Journal of Geology & Geophysics
Open Access

Yokoyama T

Publications

• Research Article
  Rare Earth Elements and Sr-Nd-Pb Isotopic Analyses of the Arima Hot Spring Waters, Southwest Japan: Implications for Origin of the Arima-type Brine
  Author(s): Nakamura H, Fujita Y, Nakai S, Yokoyama T and Iwamori H Nakamura H, Fujita Y, Nakai S, Yokoyama T and Iwamori H
  
  Rare earth elements (REEs) and Sr-Nd-Pb isotopic compsotions of the Arima hot spring waters, a specific type of deep-seated brine (up to 6 wt.% NaCl) in the non-volcanic fore-arc region of southwest Japan, have been analyzed in order to discuss their source materials and origins. We have first examined the matrix effect associated with variable salinity (0 to 5 wt.% NaCl), and found that above 1 wt.% NaCl, the intensity of REE in ICP-MS measurement is drastically reduced due to the matrix effect. Accordingly, we have diluted the sample waters to contain ~0.6 wt.% NaCl, and then analyzed them by the standard addition method. The result shows that the abundance is appreciably high compared to near-surface waters, and exhibits almost a flat DMM-normalized pattern, which can be explained by mixing of a slab-derived fluid at relatively low temparature (400 to 500ºC) and a near-surface.. View More»
  DOI: 10.4172/2329-6755.1000161

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