MODELING OF THE EVOLUTION OF GROUND WATERS IN A GRANITE SYSTEM AT LOW-TEMPERATURE - THE STRIPA GROUND WATERS, SWEDEN

被引:57
作者
GRIMAUD, D
BEAUCAIRE, C
MICHARD, G
机构
[1] Laboratoire de Geochimie, Eaux Université Paris 7, IPG, 75251 Paris Cedex 05
[2] Laboratoire de Geochimie, Eaux Université Paris 7, IPG, 75251 Paris Cedex 05, 2, place Jussieu
关键词
D O I
10.1016/0883-2927(90)90025-Z
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
From chemical data collected by Nordstrom and his colleagues on Stripa ground waterswe have tried to model the evolution of the chemical composition of a ground water in a granitic system at low temperature. The existence of two end-member ground water compositions made it possible first, to test the conventional model of a geothermal system according to which an overall equilibrium between the waters and a given mineral assemblage can be defined, and then to show that such a model could be extended to low temperatures (10°C). Conversely, if we know the mineral assemblage, the equilibration temperature and the charge of the mobile ions (in this case, Cl), the composition of the solution is entirely fixed. In our model of the Stripa ground waters, the existence of two end-member ground water compositions can be explained by an evolution from a "kaolinite-albite-laumontite" equilibrium to a "prehnite-albite-laumontite" equilibium, the latter requiring less Al than the former. We have also emphasized the importance of the Cl ion concentrions ofof the ground waters, because they cab be considered as indicators of the degree of reaction progress between rock and water, thus determining the degree of equilibration of the system. © 1990.
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页码:515 / 525
页数:11
相关论文
共 40 条
[1]  
Andrews, Davis, Fabryka-Martin, Fontes, Lehmann, Loosli, Michelot, Moser, Smith, Wolf, The in situ production of radioisotopes in rock matrices with particular reference to the Stripa granite, Geochim. cosmochim. Acta, 53, pp. 1802-1816, (1989)
[2]  
Andrews, Ford, Hussain, Trivedi, Youngman, Natural radioelement solution by circulating groundwaters in the Stripa granite, Geochim. cosmochim. Acta, 53, pp. 1791-1802, (1989)
[3]  
Andrews, Hussain, Youngman, Atmospheric and radiogenic gases in grounwaters from the Stripa granite, Geochim. cosmochim. Acta, 53, pp. 1831-1842, (1989)
[4]  
Beaucaire, Michard, Origin of dissolved minor elements (Li Rb Sr Ba) in superficial waters in a granitic area, GEOCHEMICAL JOURNAL, 16, pp. 247-258, (1982)
[5]  
Bowers, Jackson, Helgeson, Equilibrium Activity Diagrams, (1984)
[6]  
Bowers, von Damm, Edmond, Chemical evolution of mid-ocean ridge hot springs, Geochim. cosmochim. Acta, 49, pp. 2239-2252, (1985)
[7]  
Carlsson, Egerth, Olsson, Westlund, Core-logs of the vertical hole V2, Stripa Project Tech. Repo. 82-05, (1982)
[8]  
Carlsson, Olsson, Strejkal, Core-logs of borehole VI down to 505 m, Stripa Project Tech. Rept. 82-04, (1981)
[9]  
Carlsson, Olsson, Strejkal, Core-logs of the subbhorizontal boreholes N1 and E1, Stripa Project Tech. Rept. 82-04, (1982)
[10]  
Clauer, Frape, Fritz, Calcium veins of the Stripa granite (Sweden) as records of the origin of the groundwaters and their interactions with the granite body, Geochim. cosmochim. Acta, 53, pp. 1777-1782, (1989)