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Kosaka district

Figure 1.9. Available data on the Cu, Pb and Zn ratio of total ore in a single unit deposit in the Hanaoka-Kosaka district, marked with three sub-types of Kuroko deposits (Horikoshi and Shikazono, 1978). Figure 1.9. Available data on the Cu, Pb and Zn ratio of total ore in a single unit deposit in the Hanaoka-Kosaka district, marked with three sub-types of Kuroko deposits (Horikoshi and Shikazono, 1978).
Figure 1.12. Distribution of two different sub-types of Kuroko deposits in the Kosaka district, Akita Prefecture. Y sub-type deposits have not yet been discovered in the area. The top pre-Tertiary basement is contoured showing some depressed structures (Horikoshi and Shikazono, 1978). Figure 1.12. Distribution of two different sub-types of Kuroko deposits in the Kosaka district, Akita Prefecture. Y sub-type deposits have not yet been discovered in the area. The top pre-Tertiary basement is contoured showing some depressed structures (Horikoshi and Shikazono, 1978).
Figure 1.12 shows the areal distribution of the B and C sub-type deposits in the Kosaka district. The Y sub-type deposits have not yet been found in the district. It appears that two zones characterized by the distribution of each sub-type deposit are distributed north-southernly in the Kosaka district as well as in the Hanaoka district (Fig. 1.13). Pyroclastic rocks in the Kosaka formation, in which all deposits occur, become thicker to the east, and probably moved from the eruptive centres to the east (Horikoshi, 1969). These types of evidence may indicate that the sea at that time became deeper to the east. Figure 1.12 shows also the top of the pre-Tertiary basements. Ore deposits, either B or C sub-type, occur above the crater-like depressions of basements. The Shinsawa deposit is the sole example of B sub-type in the midst of the Hanaoka-Kosaka district, so-called Hokuroku basin (Fig. 1.13). The Tsunokakezawa deposit in the Fukazawa mine and ore deposit in the Ezuri mine are also the B sub-type. Figure 1.12 shows the areal distribution of the B and C sub-type deposits in the Kosaka district. The Y sub-type deposits have not yet been found in the district. It appears that two zones characterized by the distribution of each sub-type deposit are distributed north-southernly in the Kosaka district as well as in the Hanaoka district (Fig. 1.13). Pyroclastic rocks in the Kosaka formation, in which all deposits occur, become thicker to the east, and probably moved from the eruptive centres to the east (Horikoshi, 1969). These types of evidence may indicate that the sea at that time became deeper to the east. Figure 1.12 shows also the top of the pre-Tertiary basements. Ore deposits, either B or C sub-type, occur above the crater-like depressions of basements. The Shinsawa deposit is the sole example of B sub-type in the midst of the Hanaoka-Kosaka district, so-called Hokuroku basin (Fig. 1.13). The Tsunokakezawa deposit in the Fukazawa mine and ore deposit in the Ezuri mine are also the B sub-type.
Sulfur isotopic data of separated pyrite as the commonest sulfide mineral (Kajiwara, 1971 Kajiwara and Date, 1971) show different values for the three sub-types of Horikoshi and Shikazono (1978). The values of pyrite in the C sub-type deposits are higher than the values of pyrite from the Y and B sub-types. The values of pyrite from the Y sub-type seem to be slightly higher than those from the B sub-type. Kajiwara and Date (1971) are of a different opinion the values from the Kosaka district are higher than those in the Hanaoka district, because all sulfur isotopic data from the C sub-type were obtained in the Kosaka district. The sulfur isotopic data on the obtained Uwamuki deposits of the B sub-type in the Hanaoka district indicate systematic decrease in 8 S passing from the yellow ore (4-7%o) to the black siliceous ore (4-5%c) (Bryndzia et al., 1983). Kajiwara and Date s data (1971) include three values of pyrite in the Doyashiki deposit of C sub-type in the Hanaoka district. The main Doyashiki... [Pg.53]

Horikoshi, E. (1969) Volcanic activity related to the formation of the Kuroko-type deposits in the Kosaka district, Japan. Mineralium Deposits, 4, 321—345. [Pg.274]

Figure 1.9 shows the proportion of Cu, Zn and Pb contents of Kuroko ore (Tatsumi and Ohshima, 1966 Horikoshi and Shikazono, 1978). Horikoshi and Shikazono (1978) divided Kuroko deposits in the Hanaoka-Kosaka area of Hokuroku district into three sub-types based on the ratio of Cu to Pb and Zn which increases in order of the B (black ore), C (composite ore), and Y (yellow ore) sub-types (Fig. 1.9). Characteristic features of these three sub-types were summarized by Horikoshi and Shikazono (1978) and are briefly decribed below. Figure 1.9 shows the proportion of Cu, Zn and Pb contents of Kuroko ore (Tatsumi and Ohshima, 1966 Horikoshi and Shikazono, 1978). Horikoshi and Shikazono (1978) divided Kuroko deposits in the Hanaoka-Kosaka area of Hokuroku district into three sub-types based on the ratio of Cu to Pb and Zn which increases in order of the B (black ore), C (composite ore), and Y (yellow ore) sub-types (Fig. 1.9). Characteristic features of these three sub-types were summarized by Horikoshi and Shikazono (1978) and are briefly decribed below.
Figure 1.44. Isotopic composition of lead in black ore (open symbols) and in yellow ore (closed symbols) in the Hokuroku district. The isotopic fields for black ore from the Fukazawa, Shakanai, and Kosaka deposits are... Figure 1.44. Isotopic composition of lead in black ore (open symbols) and in yellow ore (closed symbols) in the Hokuroku district. The isotopic fields for black ore from the Fukazawa, Shakanai, and Kosaka deposits are...
Bryndzia, L.T., Scott, S.D. and Farr, J.E. (1983) Mineralogy, geochemistry, and mineral chemistry of siliceous ore and altered footwall rocks in the Uwamuki 2 and 4 deposits, Kosaka mine, Hokuroku district, Japan. Econ. GeoL Mon., 5, 507-522. [Pg.269]

Green, G.R., Ohmoto, H., Date, J. and Takahashi, T. (1983) Whole-rock oxygen isotope distribution in the Fukazawa-Kosaka area, Hokuroku district, Japan, and its potential application to mineral exploration. Econ. Geol. Mon., 5, 395—411. [Pg.272]

Horii, K. (1971) A study on Kosaka Uwamuki deposits. Graduation Thesis, Hokkaido U. (in Japanese). Horikoshi, E. (1960) The stratigraphical horizon of the Kuroko deposits in Hanaoka-Kosaka area. Green Tuff district of Japan. Mining Geology, 10, 300-310 (in Japanese). [Pg.274]

See also in sourсe #XX -- [ Pg.21 , Pg.22 , Pg.53 ]



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