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Interpretation of Annual Variations of Rare Earth Element
Concentrations in Tamagawa Hot Spring Watersin Akita Prefecture of Japan by Leaching
Experiment of Andesitic Rock
Tetsuya SANADA+2, Nobuki TAKAMATSU,2, Yuzo YOSHIIKE,2,
Masayuki IMAHASHI,2 and Hideo HIGUCHI-2+

Graduate school of Science, Toho University,
Faculty of Science, Toho University
Japan Chemical Analysis Center

Abstract
Leaching experiments were made using andesitic rock and dilute sulfuric acid in an
attempt to explain the relationship between rare earth elements (REE) concentration andSO.,3/Cl3 ratio in the Tamagawa hot spring water. The powdered rock was separated
into two mineral groups using an isodynamic separator in an e#ort to elucidate the REE
leaching behavior. The REE patterns of the felsic mineral group exhibited a positive Eu
anomaly, in contrast to the slightly negative Eu anomaly of the whole rock and the maﬁc
mineral group. The leaching experiments revealed that REE leaching was much lower
for the felsic mineral group than for the maﬁc mineral group, although the rate of REE
leaching in the former case was higher. It was also found that the rate of leaching forlight REEs from the andesitic rock was larger than for heavy REEs, which is consistent
with the analytical results for the hot spring water. It was concluded based on theseresults that the high REE concentrations of the Obuki Hot Spring water are due tointeraction between the local rock and water containing high concentrations of SO.,3.
Key words : Tamagawa Hot Spring, rare earth elements, hot spring water, water-rockinteraction, geochemistry456 : 789: ;<=>? 9:@ @ῌABCDEF GH 

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Location of Tamagawa hot spring in Akita prefecture, Japan.

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Fig. , Annual variations of rare earth element (REE), SO.,E and ClE concentrations in Tamagawa hot
spring waters (Sanada, et al., ,**,).

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Fig. . Chondrite normalized abundances (REE patterns) of whole rock, maﬁc mineral and felsic mineralgroups separated by an isodynamic separator.

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Fig. / Leaching rates of REE during the experiments.
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Fig. 0 Chondrite normalized abundances (REE patterns) in the solutions during the leaching experiments.
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Craig, H. (+30-) : The isotopic geochemistry of water and carbon in geothermal areas. Nuclear
Geological Geothermal Areas, edited by E. Tongiorgi, +1῍/-.
Higuchi, H. and Nagasawa, H. (+303) : Partition of trace elements between rock-forming
minerals and the host volcanic rocks, Earth Planet. Sci. Lett., 1, ,2+῍,21.

#$#% &+313' : ()*+,-./012 )*3.2 -*2 +*.῍++1.
45672 89:;2 <=>?2 @A:B2 CDEF &+33.' : Rb GH Cs IJKLMNO)*PQR+STUVWXY2 )*3.2 ..2 +2-῍+32.
Kikawada, Y., Oi, T., Ossaka, T., Kakihana, H. and Honda, T. (+33/) : Leaching of lanthanoids
from andesitic rocks by acidic aqueous solutions, Geochemical Journal, ,3, 01῍2..
Matsubaya, O., Sakai, H., Kusachi,I. and Satake, H. (+31-) : Hydrogen and oxygen isotopic
ratios and major element chemistry of Japanese thermal water system, Geochemical
Journal, 1, +,-῍+/+.

Z[\2 ]^_`2 a b? &+3/3' : ()*c d #e-./GHfg./h- &i?jklmnopqr#' ()*st01u 0 v2 p. -῍1.
wxyz2 {x|} &+333' : #e. ῌ#e~2 0῍22  2 2   &+33-' : #e~h XY2 -.2 -2,/+῍,/2.
Packter, A. and Dhillon, H.S. (+303) : The heterogeneous of gibbsite powder with aqueous
inorganic acid solutions ; kinetics and mechanism, J. Chem. Soc., A, ,/22῍,/3,.
Sakai, H. and Matsubaya, O. (+31.) : Isotopic geochemistry of the thermal waters of Japan andits bearing on the Kuroko ore solutions, Economic Geology, 03, 31.῍33+.

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