1994 Fiscal Year Final Research Report Summary
Strain analysis of minerals
| Project/Area Number |
03402019
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| Research Category |
Grant-in-Aid for General Scientific Research (A)
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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 |
KITAMURA Masao Department of Geology and Mineralogy, Faculty of Science, Professor, 理学部, 教授 (70004489)
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| Co-Investigator(Kenkyū-buntansha) |
SHIMOBAYASHI Narimasa Department of Geology and Mineralogy, Faculty of Science, Assistant Professor, 理学部, 助手 (70235688)
TOMITA Katsutoshi Department of Geology and Mineralogy, Faculty of Science, Assoc Professor, 理学部, 助教授 (70025352)
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| Project Period (FY) |
1991 – 1994
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| Keywords | Minerals / Strain analysis / Electron microscope / Ultra-sonic measurement / Opitical anormaly / Pseudo-tachylite |
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| Research Abstract |
The aim of the project is to detect of internal strain of natural minerals and to clarify the origin of the strain. In the project, the following three researches were carried out.
1. Effect of strain to fine textures of minerals : The effect in natural minerals such as diamonds was carried out. The results are as follows ; (1) Strain in natural diamonds distributes around the positions where the growth took place after the dissolution, indicating the growth under relatively high disequilibrium conditions. (2) Natural emerald showing the optical anomaly belongs to the triclinic symmetry group. (3) High-low transition of clinopyroxene is an athermal type of the martensitic transition. (4) Interfaces between aluminosilicates is controlled not by the strain but by interfacial energy.
2. Shock-deformation of chondrite : Chondrites and its powders were shock-compressed. The degree of melting increases with increasing of porosity of the materials. Based on the experimental results, shock-impacts of comet-like bodies are suggested to be the origin for chondrites.
3. Deformation of rocks : Pseudo-tachylite, which is considered to be fossil of earth quakes, is revealed to form through deformation-brecciation-melting processes.
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[Publications] Kitamura, M., Tsuchiyama, A., Watanabe, S., Shono, Y.and Fukuoka, K.: "Shock recovery experiments on chondritic materials." In High-Pressure Research : Application to Earth and Planetary Sciences, eds.Shono, Y.and Manghnani M.H., Terra Scientific Publishing Co., Tokyo. 333-340 (1992)
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