1988 Fiscal Year Final Research Report Summary
Phase relations of the Cu-Fe-S system at low temperatures.
| Project/Area Number |
62540622
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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 |
鉱物学(含岩石・鉱床学)
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| Research Institution | HIROSHIMA UNIVERSITY |
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Principal Investigator |
TAKENO Setsuo Faculty of Science, Hiroshima University : Professor, 理学部, 教授 (00033829)
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| Co-Investigator(Kenkyū-buntansha) |
KITAGAWA Ryuji Faculty of Science, Hiroshima University : Assistant, 理学部, 助手 (70112167)
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| Project Period (FY) |
1987 – 1988
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| Keywords | Plasma-tourch experiment / Phase relation / Cu-Fe-S system / Bornite / Mackinawite / Pyrrhotite / Chalcopyrite / Cu-Fe-S系 |
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| Research Abstract |
The system Cu-Fe-S includes various kind of minerals and the phase relations and/or stability relations of these minerals are very complicated, especially at low temperatures. The present invcstigation was carried out mainly concerning the following three porblems;
1. Bornite-pyrrhotite assemblage: This mineral assemblage long been believed as antipathic. However, during the course of Plasma-tourch melting experiments, bornite-pyrrhotite assemblage was always formed from the starting compositions between chalcopyrite and cubanite. The existence of bornite-pyrrhotite tie line conflicts with the common assmblages of mackinawite-chalcopyrite and mackinawite-cubanite. Phase relations related to the stability of bornite-pyrrhotite the line were discussed based on the experimental results as well as the results in the previous literatures.
2. Abnormal d(102) value of hexagonal pyrrhotite: In melting experiments of sulfides using the Plasma-tourch furnace, the author has found that some of hexagonal pyrrhotite have abnormal d(102) value. The compositions of the pyrrhotite determined by the X-ray spacing method as well as by EPMA analysis are cleary iron rich than that of stoichiometric FeS. Significance of this phase in the Cu-Fe-S system in relation to the stability of mackinawite wsa already reported (in press).
3. Growth conditions and crystal chemistry of pyrite: Euhedral crystals of pyrite from the Yoshida ore deposit, Hikawa mine were investigated. Growth patterns developed on (100) surface were discussed in relation to the dgree of supersaturation. Minor element concentrations were examined and based on the results obtained, formation mechanism of the pyrite crystals were discussed.
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