Journal of Geology & Geophysics
Open Access

Kotona Chiba

Publications

• Research Article
  Origin of the Arima-type and Associated Spring Waters in the Kinki District, Southwest Japan
  Author(s): Hitomi Nakamura, Kotona Chiba, Qing Chang, Noritoshi Morikawa, Kohei Kazahaya and Hikaru Iwamori Hitomi Nakamura, Kotona Chiba, Qing Chang, Noritoshi Morikawa, Kohei Kazahaya and Hikaru Iwamori
  
  Rare earth elements (REEs) of the spring waters upwelling in the non-volcanic fore-arc region of the Kinki district in southwest Japan were investigated to assess their upwelling processes and deep-seated origins. A principal component analysis of the REE data identified three principal components (PCs) that cover 89% of the entire sample variance: (1) PC-01, which corresponds to a dilution process by which fluids are introduced at low concentrations, previously represented by major solute binary trends, including δ18O–δD systematics; (2) PC-02, which is a precipitation process of REEs from the brine; and (3) PC-03, which is an incorporation of REEs from country rock by carbonic acidity, although the types of country rocks may also have a significant impact on the spring water compositions. Based on these three PCs, together with the major solute concentrations and h.. View More»
  DOI: 10.4172/2381-8719.1000240

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