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Title Transcription
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
Title Alternative (English)
Fluid Indusion study of pelitic Migmatite from Oki-Dogo lsland
File
language
jpn
Author
Kashima, Takashi
Tsunogae, Toshiki
Description
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.
Subject
Fluid inclusion
Isochore
Graphite
Pelitic migmatite
Oki-Dogo
Journal Title
Memoirs of the Faculty of Education, Shimane University
Volume
31
Issue
自然科学
Start Page
35
End Page
43
ISSN
05869943
Published Date
1997-12-01
Publisher
島根大学教育学部
NII Type
Departmental Bulletin Paper
Format
PDF
Text Version
出版社版
OAI-PMH Set
Faculty of Education
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