| Project/Area Number |
06640615
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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 | Gifu University |
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Principal Investigator |
KOIDO Yoshimitsu Gifu University, Faculty of Education, Associate professor, 教育学部, 助教授 (60101424)
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| Project Period (FY) |
1994 – 1995
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| Project Status |
Completed (Fiscal Year 1995)
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| Budget Amount *help |
¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 1995: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1994: ¥700,000 (Direct Cost: ¥700,000)
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| Keywords | Alkali feldspar / Ordering / Nohi Rhyolite / Welded tuff sheet / Cooling unit |
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| Research Abstract |
It is generally accepted that transition from orthoclase to microcline proceeds not only slow cooling but also with water as a catalyzer. These conditions may exist in the central portion of a thin cooling unit or in the central and upper portions of a thick one.
X-ray diffraction studies of alkali feldspars from the Akaishi Welded Tuff Sheet in the Cretaceous Nohi Rhyolite indicate that these feldspars have the two cycles of same diffraction pattern suggesting that they belong to a thin cooling unit (100-200m in thickness). Those from the Takadaru Welded Tuff Sheet in the Rhyolite indicate that these feldspars have the two cycles of same diffraction pattern suggesting that that they belong to a thick cooling unit (250-350m in thickness).
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