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The Ochiai-Hokubo complex consists of spinel lherzolite, spinel harzburgite, dunite, wehrlite and clinopyroxenite, and the Horoman peridotite complex, of plagioclase lherzolite, spinel lherzolite, spinel harzburgite, dunite, wehrlite, and a small amounts of gabbro and pyroxenite. The basic structure, an alternation of harzburgite-lherzolite and dunite-wehrlite, is common to the two complexes. In harzburgite and lherzolite, Cr# (=Cr/(Cr+Al) atomic ratio) of spinel widely varies, from 0.15 to 0.78 in the Ochiai-Hokubo complex, 0.08 to 0.68 in the Horoman complex. In the Horoman complex, the Cr# of spinel rapidly increases with an increase of Fo content of coexisting olivine (88.8-92.8). On the other hand, Fo content of olivine in the Ochiai-Hokubo harzburgite-lherzolite (mostly 88-90) does not correlate with the Cr# of spinel. The Horoman harzburgite and lherzolite is similar to ordinary mantle peridotite on textural, modal and chemical compositions. The Cpx/(Cpx+Opx) ratio rapidly decreases with an increase of Cr# of spinel, and is around 0.1 when Cr#=0.5 and is zero when Cr#\u003e0.6. On the other hand, the Ochiai-Hokubo harzburgite-lherzolite is different from ordinary mantle peridotite; Cr-rich spinel (Cr#\u003e0.5) coexists with relatively coarse diopside (up to 1 mm across). In dunite and wehrlite from both complexes, Fe^\u003c2+\u003e content of olivine and Ti and Fe^\u003c3+\u003e contents of spinel are higher than those of lherzolite and harzburgite. The lherzolite and harzburgite in the Horoman complex are simple residual peridotites which were formed by melting and melt extraction. The deviation of the Ochiai-Hokubo harzburgite-lherzolite from the ordinary mantle peridotite in the modal and chemical characteristics is due to its interaction between infiltrating anhydrous melts and wall rock lherzolite. The dunite and wehrlite are a cumulate from the infiltrating melts modified by the interaction. 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落合-北房岩体と幌満岩体の比較成因論:マントル溶融過程の多様性 (日高地殻--マントル系のマグマ活動)
http://hdl.handle.net/2297/2541
http://hdl.handle.net/2297/2541e2c54d07-dfee-4af6-b219-2a35383ad3a8
名前 / ファイル | ライセンス | アクション |
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AN00141779-ARAI-47-2.pdf (1.4 MB)
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Item type | 学術雑誌論文 / Journal Article(1) | |||||
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公開日 | 2017-10-03 | |||||
タイトル | ||||||
タイトル | 落合-北房岩体と幌満岩体の比較成因論:マントル溶融過程の多様性 (日高地殻--マントル系のマグマ活動) | |||||
タイトル | ||||||
言語 | en | |||||
タイトル | Ochiai-Hokubo peridotite and Horoman peridotite : a genetical comparison for insight into diverse melting processes in the upper mantle | |||||
言語 | ||||||
言語 | jpn | |||||
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 | journal article | |||||
著者 |
松影, 香子
× 松影, 香子× 荒井, 章司 |
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提供者所属 | ||||||
内容記述タイプ | Other | |||||
内容記述 | 金沢大学大学院自然科学研究科 | |||||
書誌情報 |
地質学論集 巻 47, p. 173-183, 発行日 1997-04-01 |
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ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 0385-8545 | |||||
出版者 | ||||||
出版者 | 日本地質学会 | |||||
抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | 上部マントルでの溶融条件の多様性を理解するために, 落合-北房超苦鉄質岩体(以下O-H岩体)と幌満かんらん岩体の比較を行った。両岩体は基本的構造が類似しており、レールゾライト, ハルツバージャイトからなる層とダナイト, ウェールライトからなる層の互層をなす。幌満岩体のレールゾライト, ハルツバージャイトの組織, モード組成, 鉱物の化学組成は一般的なマントルかんらん岩の性質を有しているが, O-H岩体のハルツバージャイト/レールゾライトはCr#が0.5以上のスピネルを有する岩相においても, Cpx/(Cpx+Opx)体積比が0.1以上になるものが存在し, 特異な性質を示している。両者の違いは溶融条件の違いによっている。幌満岩体のハルツバージャイトは部分溶融による単純な溶け残り岩として説明されるが, O-H岩体のものはより深部起源のメルトとメルトの通り道の壁岩のかんらん岩が相互に成分の交換を行いつつ溶融した"メルト, マントル相互作用による溶け残り岩"として説明される。 The Ochiai-Hokubo peridotite complex, the Sangun zone, southwest Japan, and the Horoman peridotite complex, the Hidaka Zone, Hokkaido, are compared with one another, to understand the diversity of melting process in the upper mantle. The Ochiai-Hokubo complex consists of spinel lherzolite, spinel harzburgite, dunite, wehrlite and clinopyroxenite, and the Horoman peridotite complex, of plagioclase lherzolite, spinel lherzolite, spinel harzburgite, dunite, wehrlite, and a small amounts of gabbro and pyroxenite. The basic structure, an alternation of harzburgite-lherzolite and dunite-wehrlite, is common to the two complexes. In harzburgite and lherzolite, Cr# (=Cr/(Cr+Al) atomic ratio) of spinel widely varies, from 0.15 to 0.78 in the Ochiai-Hokubo complex, 0.08 to 0.68 in the Horoman complex. In the Horoman complex, the Cr# of spinel rapidly increases with an increase of Fo content of coexisting olivine (88.8-92.8). On the other hand, Fo content of olivine in the Ochiai-Hokubo harzburgite-lherzolite (mostly 88-90) does not correlate with the Cr# of spinel. The Horoman harzburgite and lherzolite is similar to ordinary mantle peridotite on textural, modal and chemical compositions. The Cpx/(Cpx+Opx) ratio rapidly decreases with an increase of Cr# of spinel, and is around 0.1 when Cr#=0.5 and is zero when Cr#>0.6. On the other hand, the Ochiai-Hokubo harzburgite-lherzolite is different from ordinary mantle peridotite; Cr-rich spinel (Cr#>0.5) coexists with relatively coarse diopside (up to 1 mm across). In dunite and wehrlite from both complexes, Fe^<2+> content of olivine and Ti and Fe^<3+> contents of spinel are higher than those of lherzolite and harzburgite. The lherzolite and harzburgite in the Horoman complex are simple residual peridotites which were formed by melting and melt extraction. The deviation of the Ochiai-Hokubo harzburgite-lherzolite from the ordinary mantle peridotite in the modal and chemical characteristics is due to its interaction between infiltrating anhydrous melts and wall rock lherzolite. The dunite and wehrlite are a cumulate from the infiltrating melts modified by the interaction. The difference in petrological characteristics between these complexes resulted from differences in the amount of infiltrating melt and the efficiency of melt extraction. | |||||
権利 | ||||||
権利情報 | 日本地質学会の許諾を得て登録 | |||||
著者版フラグ | ||||||
出版タイプ | VoR | |||||
出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 |