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

来源：

APPLIED GEOCHEMISTRY | 1990年 / 5卷 / 04期

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.

引用

页码：515 / 525

页数：11

共 40 条

[1]

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[2]

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[3]

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[9]

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[10]

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