Abstract
Takahashi et al. (2002) have determined the rare earth element (REE) concentrations of weathered granite and related groundwater samples from the Tono area, central Japan. The chondrite-normalized REE distribution patterns of rock and water samples were found to exhibit the lanthanide tetrad effect. The REE distribution patterns of the weathered granite were typified by a convex (M-shaped) tetrad effect, whereas the groundwater samples showed lanthanide distribution patterns with a concave (W-shaped) tetrad effect. Based on this observation, it was suggested that the M-shaped tetrad effect of the granite primarily represents a residual REE pattern resulting from the extraction of a mirroring W-shaped tetrad effect by the groundwater. This interpretation was further substantiated by the observation that sedimentary rocks in the Tono area show REE distribution patterns with a W-shaped tetrad effect implying that fixation of groundwater REE onto the sedimentary rocks was significant. Takahashi et al. (2002) suggested that the size of the tetrad effect in the REE distribution patterns of
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