¹ºS » .3 ¼ .+ῌ.2 ,**0 0Japanese Journal of Structural Geology, No. .3, .+ῌ.2, ,**03"#$%

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P-V-T

Development of experimental apparatus for continuous P-V-T
measurements of crustal ﬂuids around critical point

*ῌ*
Yoshiharu Uchida* and Kenshiro Otsuki*
Abstract : Crustal ﬂuids are the aqueous solution of salts (NaCl, KCl, CaCl, etc.) andgasses (CO,, CH., N, etc.), most commonly a H,O-CO,-NaCl system. However, we havelittle information on their thermodynamic properties and the equations of states(pressure(P)-volume(V)-temperature(T) relation) at high CO, concentration and salinity
under the conditions up to ,** MPa and around .**, where water-rock interaction issigniﬁcant. We developed a new experimental apparatus that can control P and T
independently up to ,** MPa and /** to measure V continuously.
We experimented for pure water over the T range up to .** at +** MPa, and CO, up
to ,** at -* MPa and +** MPa, and examined the performance of our new apparatus
by comparing the experimental data with those from SUPCRT3,. The experimental
data for the pure water are well consistent with SUPCRT3, within +῍ of error, while
the data for CO, deviate ,*῍ at maximum from SUPCRT3,. A main cause of thedeviation is likely to be attributed to the overestimation of T by about -* or less. We
will accomplish the apparatus in the near future as an innovative experimental tool.
Key words : crustal ﬂuid, equation of state (EOS), P-V-T, NaCl, CO,, continuous measurements !
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Department of Geo-Environmental Sciences, Tohoku University, Miyagi 32*ῌ2/12, Japan

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H,O-CO,-NaCl v>(qrlzA?¤¥_¦§ Gehrig 0+32*3 =(¨z'A@ t©ªtBy E H, O-CO,-0wt.῍NaCl «E( -** MPaῌ/0* 4 4")T ,W¬6B­®E(>?@ A +*wt.῍NaCl 4q+ +,mol.῍CO, )T ,*wt.῍ NaCl 4q+ 1 mol.
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inclusion technique '2E)!

0  CO,-NaCl *+F H,O-+*/,* 
mol.῍ CO,-0/,* wt.῍ NaCl, H,O-//+* mol.῍ CO,-.*wt.῍NaCl G  ,**H/** MPaῌ-**H2**I ,J' P-V-T 9KῌLMNOῌNaCl +C1
Brown and Lamb, +323, Schmidt et-P%
al., +33/, Schmidt and Bodnar, ,*** E)*)1.Q'+!,- R/'/ S#T#1P SiO, U101##12&< V2 - 34U'*W 56TP Ag X
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      !  " #$ 
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D  %E45FB "G;H<:'()IJ 'K0%
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PJQ  
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1´ +ῌ+** I

 2  Lr`! SUPCRT3, !B 9a [; n# +** MPa   /** ' F SUPCRT3, ! +῍ _-.A!(# aWI 9b CO, n# -* MPa ! +** MPa  ,** ' F c³,*῍ *WQ SUPCRT3, :-.Adµ©¶2·¸¹ ¡#

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 LMC*8. RE8#STJ/ UV ῌ WXYZ
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sO 6n & ῌe.:817=+;<,A M}D$9, /d 9/K>?@`6AB
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:Fey - 1k3XeyG8# HI=JK LM+3N6 yXῌ j¡O¢)£P ¤ G#fQ: ῌ ¥¦.3N6 R§S¨ T.U{V©W3¥ª«N6 ¬X­M Y®DZ ¯= [°±IJ²³´
 1¶:·¸8K
µZY3N6
Anderko, A. and Pitzer, K. S., +33-, Equation of state
representation of phase equilibria and volumetric properties of the system NaCl-H,O-CO,
above /1-K. Geochim. Cosmochim. Acta, /1, +0/1῎,1,-.
Bowers, T. S. and Helgeson, H. C., +32-, Calculationof the thermodynamic and geochemical consequences of nonideal mixing in the system
H,O-CO,-NaCl on phase relations in geologic
systems : Equation of state for H,O-CO,-NaCl
ﬂuids at high pressures and temperatures. Geochim. Cosmochim. Acta, .1, +,.1῎+,1/.
Brown, P. E. and Lamb, W. M., +323, P-V-T properties of ﬂuids in the system H,O¹CO,¹NaCl :New graphical presentations and implications
for ﬂuid inclusion studies. Geochim. Cosmochim.
Acta, /-, +,*3῎+,,+.
Duan, Z., Moller, N. and Weare, J. H., +33, a, An
equation of state for the CH.-CO,-H,O system :I. Pure systems from * to +*** and * to 2***bar. Geochim. Cosmochim. Acta, /0, ,0*/῎,0+1.
Duan, Z., Moller, N. and Weare, J. H., +33, b, An
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Duan, Z., Moller, N. and Weare, J. H., +33/, Equationof state for the NaCl-H,O-CO, system : Prediction of phase equilibria and volumetric properties. Geochim. Cosmochim. Acta, /3, ,203῎,22,.
Duan, Z. and Sun, R., ,**,, An improved model
calculating CO, solubility in pure water andaqueous NaCl solutions from ,1- to /-- K andfrom * to ,*** bar. Chem. Geol., +3-, ,/1῎,1+.
Gehrig, M., +32*, Phasengleichgewichte und PVTDaten ternarer Mischungen aus Wasser, Kohlendioxid und Natriumchlorid bis -kbar und//* . Doctoral dissertation, Univ. Karlsruhe.
Johnson, J. W., Oelkers, E. H. and Helgeson, H. C.,+33,, SUPCRT3, : A software package for calculating the standard moral thermodynamic
properties of minerals, gases, aqueous species,½ 47 ½

%&ῌ'()*+

and reactions from + to /*** bar and * to+***. Computers Geosci., +2, 233ῌ3.1.
ῌ
 ,**/ 
ῌ
 !"# no. .3
1-ῌ10.
Saul, A. and Wagner W., +323, A fundamental equation for water covering the range from melting
line to +,1- K at pressures up to ,/*** MPa. Jour.
Phy. Chem. Ref. Data, +2, no. ., +/-1ῌ+/00
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Synthetic ﬂuid inclusions : XIII. Experimental
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Sci., ,0-, ../ῌ./..

, 48 ,