The peculiarities of forming of natural waters geochemical characteristics and secondary products composition of airing in relation to composition of primary rock were determined from the viewpoint of interaction in water-rock system. In 1988 and 1989 hydrogeochemical sampling was performed at Apsat river basin located at the Kodar-Udocan district of Chita region. The river Apsat basin is consisted of granitic, sand boulder pebble, coal-bearing gravelly conglomerate formations. Fluorite, galena-sphalerite, chalcopyrite, molibdenite, wolframite sheelite, cassiterite, orthite, zircon-cryolite-pyroclore prevail as ore minerals and as well as muscovite in granitic formation.
According to chemical analysis data of 1988 natural waters of river Apsat belong to sodium-potassium calcium hydrocarbonate, calcium hydrocarbonate types (76% of samples), 2% of samples can be considered as calcium, sodium-potassium calcium fluoride hydrocarbonate types, others were related to sodium-potassium calcium, calcium sulfate hydrocarbonate types. It was defined that the variation limits of pH medium value were from 5.39 to 8.32, of ionic strength of solution - from 0.0002369 to 0.00939, of Kurlov's formula :
F 0-28 SO4 1-60 HCO3 37-98
M 0.009 - 0.117 ----------------------------
Mg 4-31 NA + K 7-52 Ca 34-79
According to 1989 chemical analysis the composition of waters can be considered as sodium-potassium calcium, calcium hydrocarbonate types (44% of samples), sodium-potassium calcium, magnesium-calcium sulfate hydrocarbonate types (in all 28% of samples), calcium, magnesium-calcium, calcium-magnesium sulfate types (12 % of samples), fluoride hydrocarbonate, hydrocarbonate chloride, hydrocarbonate sulfate types. The limits of variation of pH medium value were defined from 4.78 to 7.86, of ionic strength from 0.000567 to 0.0297, of Kurlov's formula :
F 0-34 Cl 0-53 SO4 0-48 HCO3 1-100
M 0.023 - 2.353 ----------------------------------
Mg 1-41 Ca 4-76 Na + K 94
Activities of ions were calculated and plotted on Helgeson's diagrams. The water diagram analysis of 1988 showed the convertion of secondary mineral leonhardite to kaolinite and gibbsite. Waters were partially saturated by quartz. As to diagrams of 1989 it should be concluded that partial leonhardite and kaolinite convertion into gibbsite was conceivable in stability fields of secondary minerals. Waters of 1989 were not saturated by quartz. Thus, airing products of rocks at Apsat river basin were transformed from leonhardite and kaolinite into gibbsite. Furthermore, noticeable convertion was enhanced in 1989 and characteristics of natural waters are changing from lowering content of hydrocarbonate types to increasing content of fluoride hydrocarbonate, hydrocarbonate sulfate types and to hydrocarbonate chloride and sulfate types formation
Baldanova D.D. P.O. Box 147 26, Butin str., Chita, 672090 RUSSIA Phone: (302-22) 1-17-21 Fax: (302-22) 1-25-82 E-mail: chem@cinr.chita.suRadnayeva D.B. P.O. Box 147 26, Butin str., Chita, 672090 RUSSIA
Borzenko S.V. P.O. Box 147 26, Butin str., Chita, 672090 RUSSIA