1992 Fiscal Year Final Research Report Summary
Image processing of X-ray image and the reaction texture of metam rocks
| Project/Area Number |
02640627
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
鉱物学(含岩石・鉱床学)
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| Research Institution | KYOTO UNIVERSITY |
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Principal Investigator |
BANNO Shohei Dept.Min.petr.Fac.Sci.Kyoto university, 理学部, 教授 (30019468)
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| Co-Investigator(Kenkyū-buntansha) |
OKAMOTO K. Dept.Earth Sci.Fac.General Sci.,Osaka prefecture Univ., 総合科学部, 助手 (50109873)
HIRAJIMA T. Dept.Geol.Min.Fac.Sci.kyoto university, 理学部, 助手 (90181156)
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| Project Period (FY) |
1990 – 1992
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| Keywords | X-ray / Low p metamorphism / High p metamorphism / Ultrahigh pressure / P / T Path / Alps / Sambagawa / Shandeng |
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| Research Abstract |
This project aimed to establish accurate P-T-t path of regional metamorphic belts. The texture of metamorphic rocks were examined in detail by use of image processing of element distribution obtained by an electron micro-probe.
Banno was responsible for low and high pressure metamorphism,and Hirajima on ultrahigh pressure metamorphism.Okamoto was involved in theoretical study and image processing.
The low pressure metamorphism was studied by graduate student Ikeda,who established the facies series of Ryoke metamorphism and clarified relationship between the heterogeneity of garnet,the temperature and the grain size.
Banno collaborating with Ernst of Stanford concluded that jadeite in the Franciscan was formed by irreversible reaction owing to overstepping of equilibrium and hence its P-T path reached well into jadeite+quartz field,and denied prograde path to enter albite-lawsonite field.Hirajima jointly with Kitamura and Wallis,found sector zoned garnet from a Sanbagawa schist.
Hirajama established the P-T path in both Dora Maira of the Alps and the Shandeng province in China.Image processing of UHP minerals made it possible to identify prograde inclusions and retrograde decomposition minerals,and to conclude rapid prograde and retrograde metamorphism was accompanied by rapid burial and exhumation,i.e.,rapid increase and decrease of metamorphic pressure of Chinese UHP terrains.
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[Publications] Hirajima,T.,Ishiwatari,A.,Cong,B-I.,Zhang, Ruyuan,Banno,S.and *Nosaka, T.: "Coesite from Mengzhong eclogite at Donghai county, northeastern Jiangsu province,China." Min.Mag.54.579-583 (1990)
Description
「研究成果報告書概要(欧文)」より
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