divided into five mineral zones, Ia (chrysotile/lizardite), Ib (antigorite), II (olivine-talc), III (olivine-anthophyllite) and IV (olivine-orthopyroxene) in order of increasing metamorphic grade. The highest metamorphic grade attained is different dependent on the distance from and rock facies (temperature) of granitic magmas.
収録刊行物
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- 岩鉱
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岩鉱 90 (1), 13-26, 1995
一般社団法人 日本鉱物科学会
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詳細情報 詳細情報について
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- CRID
- 1390001206234123648
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- NII論文ID
- 130004493564
- 30025042218
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- ISSN
- 18813275
- 09149783
- http://id.crossref.org/issn/09149783
- http://id.crossref.org/issn/03610128
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- 本文言語コード
- ja
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- データソース種別
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- JaLC
- Crossref
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可
