1995 Fiscal Year Final Research Report Summary
Development of the crust continental in the colision zone
| Project/Area Number |
05640530
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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 |
Petrology/Mineralogy/Science of ore deposit
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| Research Institution | KYOTO UNIVERSITY |
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Principal Investigator |
HIRAJIMA Takao Graduate School of Earth Science, Kyoto Univ., Assoc, Prof., 大学院・理学研究科, 助教授 (90181156)
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| Co-Investigator(Kenkyū-buntansha) |
BANNO Shohe Graduate School of Earth Science, Kyoto Univ., Prof., 大学院・理学研究科, 教授 (30019468)
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| Project Period (FY) |
1993 – 1995
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| Keywords | ultra-high pressure rocks / Eclogite / Coesite / Su-Lu metamorphic belt / Dora Maira Massif |
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| Research Abstract |
The indoor experiments for the ultra-high pressure (UHP) rocks from Dora Maira Massif, western Alps, and from Su-Lu region in the Shandong Peninsula, China, were carried out.
Based on more than 600 thin section observation of the Dora Maira samples, a precise P-T-t path of the UHP rocks, especially P-T conditions of the climax UHP stage and a retrograde stage but under still higher pressure condition, were determined. A new amphibole group mineral, ferronyboeite was also identified as a retrograde phase of UHP rocks. The output of our geological and petrological studies were referred in two guide books of international meetings held in 1994 and 1995 in Italy.
Our study in the Shandong Peninsular reveals following facts :
1) The spatial distribution of the UHP rocks were determined in the Shandong Peninsular ; the area to the South of the Yantai-Qingdao-Wullian Fault.
2) UHP evidence were found from various kind of lithotypes, e.g., garnet-lherzolite, marble and metagranite. The UHP metagranite in Shandong is the first example in the Asia, and the second in the world.
3) Rb-Sr dating of the gneissose rocks indicates that the LP gneiss in the NW area of the Peninsular shows significantly older age (1800Ma) than the gneiss in the UHP area (700Ma). The latter age suggest the basement of the UHP area were correlated to the Yangtzi Craton.
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[Publications] Compagnoni, R., Hirajima, T., and Chopin, C.,: "Chapter7: Ultra-high-pressure metamorphic rocks in the western Alps." Ultrahigh pressure metamorphism"eds. by Coleman, R. G., and Wnag, X.,. 206-243. (1995)
Description
「研究成果報告書概要(和文)」より
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[Publications] Hiramatsu, N., Banno, S., Hirajima, T., and Cong. B.,: "Ultrahigh-pressure garnet lherzolite from Chijiadian, Rongcheng County, in the Su-Lu region of eastern China." lsland Arc,. 4,. 324-333. (1995)
Description
「研究成果報告書概要(和文)」より
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