Boreskov

PP‐48BACTERIAL MINERALOFORMATION IN WATER ECOSYSTEMSOF MUD‐VOLCANIC ORIGIN (THE BAIKAL REGION)Tatarinov A.V.*, Danilova E.V.**, Yalovic L.I.*, Barkhutova D.D.***Geological Institute SB RAS, Ulan‐Ude city, Russia**Institute of General and experimental Biology SB RAS, Ulan‐Ude city, RussiaGeologic setting and hydrogeological peculiarities of water ecosystems formation (saltylakes, thermal sources) situated in mud‐volcanic structures of Cainizoic age of the Baikalregion have been studied. Salty lakes and thermal sources are the microorganisms and theircommunity environment and participate in lythogenesis, petrogenesis andmineraloformation processes.The objects of study are sandy‐silt formations of salty lakes, silts, travertines andgeyserites of thermal sources of Torey, Undino‐Dainskaya, Ivolginskaya, Tsipikanskaya,Eravninskaya, Barguzinskaya and Tunkinskaya depressures, some cutting of hollow sides andbottoms in the latter ones.It is revealed that some salty lakes (Kulinye, Alginskie bogs of Baunt resort) are formednowadays due to pouring out of alkaline waters of thermal sources of gryphon type. Alltypes of salty lakes and alkaline thermal sources are characterized by extreme conditions ofvital activity of haloalcalophile communities microorganisms.Taking into account the travertine sediments of Garga mineral source of the Baikal zoneit was established by us that thermophile cianobacteria are able to form actuallymonomineral calcite rocks and a number of accessory ore minerals including native gold inthem.A great diversity of microorganisms has been revealed in microbe mats and silts ofcarbonate waters of Zhoigon source in Vostochno‐Sayanskaya province depositing calcitetravertine with numerous lytiphiсs biofilms of bacterial mats. Microscope study of mucousochric sediment formed in this source waters pouring out place revealed the presence ofnoticeable number of filiform ferrobacteria close to Leptothrix sp. and Gallionella sp.associating with cianobacterial mats.220