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1 No.50 pp , 2014 Komazawa Journal of Geography Origin and Geochemistry of a Flowing Confined Groundwater at the Northern Foot of Mt. Iwate, Northeast Japan SUZUKI Hidekazu and TASE Norio Ca-HCO 3 Ca-SO 4 Ca- SO 4 HCO 3 Cl Ca-HCO 3 Ca-SO y d-excess D 8 18 O d-excess d- excess d-excess 16.8 Keywords: Mt. Iwate, Hachimantai, groundwater chemistry, isotopic ratio, mixing 1992 Yamamoto, SO 2 4 Cl 101

2 He / 4 He He 1 55m km km km km

3 A1 Spring Well River S3 R.Aka Measurement site of River discharge S1 S2 A2 G2 Kashiwadai R.Gotou R1 S4 G4 G3 Load S5 River channel S7 Kanazawa S8 R.Matsu S m Hachimantai S9 S10 R2 R. Kita nomata R. Kakkonda R3 S15 R4 S12 G5 R5 S14 R6 S32 R.Yakegiri S13 R. Matsu 500 R. Aka R7 S16 S Mt. Iwate S30 S24 S31 S25 S29 S28 S26 S27 S23 S20 S22 S18 S19 S21 Spring Well River R. Kitakami 0 5km

4 1 5km ph Model PH 81 ph Model SC 82 EC Na K Ca 2 Mg 2 ICP Jarrel-Ash ICAP-757/757V Cl NO 3 SO 2 4 Yokogawa, IC-100 HCO 3 MR-BCG ph4.8 1/100N CO 2 H 2 Finnigan Mat Thermo Fisher Scientifi MAT252 V-SMOW D 1 18 O A1 A2 m 3 /sec m 2 m/sec CR Cl R2 Ca-HCO 3 Ca-SO 4 2 Ca-HCO 3 S16 S32 Ca-SO 4 R7 Ca-SO 4 Ca-SO 4 104

5 No. Date WT ph EC Na + K + Ca 2 Mg 2+ Cl HCO 3 SO 2 4 NO 3 18 O D d excess chemical yy mm dd μs/cm mg/l mg/l mg/l mg/l mg/l mg/l mg/l mg/l type Ca SO G Ca SO 4 G Main study area G S Ca SO S Ca SO S S S S6 Ca HCO Hchimantai area (north area of R.Matsu) S S R Ca SO 4 G S S S S S S Ca SO4 R Ca Cl R Ca SO 4 R Ca SO 4 R Ca SO 4 S Ca SO 4 S S Iwate volcano area (South area of R.Matsu) S S S S S S S S S S S S S S Ca SO 4 R Ca SO 4 R Ca SO 4 Goshiki-numa* Ca SO 4 * Lake bottom spring water of Matsuo Goshiki numa (data from Yoshida et al., 1978) 105

6 R4 Ca-SO 4 Ca-HCO 3 2 S3 S1 S2 G2 R.Aka Kashiwadai meq/l meq/l Na + +K + Cl - Ca 2+ - HCO 3 Mg SO 4 (+NO - 3 ) HCO - 3 type SO 2+ 4 type R.Gotou R1 R.Matsu S6 G3 G4 S7 S8 Kanazawa S5 S m Hachimantai S9 S10 R. Kitanomata S15 R6 R2 R. Kakkonda R3 R5 S14 S16 S32 S31 S28 R4 S12 RẎakegiri R7 S30 S29 S13 R. Matsu 500 R. Aka G5 S Mt. Iwate S27 S24 S25 S23 S33 S26 Lake Goshiki-numa (Yoshida et al., 1978) meq/l S20 S22 S18 S19 S21 R. Kitakami 0 5km 2 Ca-HCO 3 Ca-SO 4 106

7 Ca-HCO 3 Ca-SO 4 HCO 3 SO 4 Ca-SO 4 Ca-SO 4 HCO 3 Cl μS/cm 3 D 18 O - y d-excess D 8 18 O d d-excess 2009 S16 d-excess 18 O ( ) Local origin in the southeastern foot of Hachimantai volcanic group -60 D = 8 18 O+25 G2 S2 S16 S1 G5 S4 G3 D = 8 18 O D ( ) Northern area of R. Matsu (Hachimantai) Northern area of R. Matsu (Iwate) Eastern slope of Iwate volcano

8 catchment area km 2 flow rate m 3 /sec specific discharge m 3 / sec / km 2 upstream (A1) downstream (A2) S1 S4 G5 d-excess HCO 3 SO 4 3 ph4 ph 3.3 EC 1245μS/cm SO mg /L SO 4 R1 Ca-SO 4 1 A1 1 A m 3 /sec 1.12m 3 /sec 0.05 m 3 /sec/km m 3 /sec/km 2 Ca-HCO 3 55m Ca-SO 4 Ca-SO 4 HCO 3 Cl 2 Ca-HCO 3 Ca-SO 4 G3 108

9 G3 S2 Cl X X IG f IG X HG 1 f IG 1 X IG X HG X IG HG X f IG X IG X HG 4 f IG 0.7 G / ph Ca 2 Na Mg 2 f IG Cl - + SO % Matsuo -Goshiki Lake f IG 0.7 Ca 2+ + Mg % G3 0% meq/l Na + +K + Ca 2+ Mg 2+ Cl- HCO3 - SO4 2+ Na + + K + HCO 3-100% f IG

10 Mt. Iwate Kanzawa-shimizu Springs meq/l Na + +K + Ca 2+ Mg 2+ d-excess Cl - HCO 3 - SO 4 2- Hachimantai R. Matsu R. Aka sulfide minerals volcanic gases d-excess 15 HCO 3 type Mixing SO 4 type d-excess 20 5 dexcess d-excess d-excess S1 S d-excess Ca-HCO 3 Ca-SO 4 d-excess Ca-SO 4 HCO 3 Cl Ca-HCO 3 Ca-SO 4 110

11 m p p U pp d-excess Yamamoto, S. (1995) : Volcano Body Springs in Japan. Kokon Shoin, Tokyo, 264p. 111

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