Peak conditions of kyanite-bearing quartz eclogites in the Sanbagawa metamorphic belt, central Shikoku, Japan
スポンサーリンク
概要
- 論文の詳細を見る
Kyanite-bearing eclogitic assemblages occur in the highest-grade zone of the Sanbagawa metamorphic belt, central Shikoku, Japan. The eclogites consist mainly of garnet, omphacite, phengite, kyanite, epidote, quartz and rutile. Compositionally variable amphibole (glaucophane/barroisite/pargasite), phengite and paragonite occur as inclusions in garnet and other eclogite facies phases. Careful examination of garnet zoning in kyanite-eclogites suggests that (i) most garnet grains show complex zoning consisting of relatively Ca-rich/Mg-poor inner and Ca-poor/Mg-rich outer segments, (ii) the inner segment of the zoned garnet formed at the eclogite facies stage, and (iii) the Mg-rich outermost rim of garnet does not always represents a composition at peak eclogite stage but could form at lower-pressure conditions of subsequent epidote-amphibolite facies. The assemblage of inner segment of garnet, omphacite, phengite, kyanite and quartz points to equilibrium conditions of 2.3-2.4 GPa/675-740 °C. The metamorphic P-T conditions of the eclogite facies stage reported in literature have been estimated assuming that the outermost rim of garnet with Mg-rich composition was in equilibrium with other eclogite facies phases. Therefore, P-T estimations of the eclogite facies stage in the Sanbagawa metamorphic belt should be re-examined carefully on the basis of textural and compositional heterogeneities of constituent minerals.
- 日本鉱物科学会の論文
- 2007-12-01
著者
-
ENAMI Masaki
Department of Earth and Planetary Sciences, Nagoya University
-
MIYAMOTO Atsushi
Department of Computer and Mathematical Sciences, Graduate School of Information Sciences, Tohoku Un
-
Enami Masaki
Dep. Of Earth And Planetary Sciences Nagoya Univ.
-
横山 一己
国立科博・地学
-
Enami Masaki
Department Of Earth And Planetary Sciences Graduate School Of Science Nagoya University
-
YOKOYAMA Kazumi
Department of Geology and Paleontology, National Museum of Nature and Science
-
TSUBOI Motohiro
Department of Earth and Planetary Sciences, Nagoya University
-
Tsuboi Motohiro
Dep. Of Chemistry School Of Sci. And Technol. Kwansei Gakuin Univ.
-
Tsuboi Motohiro
Department Of Chemistry School Of Science And Technology Kwansei Gakuin University
-
Miyamoto Atsushi
Department Of Cardiovascular Medicine School Of Medicine Hokkaido University
-
Miyamoto Atsushi
Department Of Earth And Planetary Sciences Nagoya University
-
Yokoyama Kazumi
Department Of Geology And Paleontology National Museum Of Nature And Science
-
Yokoyama Kazumi
Dep. Of Geology And Paleontology National Museum Of Nature And Sci.
関連論文
- 東北日本における石炭紀花崗岩質岩及び変成岩の年代とその配列
- ペルーワンサラ鉱山産の新鉱物、huanzalaite (MgWO_4) について
- 金鉱山及び漂砂鉱床中の金及びエレクトラムの化学組成による産地推定と考古学への応用
- A1 中華人民共和国内モンゴル自治区白雲鄂博産の新種のカリウム四ケイ素フッ素雲母,yangzhumingite(楊主明雲母),KMg_Si_4O_F_2(口頭発表,一般講演)
- 千葉県南房総市産嶺岡層群凝灰岩中の chevkinite-(Ce)
- Momoiite, (Mn2+,Ca)3(V3+,Al)2Si3O12, a new manganese vanadium garnet from Japan
- 中国内蒙古自治区バヤンオボ(ニオブ-希土類元素-鉄)鉱床の鉱物に関する予察的研究
- 東京都奥多摩町白丸鉱山産ベニト石
- 中国内モンゴル白雲鄂博産の新鉱物, 張培善石
- 福岡県河東鉱山産の新鉱物、宗像石