Cryogenic physico‐chemical precipitations: Iron, silica, calcium carbonate

Thea Vogt

Permafrost and Periglacial Processes, 1990, vol. 1, issue 3‐4, 283-293

Abstract: In Quaternary and present‐day alluvial deposits, secondary mineral accumulations are common. Previous theoretical and experimental studies have shown the occurrence of frost‐related iron and calcium carbonate precipitations. Microscopic and ultramicroscopic observations of alluvial materials from Quaternary cold periods allow the recognition of diagnostic features of cryogenic calcite crystallizations. Some iron and silica concentrations also suggest frost control, although further laboratory experiments are needed to obtain a satisfactory understanding of the mechanisms concerning these precipitations. Nevertheless, it can be suggested that the migration of minerals under frost action is probably more important than previously taken into account. Dans les dépǒts alluviaux actuels et quaternaires, les accumulations secondaires de minéraux soat chose courante. Des travaux théoriques et expérimentaux avaient déjà montré la possibilité de précipitations de fer et de carbonate de calcium dues au gel. Des observations microscopiques et ultramicroscopiques sur des matériaux alluviaux de périodes froides quaternaires ont permis de reconnaǐtre des formes de cristallisation de la calcite typiquement cryogéniques. Certaines concentrations de fer et de silice suggèrent aussi une origine liée au gel, mais seuls des travaux expérimentaux pourraient apporter une connaissance satisfaisante des mécanismes en jeu. On peut cependant suggérer que la migration de minéraux sous l'effet du gel a probablement plus d'importance que les auteurs des articles antérieurs ne semblent le croire.

Date: 1990
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Persistent link: https://EconPapers.repec.org/RePEc:wly:perpro:v:1:y:1990:i:3-4:p:283-293

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