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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

Nakamura H1,3*, Fujita Y3, Nakai S2, Yokoyama T3 and Iwamori H1,3
1Japan Marine Science and Technology Center, 2-15 Natsushima-cho, Yokosuka-shi, Kanagawa 237-0061, Japan
2Earthquake Research Institute, University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo, Japan
3Department of Earth and Planetary Sciences, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8551, Japan
*Corresponding Author : Hitomi Nakamura
Japan Marine Science and Technology Center
2-15 Natsushima-cho, Yokosuka-shi
Kanagawa 237-0061, Japan
Tel:+81-46-867-9764
Fax: +81-46-867-9625
E-mail: [email protected]
Received April 23, 2014; Accepted June 23, 2014; Published June 27, 2014
Citation: Nakamura H, Fujita Y, Nakai S, Yokoyama T, Iwamori H (2014) 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. J Geol Geosci 3:161. doi:10.4172/2329-6755.1000161
Copyright: © 2014 Nakamura H, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited

Abstract

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 water. The Sr-Nd- Pb isotopic compositions of the brineare consistent with the above interpretation on REEs, in that the deep brine is isotopically similar to a slab-derived fluid of the subducted Philippine Sea slab. These evidences suggest that the slabderived fluid is upwelling even in the non-volcanic region possibly through a fault zone along the tectonic line.

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