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Abstract
HSAWA MITA AMADA
ISHIMA AZAHAYA
Beppu Geo- thermal Research Laboratory, Institute for Geothermal Sciences, Graduate School of Science, Kyoto University, Noguchibaru, Beppu, Oita , Japan.
Department of Earth Science and Technology, Faculty of Engineering and Resource Science, Akita Univer- sity, Tegatagakuen-cho, Akita , Japan.
Crustal fluid research group, Institute of Geology and Geoinformation, AIST, Higashi , Central- , Tsukuba, Ibaraki , Japan.
J. Hot Spring Sci.
For identification of diagenetic dehydrated fluids as source fluids of hot-spring water, we conducted chemical and isotopic analyses of waters and accompanied gases collected from hot-spring wells in the Miyazaki plain in the fore-arc region of Kyushu Island, Japan. Interpretation of systematical relationships appearing among chemical and iso- tope data, and geochemical estimation of hydrothermal temperatures of hot spring wa- ters revealed two hot-spring water source fluids in existing groundwaters of meteoric origin : squeezed pore water from marine sediments, and hydrothermal fluid of unidenti- fied generation stored in sedimentary rocks. Geochemical thermodynamic evaluation of the unidentified fluids using representative hot spring waters indicated a dehydrated in- terlayer water from clay mineral (smectite) at around . Furthermore, comparison to
Shinji O , Kazuhiro A , Makoto Y , Taketoshi M and Kohei K
Geochemical Features and Genetic Process of Hot-spring Waters Discharged from Deep Hot-spring Wells in
the Miyazaki Plain, Kyushu Island, Japan : Diagenetic Dehydrated Fluid as a Source
Fluid of Hot-spring Water
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Miyazaki plain, hot spring well, hot-spring water, geochemical feature, origin, diagenetic dehydrated fluid
results of a geochemical analysis of accompanied hydrocarbon gases and a geological consideration of genetic process of the source fluids of the hot spring waters implied their origin at di erent stages during the burial diagenesis of marine sediments. An important result obtained from comparisons of the chemical and isotopic data on some geochemical systematic diagrams is that hydrothermal fluid of hot spring waters in the Oita plain, also located in the fore-arc region of Kyushu, apparently have a di erent origin and genetical process from hydrothermal fluids of the Miyazaki plain.
Key words :
:
; Takamatsu
Giggenbach et al.,
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Table Brief summary of hot spring wells
Well Depth of Depth of screen Discharge Discharge rate Discharge SiO *
No. well (m) head (m) form (L/min.)* temp. ( ) (mg/L)
pumping pumping
self
self *
self
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self
pumping n.m.
pumping *
**
self *
Remarks) * Data referred from the public data tables (Onsen-bunseki-sho), ** The measuring site is far from the well. n.m. : not measured
Table m
m m
No. m
No.
No. No. ,
No. , No. , No. m, m, m, m
No. No.
. m
pH
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Table Analytical results of collected hot spring waters and estimated underground temperatures of hot spring waters
Na-K-Ca
Well pH Na K Mg Ca Li Cl HCO SO B D O *
No. (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) ( ) ( ) ( ) n.d.
n.d. n.d.
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n.a. n.a. n.a. n.a. n.a. n.a. n.a. n.a. n.a.
n.d.
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Remarks) Sampling date ; Nos. : Feb. , , Nos. : Feb. , , Nos. : Feb. , , No. : Feb. , , No. : Nov. , , n.d. : not detected, n.a. : not analyzed, * : derived from the Na-K-Ca geochemical thermo- meter mentioned in Nicholson ( )
Li B HCO
Na, K, Mg, Ca, Cl, SO Li B H
HCO pH .
D O The stable isotope Laboratory, GNS Science Limited
D O .
. No. No.
Cl JIS-
CH C H CO , N , O
CH N . O CO . CH
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Table Table
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Table Results of isotopic and chemical analyses of surface waters collected from rivers
Table Results of chemical and isotopic analyses of gases accompanied with hot spring waters Remarks) Sampling date ; No. a : Feb. , , Nos. b and
c : Feb. , , No. d : Feb. ,
D O Cl
No. Name of river
( ) ( ) (mg/L)
a Hitotsuse
b Hirowatari
c Kiyotake
d Ohyodo
Well CO N O CH C H C H C CO C CH C C H
No. ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( )
n.d.
n.d.
Remarks) Sampling date ; Nov. , for chemical composition and carbon isotopes, n.d. : not detected
Fig. No. No.
Na, K
SO
Cl HCO
HCO Cl
Na Na-Cl Na-Cl, HCO
Fig. HCO Cl TDS
Fig.
Na-Cl No. No.
HCO Na-Cl, HCO
HCO Cl
HCO Cl TDS No. , No. ,
No. , No. , No. No. No.
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Fig. Relation between TDS (total dissolved substance) and HCO /Cl ratio of hot spring waters with brine waters at Sadowara area and modern seawater. For the location of Sadowara area, black-star ( ) in Fig. .
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Fig. Relationships of D vs. O and D vs. Cl of hot spring waters in Miyazaki with modern seawater, river waters in the study area, ranges of pore waters of marine sediments and andesitic volcanic steam. For data points shown by open diamond (Nos. , , , and ), see text or refer Fig. . Ranges circled by dotted lines indicate formation waters shown by Kato and Kajiwara ( ).
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HCO Cl TDS
No. , No. , No. , No. , No.
No. No.
HCO Na-Cl, HCO HCO Cl
TDS No. , No. , No. , No. , No.
No. , No. , No. , No. , No. , No. ,
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No. No.
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Fig. Relation between D and B/Cl ratio of hot spring waters with modern seawater. Discrimi- nation for origins of hot spring waters by B/Cl ratio shown on Y-axis is done by means of an authorized geochemical method described in Inuyama ( ). For data points shown by open diamond (Nos. , , , and ), see text or refer Figs. and .
et al.
B Li Cl Soluble group
species
Cl Giggenbach
and Goguel, B-Cl
B Cl
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Cl mg L B Cl
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