1996 Fiscal Year Final Research Report Summary
Explanation of reaction mechanism among solution, gas and minerals in hydrothermal system.
| Project/Area Number |
07404031
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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 | Tokyo Gakugei University (1996)
Keio University (1995) |
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Principal Investigator |
HONMA Hisahide Tokyo Gakugei Univ.Fac.Educ., Professor, 教育学部, 教授 (20091928)
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| Co-Investigator(Kenkyū-buntansha) |
MATSUNAMI Satosi Miyagi Univ.Educ.Fac.Educ., Assoc.Prof., 教育学部, 助教授 (50199824)
NAKATA Masataka Tokyo Gakugei Univ.Fac.Educ., Assoc.Prof., 教育学部, 助教授 (80180305)
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| Project Period (FY) |
1995 – 1996
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| Keywords | hydrothermal system / solution / ocean chemistry / enviromental change / reaction mechanism / isotopic ratio / Audissolution / bacteria |
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| Research Abstract |
The investigational results of this subject for 2years are summarized as follow :
・ Large carbon-dioxide flux in hydrothermal solutions and volcanic gases caused by superprume flows into atmospheric and seawater systems in cycles of a few ten to a hundred million years and gives the strong influences on meteorological and climatological variations and others.
・ Hydrothermal flux which seasater reacted with rocks in underground gives and is quantitatively assessed to strong influences on global seawater chemistry.
・ The formation mechanisms of replacement textures formed by the reactions of solution adn minerals are considered theoretically and experimentally in natural samples.
・ Based on the sulphur isotopic ratios fractionated in hydrothemal solutions and minerals from the vein-type and Kuroko type deposits, the getetical characteristics of both came clear.
・ Basalts from the back arc basin hydrothermal systems are characterized by the seawater/basalt mass ration and its chemical compositions.
・ It is carried out and assessed to the simulation studies in the disposal of high level radioactive substances.
・ Mg/ (Mg+Fe) ratios of carbonate altered zone over the Kuroko deposits and chlorites possitively correlate. And, isotopic rations of oxygen and carbon lie between the igneous and marine carbonate values. Based on the thermochemical calculations, this formation conditions are estimated.
・ The accumulations of gold and iron elements by bacteria were recognized in parts of the experimental systems in which auric complex ions were gradually added into the systems and limonite powders added.
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Research Products
(14 results)
