2010 Fiscal Year Final Research Report
Precise and reliable argon geochronology of high- and ultra high-pressure metamorphic rocks
| Project/Area Number |
20244087
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Petrology/Mineralogy/Science of ore deposit
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| Research Institution | Okayama University of Science |
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Principal Investigator |
ITAYA Tetsumaru Okayama University of Science, 自然科学研究所, 教授 (60148682)
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| Co-Investigator(Kenkyū-buntansha) |
HYODO Hironobu 岡山理科大学, 自然科学研究所, 教授 (50218749)
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| Project Period (FY) |
2008 – 2010
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| Keywords | 高圧・超高圧変成岩 / 海洋性物質起源 / 変成作用 / 変形作用 / 沈み込み帯 / 上昇過程 / 白雲母アルゴン年代学 / アルゴン離散 |
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| Research Abstract |
Basic research was carried out to reveal the metamorphism and the subsequent exhumation process of high and ultra-high pressure metamorphic rocks. In a part of the achievement, we set up the micro-probe Ar-Ar facilities equipped with UV laser. With analyses using the new facilities and the conventional ones, we examined the relationships among geological structure, thermal structure and phengite ages of the high-pressure metamorphic belts in Pacific type orogenic belt. This approach revealed two different exhumation processes of the belts. We interpreted the differences are due to the natures of oceanic plate boundaries that subduct into the deeper part of subduction zone.
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