Replacement Texture and Mechanism of Metasomatism.

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  • 交代組織と交代作用のメカニズム
  • コウタイ ソシキ ト コウタイ サヨウ ノ メカニズム

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Abstract

Rim replacement texture is commonly observed in hydrothermal ore deposits. Examples are replacements of native bismuth by bismuthinite, ferberite by scheelite, galena by sphalerite and cassiterite by stannoidite and stannite. There are three main rate-determining mechanisms of replacement. They are surface reaction, diffusion in boundary layer and diffusion in altered layer. Theoretical considerations on these mechanisms indicate that the variations in the amount of altered product with time for each mechanism are different. Experimental study on the reaction of electrum and NaHS and Na2S solutions at 150°C by Nakata et al. (1994)(Resource Geol., 44, 395-407) demonstrated that surface reaction is rate determining mechanism for the formation of Ag2S which is the product of the reaction between electrum and NaHS solution. Such replacement experiments are necessary to clarify the mechanism of replacement and metasomatism.

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