DBPapers
DOI: 10.5593/SGEM2015/B11/S1.068

ZONALITY AND MINERAL ASSOCIATIONS OF MODERN EVAPORATES IN THE SOUTH-MINUSINSK BASIN BY THE EXAMPLE OF TALOE LAKE AND AK-KOL LAKE (KHAKASSIA REPUBLIC)

A. Arkhipov, M. Ivanova, P. Tishin
Tuesday 4 August 2015 by Libadmin2015

References: 15th International Multidisciplinary Scientific GeoConference SGEM 2015, www.sgem.org, SGEM2015 Conference Proceedings, ISBN 978-619-7105-31-5 / ISSN 1314-2704, June 18-24, 2015, Book1 Vol. 1, 537-542 pp

ABSTRACT
In the South-Minusinsk basin (Khakassia republic) in the steppe zone of Ust-Abakan district, to the west from Chernogorsk the Ak-Kol lake and the Taloe lake tract are located. The sediments of these lakes are evaporites. The main purpose of this work is to study the mineralogical features, characteristic mineral associations and zonality of the deposits. X-ray diffraction analysis and scanning electron microscopy methods have been used to achieve these goals.
The work has been carried out in the analytical center of geochemistry of natural systems of Tomsk State University.
As the result of the research evaporate and terrigene mineral associations are recognized.
Evaporite association: for the Ak-Kol lake it is characterized as carbonate-sulfate-haloide association (there is a change of minerals from the coast to the center of the lake - in the coastal part calcite, thenardite and halite occur, and in the central - dolomite, halite and sulfates like thenardite (Na2SO4), konyaite (Na2Mg(SO4)2*5H2O), epsomite (MgSO4*7H2O), eugsterite (Na4Ca(SO4)3*2H2O) and wattevillite (Na2Ca(SO4)2*4H2O). For the Taloe lake tract there is also a mineral associations change from banks to center. In the coastal area there is calcite-thenardite-haloide association with an admixture of konyaite (sulphate of Na and Mg), in the central part - thenardite-calcite-gypsum-haloide association with admixtures of such sulfates as konyaite, epsomite, wattevillite. This is due to varying of degree of deposits drying.
Terrigenous association is based on the fragments of minerals presumably derived by eolian process and its composition depends on types of disintegrating of autochtonous rocks. The Ak-Kol lake terrigene deposits are characterized as quartz association, and for the Taloe lake tract there is the association of quartz, zeolites, micas and plagioclases. The difference between associations is caused by various intake sources of the lakes.
In conclusion we can say that the lateral sediments have vertical zonality and that zonal distribution of deposits depends on the degree of drying.

Keywords: Zonality, mineral associations, evaporates.

PAPER 10.5593/SGEM2015/B11/S1.068 : ZONALITY AND MINERAL ASSOCIATIONS OF MODERN EVAPORATES IN THE SOUTH-MINUSINSK BASIN BY THE EXAMPLE OF TALOE LAKE AND AK-KOL LAKE (KHAKASSIA REPUBLIC)

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