Geochemical Influence of Drilling a New Hole Adjacent to an Existing Hot Spring

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1 J. Hot Spring Sci. 0*,, -0,*+* , -. / /,,, /,, / ++ Geochemical Influence of Drilling a New Hole Adjacent to an Existing Hot Spring Yasunori M ORI, Hideki Y OSHIMURA, Akira M AEDA, Kyoko S HIMURA, +, - Kazuyuki O HKUMA, Masahiko O GAWA, Kiyoshi H ASHIZUME,. / / Seiichi N OHARA, Masaaki KONDO and Takamitsu KAJISA Abstract 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 estimated 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 demonstrated 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 /+, +, Mie Prefecture Health and Environment Research Institute, Sakura-cho, Yokkaichi /+, +,++, Japan. /+. 2/1* +- Mie Prefectural Government, Department of Environment and Forestry, +- Koumei-cho, Tsu /+. 2/1*, Japan. /+* *-*. -,/2 Mie Prefecture Environmental Conservation Agency, -,/2 Ueno, Kawage-cho, Tsu /+* *-*., Japan. -*/ 2/*0 +0, National Institute for Environmental Studies, +0, Onogawa, Tsukuba -*/ 2/*0, Japan. /+. 2/*1 +/11 Graduate School of Bioresources, Mie University, +/11 Kurimamachiya-cho, Tsu /+. 2/*1, Japan. + +,, / / 22

2 0*,*+* : + -,**0 2 -+,**0 +*,**0,**1 ;,**2,**3.,/ +,*** m 23

3 ,**1,,+ +3/2 ; +30+ ; ; +301 ; +31, ; Chijiwa and Tomita, +32+ a, +32+ b, +32/ +-**, m Fig. + Fig., * ; +32, +,,. 11 m +,,*,.*/ m +,-**.-* m +32, +32* +33* /.0.,,-* L, ph 1. 2 Fig. + Geologic map of the area around the hot spring observed (Agency for Natural Resources and Energy, Ministry of International Trade and Industry, +313 ; Suzuki et al., +32, ). 24

4 0*,*+* Fig., Geologic column of the part of Kumano group (Agency for Natural Resources and Energy, Ministry of International Trade and Industry, +32* ). Table + The major chemical composition of Yunokuchi spa (Analyzed Data in May, +33* ) Table + 3** m Concentration (mg/kg) 3** Cation Anion +,-** m Li,4+ F,43 Na.1*4- Cl +-/1 K 042 Br.41, Mg 34* HCO-,, Ca -/+4. CO *4-, Sr.43 -, Mn *4- Water temperature.0., -/ m +,.** m ph 1. 2 Yield,-* L/min. 25

5 ,,,**2,., : :,**0 2,**1, 1 : + + : :,**1 +*,**2 0 3 : +,,,*+* -,-,**, ph : : Sartorius PT-+* : Na, Ca, Mg, K : : SHIMADZU AA-02** : Air-C H,, :HCl F, Br, SO : : DIONEX DX-+,* : AS-+..,/* mm AG-+.. /* mm : ASRS-**. mm : -/. mmoll Na CO +*. mmoll NaHCO : *./. mm Cl : : ++* N AgNO / KCrO 26.,. -, - -

6 0*,*+* Sr, Mn, Cu, Fe, Li : ICP : YOKOGAWA HP-./** :HNO HBO : ICP, - : SHIMADZU ICPS-2+** :,**, H SiO :, - : SHIMADZU UV-,,** A :,**, : plus : Thermo Fisher Scientificmodel DELTA XL : *./. mm : SMOW Standard Mean Oceanic Water,,**1 +,**2 + /,**2, -., 0 +,**2 2 2 *./. mm ICP Cl : : DIONEX DX-+,* : AS-,-.,/* mm AG-,-. /* mm : ASRS-**. mm :./. mmoll Na CO */. mmoll NaHCO, - - : *./. mm - Fig. - Fig.. Fig. -, Fig...,. 3.../ ph * +.* Lmin. -+ : Fig. / 27

7 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. *+. mgkg *3. mg kg Fig. / -, 28

8 0*,*+* 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. d Fig. 0 d RRSMOW d +,*** R SMOW RDH R O O d Meteoric Water Line MWL Craig

9 Fig. / Observed Zn concentrations at Yunokuchi spa. Dotted lines indicate the time of exchange of air pipe containing Zn (Observation period ). Fig d O-dD-diagram of hot spring water from Yunokuchi spa. +2 dd2 d O+* MWL ,**3 Fig. 1 30

10 0*,*+* Fig. 1 Observed Cl concentrations at Yunokuchi spa during drilling at adjacent site (Observation period ). +,-/* mgkg /** m +-/*, mgkg +,.-* mgkg,**2 0 +,--* +,.+* mgkg +,.-* mgkg --,,*** 31

11 , Table, Chemical compositions of the drilling mud in this study Concentration (mg/kg) Cl,*42 Table, Cu ph 31. *4*++ -. Fig. 2 *.**0 *.**1 mgkg 1** m 20* m, *.*+- mgkg **+*. mgkg,**2 0 *.*+* *.*+- mgkg Table, *.*++ mgkg +** m +32, -/ Fig. 3 32

12 0*,*+* Fig. 2 Observed Cu concentrations at Yunokuchi spa during drilling at adjacent site (Observation period ). /** m, 1** m 3** +,-** m.** m,,** m,**.** m 33

13 Fig. 3 The model of geochemical influence of existing hot spring by the drilling.. +,-** m -/ m /** m +,-/* mg kg +.-*, mgkg 1** m, *.*+- mgkg 34

14 0*,*+*,**.** m NNC +301 : +1 +,+ +,2 Craig, H. ( +30+ ) : Isotopic variations in meteoric waters. Science, +--, +1*, +1*-. Chijiwa, K. and Tomita, S. ( +32+ 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.,,., +// +12. Chijiwa, K. and Tomita, S. ( +32+ b) : Sedimentary Environments of the Main Part 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.,,.,,2+,31. Chijiwa, K. and Tomita, S. ( +32/ ) : 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.,,/,,2+,31.,**, :,**, ,**0 :,**0 +*

15 ,**3 :,**3 - + /1.,**1 : - /1 +.*.,*** :,1 0* 1+.,**3 : 0,, : : +3, :,+ +/* : , :,, ,**2 : 0+,/. +3/2 : 2 +,/ , : -, + // 0/ : /0. +32* : ,-.,**1 : ,**2 3,/ 0+ 36

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