Abstract
Carbonates from the Neogene epithermal vein-type deposits in Japan can be divided into two types: type A which precipitated abundantly at the main stage of mineralization and type B which precipitated in small amounts at a later stage. δ 18O-values of type- A carbonate (0 to + 14‰) are lower than those of type- B carbonate (+5 to +24‰). Estimated δ 18O-values of type- A and - B ore fluids are − 10 to 0‰ and 0 to + 10 ‰, respectively. δ 18O of type-A carbonate can be explained by meteoric water-rock interaction but that of type- B carbonate cannot be explained by this process. Rayleigh-type boiling could account for the relatively high δ 18O of type- B carbonate.
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