| Co-Investigator(Kenkyū-buntansha) |
KUSUDA Hiromu Faculty of Eng., Kyoto Univ.,Instructor, 工学部, 助手 (90169988)
NISHIYAMA Takashi Faculty of Eng., Kyoto Univ., Lecturer, 工学部, 講師 (70026227)
SATO Juichi Faculty of Eng., Hokkaido Univ., Professor, 工学部, 教授 (70001245)
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| Budget Amount *help |
¥3,100,000 (Direct Cost: ¥3,100,000)
Fiscal Year 1986: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1985: ¥2,600,000 (Direct Cost: ¥2,600,000)
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| Research Abstract |
The amounts of the minor elements - Ag, Mn, Cd, Ni, Co, In, Cr, Bi, Sb, As, Fe, Pb, Cu - have been determined quantitatively by the atomic absorption analysis in order to examine the concentration and distribution of the minor elements in the coexisting ore minerals. The analyzed mineral samples - sphalerite, galena, pyrite, chalcopyrite, pyrrhotite, arsenopyrite, magnetite, rhodochrosite - were collected from the following eight ore deposits, Shakanai, Shimokawa, Broken Hill, Kamioka, Chichibu, Toyoha, Ohe and Mamut. Most of the analytical results have been obtained through the studies on the minor elements in rocks and minerals during late decade.
Some remarkable distribution and correlation coefficients of the minor elements between coexisting ore minerals have been determined on the basis of these analytical results.
Using the distribution coefficients of manganese and cadmium between coexisting sphalerite and galena, the formation temperatures of the Shakanai, Kamioka, Toyoha and Ohe ore deposits have been calculated. All of the calculated values are considerably higher as compared with the formation temperatures estimated with fluid inclusion or sulfur isotope. In regard to the principal reason why there are considerable differences between both the estimated formation temperatures, it may be inferred that the coexisting shalerites and galenas in the ore deposits do not yet attain to equilibria.
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