1997 Fiscal Year Final Research Report Summary
Alteration and weartering processes in the early terrestrial crust
| Project/Area Number |
08454152
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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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 | The University of Tokyo |
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Principal Investigator |
TAGAI Tokuhei Univ.of Tokyo, Graduate School of Sci., Assoc.Prof., 大学院・理学系研究科, 助教授 (40011738)
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| Co-Investigator(Kenkyū-buntansha) |
NAKASHIMA Satoru Univ.of Tokyo, Graduate School of Sci., Assoc.Prof., 大学院・理学系研究科, 助教授 (80237255)
MURAKAMI Takashi Univ.of Tokyo, Graduate School of Sci., Assoc.Prof., 大学院・理学系研究科, 助教授 (00253295)
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| Project Period (FY) |
1996 – 1997
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| Keywords | Plagioclase / Archean / Alteration / Weathering / Microtexture / Pyroxene / Olivine |
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| Research Abstract |
The materials of the terrestrial crust have contineously been weathered and altered by water since its formation. These phenomena are the most characteristic features of material evolution on the earth in the present solar system. However, the process of the weathering/alteration can not easily be traced because of the following volcanic, tectonic activities on the earth. We can see some products of the proteozoic alteration/weathering activities in the archean anorthosite complex in Superior Province, Canada. In order to simulate the proteozoic environment, we carried out the dissolution experiments on the single crystals of olivine, pyroxene and plagioclase, where the oriented thin specimens were used. Changing the experimental conditions (temperature, ph, time and orientation), the dissolution rate was measured and the surface of the reacted crystal was precisely observed. It can be concluded that the microtextures such as twinning or cleavage contribute very much on the dissolution rate and that the anisotropy of the crystal structure plays essential roll on the dissolution process.
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[Publications] Murakami, T., Isobe, H., Ohnuki, T., Sato, T., Yanase, N., Kiyoshige, J.: "Mechanism of saleeite formation at the Koongarra secondary ore deposit." Mat.Res.Soc.Symp.Proc.412. 809-816 (1996)
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[Publications] Ohnuki, T., Kozai, N., Isobe, H., Murakami, T., Yamamoto, S., Aoki, Y., Naramoto, H.: "Studies on sorption mechanism of europium by apatite using Rutherford backscattering spectroscopy and resonant uncleara reaction analysis." J.Nucl.Sci.Technol.34. 58-62 (1997)
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[Publications] Sto, T., Murakami, T., Yanase, N., Isobe, H., Payne, T.E., Airey, P.L.: "Iron nodules scavenging uranium from groundwater." Enviromental Science and Technology. 31. 2854-2858 (1997)
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