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タイトルヨミ
オキ ドウゴ ノ デイシツ ミグマタイト ニ フクマレル リュウタイ ホウユウブツ ノ ケンキュウ
日本語以外のタイトル
Fluid Indusion study of pelitic Migmatite from Oki-Dogo lsland
ファイル
言語
日本語
著者
鹿島 崇
角替 敏昭
内容記述(抄録等)
Thisstudy examined composition offluid inclusionsin leucocratic and melanocratic pads of pelitic migmatites from oki-Dogo to understand fluid activity throughout p-T history of high-T/10W-p metamorphic terrane. Calculated fluid density and isochores range from o.73 to o.84 g/cm3 and from 450 to 540゜c at 3 kbar, respectively, for H20, and from o.71 to o.87 g/cm3 and from 540 t0860゜c for c02 indusions. The temperature range for the C02 indusions is almost consistent with previously estimated peak and retrogade conditions; 750~820゜c at 1.5~4 kbar for peak and 580~630゜c at 29~3.9 kbar for retrograde conditions. The range for the H20 inclusions
is, however, significanuy lower than the retrograde condition. our results therefore suggest that co.-bearing auid was dominant during peak to retrograde metamorphism, while H.0-rich fluid infiltrated at the last stage of metamorphism.
Graphite is the most probable source of co. because the co. inclusion becomes dominant with increasing modal abundance of graphite in migmatites. origin of H20 is not clearly understood, but probably associated with an uplifting of metamorphic terrane providing H.0-bearing hydrothermal auid from middle crust. The Iater H20 infiltration brought about hydration of garnet and biotite to chlorite and muscovite, which marks the end of thermal events of oki metamorphic rocks.
主題
Fluid inclusion
Isochore
Graphite
Pelitic migmatite
Oki-Dogo
掲載誌名
島根大学教育学部紀要
31
自然科学
開始ページ
35
終了ページ
43
ISSN
05869943
発行日
1997-12-01
出版者
島根大学教育学部
資料タイプ
紀要論文
ファイル形式
PDF
著者版/出版社版
出版社版
部局
教育学部
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