title: [Transformation of carbonate minerals in a cyano-bacterial mat in the course of laboratory modeling].
abstract: A laboratory model of a cyano-bacterial mat with mineral layers of carbonates was used to examine the dynamics of the transformation of calcium-magnesium carbonate under the conditions of a soda lake. The activity of various organisms of the cyanobacterial community results in conditions under which the Ca-Mg carbonate precipitate undergoes changes. The crystal lattice of the initial carbonate is restructured; its mineralogical composition changes depending on the conditions of the mat. In magnesium calcites, which are formed under such low-temperature conditions, a rudimentary cation adjustment can occur with the formation of dolomite domains. These experiments confirm the hypothesis that the dolomite found in stromatolites is of a secondary origin and can be formed in the course of transformation of Ca-Mg carbonates under alkaline conditions in an alkaliphilic cyanobacterial community.
authors.forename: L V
authors.initials: LV
authors.lastname: Zaĭtseva
authors.forename: V K
authors.initials: VK
authors.lastname: Orleanskiĭ
authors.forename: A O
authors.initials: AO
authors.lastname: Alekseev
authors.forename: G T
authors.initials: GT
authors.lastname: Ushatinskaia
authors.forename: L M
authors.initials: LM
authors.lastname: Gerasimenko
mesh_terms: D018533:Biomass; D002119:Calcium Carbonate / Q000737:chemistry*; D011232:Chemical Precipitation; D000458:Cyanobacteria / Q000378:metabolism* / Q000648:ultrastructure; D019418:Evolution, Chemical; D005618:Fresh Water; D019015:Geologic Sediments / Q000737:chemistry / Q000382:microbiology; D008274:Magnesium / Q000737:chemistry*; D008854:Microscopy, Electron; D008855:Microscopy, Electron, Scanning
chemical_list: C005479:magnesium carbonate; D002119:Calcium Carbonate; D008274:Magnesium; C028042:calcium magnesium carbonate