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Fluid inclusions in quartz from the Inari copper vein group of the Ani mine, Akita prefecture were studied. The filling and freezing temperatures of fluid inclusions were measured in silicon oil cell of the dual-purpose device which was designed by authers and were found to be useful for both heating and freezing measurements of the same inclusion in a single set of operation. The heating rate was controlled by a program controller.<BR>To obtain relationship among the freezing temperature, heating rate and size of inclusion, the melting temperature of ice of distilled water enclosed in glass capillaries having various diameters were measured. The result show that the deviations from the true melting temperature of ice caused by various heating rates and sizes of inclusion, should not be ignored. In the present study, the heating rate was 0.3°C/min. in which the deviation of melting temperature is almost regardless of the size of inclusion.<BR>Filling temperatures of fluid inclusions in quartz and adularia from the ore veins, and in quartz from diorite and dacite, were within the range from 150°C to 300°C. These results agree approximately with those obtained from various vein type deposits in Japan. On the other hand, salinities of most inclusions were within the range from 18 to 22 weight percent NaCl equivalent concentration. With only one exception of vein of the Taishu mine, these highly saline inclusions are not yet reported in the vein-type deposits in Japan. It is assumed from the occurrence of highly saline inclusions in vein quartz and the geological setting of the Ani mine that the formation of ore solution were genetically related to the granitic rocks intruded into the Tertiary systems in the Ani mineralised area.
- 資源地質学会の論文
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