Abstract
Strontium isotopic ratios (strontium-87/strontium-86) of five barite samples from five Kuroko-type and vein-type ore deposits in Northeastern Japan and Southwestern Hokkaido were measured mass-spectrometrically. The values obtained are quite uniform, being in the narrow range between 0.7040 and 0.7044±0.0004. These values are extraordinarily low in comparison with the recent data for a number of sulfate minerals from Fukazawa and Kosaka Kuroko-type ore deposits (Farrell et al., 1978). It is suggested that the strontium isotopic level of Kuroko ore-forming solution might have in some cases lowered down almost exactly to that of Tertiary volcanic rocks depending possibly on the degree of interaction between the ore-forming solution of normal sea water origin and the volcanic rocks (Farrell et al., 1978).
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