岩石鉱物鉱床学会誌

鳥取県多里地方のクロム鉄鉱と産状に関する研究(第1報)(I)

北原順一

1958 年 42 巻 1 号 p. 1-9
発行日: 1958/02/01
公開日: 2008/08/07

DOIhttps://doi.org/10.2465/ganko1941.42.1

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The Tari district is situated at about 43km southeast of Matsue city. The geological map of this district surveyed by the writer is shown in Figure 1. The Paleozoic sediments were intruded by chromite bearing ultra-basic rocks. As the chromites are always associated with serpentinized olivine or enstatite, the assumption is rejected that these chromites were originated from hydrothermal liquid. The size of disseminated chromite is 0.3 to 0.5mm. In thin section, the disseminated chromite has generally black margin and the massive chromite is commonly brownish yellow in color. The chromite is enriched in iron oxide and the serpentinite is relatively iron poor. The black materials of chromite are presumably ferrian chromite or chromian magnetite. The chromite from the deposite in the region is comparatively higher in MgO and Al₂O₃ contents, and it is lower in Cr₂O₃ than those from other areas in Japan. The content of FeO+Fe₂O₃ in disseminated chromite which is related to serpentinite is generally higher than that of massive chromite and has a reverse relation to that in green to yellow serpentinite. The disseminated chromites in the leuchtenbergite rocks, which are rich in A1₂O₃ content and poor in FeO+Fe₂O₃, are poor in A1₂O₃ and rich in FeO+Fe₂O₃.

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石油母岩の研究(第2報)

八橋油田・高野R113号井コーアの無機微量成分について

加藤磐雄, 阿部正宏

1958 年 42 巻 1 号 p. 9-15
発行日: 1958/02/01
公開日: 2008/08/07

DOIhttps://doi.org/10.2465/ganko1941.42.9

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豊羽鉱山における赤鉄鉱および磁鉄鉱の産状について

藤原哲夫, 斎藤昌之

1958 年 42 巻 1 号 p. 15-22
発行日: 1958/02/01
公開日: 2008/08/07

DOIhttps://doi.org/10.2465/ganko1941.42.15

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The Toyoha mine situated at about 30km southwest of Sapporo city, is working on epithermal vein systems which occur along some shearing and tensile cracks in green tuff, propylite and black shale of the Miocene series. The ore veins carry abundantly galena, sphalerite, pyrite and quartz and lesser amount of rhodochrosite. A little hematite and magnetite are detected in the lower part of these veins. In this paper, genesis of the iron oxides in the epithermal vein is discussed.

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柵原鉱山黄鉄鉱々体にみられる石英斑岩々脈の影響

東元定夫

1958 年 42 巻 1 号 p. 22-31
発行日: 1958/02/01
公開日: 2008/08/07

DOIhttps://doi.org/10.2465/ganko1941.42.22

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The thermoelectric effect of pyrite from copper deposits in Japan is mainly discussed. Prof. Smith measured the thermoelectric potential of pyrite specimens from many localities and as a result, and deduced that there are some qualitative relations between the thermoelectric potential and the temperature at which they are formed. A.D. Mutch reported that the value for the temperature of formation obtained by the pyrite geothermometer, appears to be reasonable and in relations to geological problem, to vary in the right sense. The writer measured the thermopotential of pyrite from many localities in Japan by Smith's method and discussed. The conclusion is reached that these results differ somewhat from those mentioned by F.G. Smith and it seems to be difficult to expect qualitative difference in thermoelectric potential for indication of the temperature of ore deposition.

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日本の銅鉱床に伴う黄鉄鉱の熱電効果

武中俊三

1958 年 42 巻 1 号 p. 31-38
発行日: 1958/02/01
公開日: 2008/08/07

DOIhttps://doi.org/10.2465/ganko1941.42.31

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The thermoelectric effect of pyrite from copper deposits in Japan is mainly discussed. Prof. Smith measured the thermoelectric potential of pyrite specimens from many localities and as a result, and deduced that there are some qualitative relations between the thermoelectric potential and the temperature at which they are formed. A. D. Mutch reported that the value for the temperature of formation obtained by the pyrite geothermometer, appears to be reasonable and in relations to geological problem, to vary in the right sense. The writer measured the thermopotential of pyrite from many localities in Japan by Smith's method and discussed. The conclusion is reached that these results differ somewhat from those mentioned by F. G. Smith and it seems to be difficult to expect qualitative difference in thermoelectric potential for indication of the temperature of ore deposition.

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北部北上山地岩泉附近の接觸変成岩類(II)

加納博

1958 年 42 巻 1 号 p. 38-45
発行日: 1958/02/01
公開日: 2008/08/07

DOIhttps://doi.org/10.2465/ganko1941.42.38

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所謂万年山熔岩の岩石化学的研究

松本幡郎

1958 年 42 巻 1 号 p. 45-50
発行日: 1958/02/01
公開日: 2008/08/07

DOIhttps://doi.org/10.2465/ganko1941.42.45

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So-called “Haneyama-lavas”, as named by T. Matsumoto, are widely distributed in central Kyushu, especially in Oita Prefecture. These lavas are mostly glassy and their texture shows various types, namely, spherulitic, fluidal and perlitic. Phenocrysts are plagioclase (An 27-45%) and sporadic mafic minerals.
Their chemical compositions are shown in Table 1 and their normative compositions in Table 3. As compared with the average chemical compositions of Japanese volcanic rocks, the Haneyama lavas are rich in alkalies, and poor in CaO, FeO and MgO. Normative feldspars are rich in Or and Ab, and poor in An. Wo is always absent.
Chemical compositions and norm of spherulitic rock and spherulite in Haneyama lavas are shown in Table 5. Compared with the host rock, the spherulite is rich in SiO₂, FeO, CaO and especially alkalies and the composition lies near the eutectic line between quartz and alkali feldspar.

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