E3S Web Conf.
Volume 98, 201916th International Symposium on Water-Rock Interaction (WRI-16) and 13th International Symposium on Applied Isotope Geochemistry (1st IAGC International Conference)
|Number of page(s)||5|
|Section||Geochemistry of Natural Waters: From Atmospheric Precipitations to Deep Brines|
|Published online||07 June 2019|
Geochemistry of the frost mound’s ice in the Sentsa River Valley (Oka plateau, East Sayan Mnt.)
Institute of the Earth’s Crust, Siberian Branch, Russian Academy of Sciences, 664033 Irkutsk, Russia
2 Irkutsk state university, 664003 Irkutsk, Russia
* Corresponding author: email@example.com
The authors have studied the chemical composition of ground ice sampled from the frost mounds located in the unconsolidated sediments of the Sentsa River valley (Oka plateau, Eastern Sayan Mountains) to reconstruct the formation history of these cryogenic creations. Numerous frost mounds of various sizes are mainly composed of clayey silts with interlayers of heavy silts and ice lenses. It is found that the chemical composition of the melt ice sampled from lenses and layers within the frost mounds is HCO3 Ca, SO4-HCO3 Ca and NH4-HCO3 Ca with 6.5–15.6 mg/L salinity and pH = 5.6÷6.1. Whereas, the salinity of the melt texture-forming ice sampled from the ice with fractions of enclosing clayey silts was much higher: from 50 up to 792.5 mg/L. River and lake water is ultra-fresh HCO3 Ca with 99–132 mg/L salinity. The geochemical features of ground ice depend on a water-rock interaction, a presence of organic matter in the unconsolidated sediments and a repeated volcanic activity. The frost mounds are confined to a lacustrine sediments area in the backwater zone that was formed by the Late Pleistocene end moraine. The frost mounds have probably a mixed segregation-injection genesis.
© The Authors, published by EDP Sciences, 2019
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