Summary
Silica cement of sandy deposits is formed both in acid and alkaline environment. Investigations show that pH of silica bearing solutions plays a significant role in developing the water resistant fabric of silica gel. The paper also presents the results of laboratory investigations to clear up the nature and direction of the metamorphism of acid and alkaline silica containing solutions when these interact with various rock-forming minerals and to determine the role of surface films in the process of silica cement formation.
Résumé
Dans la zone d’hypergenèse, un ciment de silice peut se former dans les sédiments sableux, en milieu acide comme en milieu alcalin. Les recherches montrent que le pH des solutions siliceuses joue un rôle essentiel pour la formation d’une structure de gel siliceux résistant à l’eau. L’article présente des résultats d’essais de laboratoire ayant pour buts:
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1)
de mieux connaitre les processus métamorphiques engendrés par l’action de solutions siliceuses acides et alcalines sur divers minéraux des roches;
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2)
de déterminer le rôle des pellicules superficielles dans le processus de formation d’un ciment de silice.
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References
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Voronkevich, S.D., Evdokimova, L.A. & Ogorodnikova, I.N. Experimental investigations of silica cement forming in sandy deposits. Bulletin of the International Association of Engineering Geology 11, 33–36 (1975). https://doi.org/10.1007/BF02635448
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DOI: https://doi.org/10.1007/BF02635448