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Abstract
22
ORI OSHIMURA AEDA HIMURA
HKUMA GAWA ASHIZUME
OHARA ONDO AJISA
Mie Prefecture Environ-
Mie Prefecture Health and En-
vironment Research Institute, Sakura-cho, Yokkaichi , Japan.
Mie Prefectural Government, Department
of Environment and Forestry, Koumei-cho, Tsu , Japan.
mental Conservation Agency, Ueno, Kawage-cho, Tsu , Japan.
National Institute for
Environmental Studies, Onogawa, Tsukuba , Japan.
Graduate School of
Bioresources, Mie University, Kurimamachiya-cho, Tsu , Japan.
J. Hot Spring Sci.
During drilling a new bore-hole nearby an existing hot spring, Yunokuchi spa in
Kumano city, Mie Prefecture, the existing hot spring water was analyzed continuously
for investigation of geochemical influence by the drilling. The concentrations of chloride
and copper ions increased obviously accompanying the progress of drilling. It is esti-
mated that the anomalous increases of these ions are derived from the mixing of natural
groundwater containing higher concentration of chloride and copper ions. It is demon-
strated by natural field observation that an existing hot spring is obviously influenced by
a new drilling bore-hole close by. In the enforcement of The Hot spring law, it is thought
that the distance extent of geochemical influence observed in this study seems to be a
significant reference.
Key words : Yunokuchi spa, Kumano group, Drilling mud, Chloride ion, Copper ion
Yasunori M , Hideki Y , Akira M , Kyoko S ,
Kazuyuki O , Masahiko O , Kiyoshi H ,
Seiichi N , Masaaki K and Takamitsu K
Geochemical Influence of Drilling a New Hole
Adjacent to an Existing Hot Spring
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Fig. Geologic map of the area around the hot spring observed (Agency for Natural Resources
and Energy, Ministry of International Trade and Industry, ; Suzuki ).et al.,
24
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The major chemical composition of Yuno-
kuchi spa (Analyzed Data in May, )
Fig. Geologic column of the part of Kumano group (Agency for Natural Resources and Energy,
Ministry of International Trade and Industry, ).
Table
25
Concentration (mg/kg)
Cation Anion
Li F
Na Cl
K Br
Mg HCO
Ca CO
Sr
Mn
Water temperature .
pH . Yield L/min.
Table m
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: AS- mm AG- mm
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plus
Sr, Mn, Cu, Fe, Li : ICP
: YOKOGAWA HP-
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: SHIMADZU UV- A
:
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: . m
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Fig.
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. . pH . . L min.
Fig.
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Fig. Temporal variation in ion concentrations in the hot spring-water from an existing
Yunokuchi spa (Observation period ). Data Obtained before drilling a new bore-hole.
28
. mg kg
. mg
kg
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Fig. Drilling depth of a new bore-hole and temporal variation in ion concentrations in
the hot spring-water from an existing Yunokuchi spa (Observation period ). Drilling
depth is shown by a white bar graph.
29
Fig.
,
Meteoric Water Line MWL
Craig.
SMOW
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R RR
R D H
R O O
.
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0
+ ***
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Fig. Observed Zn concentrations at Yunokuchi spa. Dotted lines indicate the time
of exchange of air pipe containing Zn (Observation period ).
Fig. O- D-diagram of hot spring water from Yunokuchi spa.
30
D O
MWL
Fig.
+2
/
0
+22 +*
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31
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the drilling mud in this study
Table
32
Concentration (mg/kg)
Cl
Cu
pH .
Table
Fig.
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m m
. mg kg
. mg kg
. . mg kg
Table . mg kg
m
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,
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33
m, m
, m
m, m
m
2
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3** + -**
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34
, m m
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Chijiwa, K. and Tomita, S. ( b) : Sedimentary Environments of the Main Part of the Kumano
m
NNC
:
Craig, H. ( ) : Isotopic variations in meteoric waters. Science, , .
Chijiwa, K. and Tomita, S. ( a) : Stratigraphic notes on the Kumano Group (A study of the
Tertiary Formations of the Kumano Coal-field in the Kii Peninsula, Southwest Japan,
part ). Mem. Fac. Sci., Kyushu Univ., Ser. D, Geol., , .
Group (A study of the Tertiary Formations of the Kumano Coal-field in the Kii Peninsula,
Southwest Japan, part ). Mem. Fac. Sci., Kyushu Univ., Ser. D, Geol., , .
Chijiwa, K. and Tomita, S. ( ) : On the Onuma Formation of the Kumano Group (A study
of the Tertiary Formations of the Kumano Coal-field in the Kii Peninsula, Southwest
Japan, part ). Mem. Fac. Sci., Kyushu Univ., Ser. D, Geol., , .
: .
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