Study On The Enrichment Mechanism Of H₂SiO₃ And Sr In Xifeng Mineral Water

Guizhou Xifeng mineral water?geothermal water?has a long history of development.In1989,it was identified as "metasilicate-strontium-bicarbonate-containing radon spring" by the National Drinking Mineral Water Technology Review Group.It is a famous and rare source at home and abroad.It is a high-quality underground hot mineral spring resource that integrates physiotherapy mineral spring and drinking mineral spring,and contains a variety of trace mineral elements required by the human body.It was once known as the high-quality hot mineral water that can be compared with French Evian spring.The study of the enrichment mechanism of H₂SiO₃ and Sr in the mineral water and its occurrence law have important guiding significance for the development and protection of precious mineral?temperature?spring water resources in the research area.In this research work,field investigations,water sample collection,and rock sample collection were carried out on the Xifeng mineral spring water collection area.A total of 10 water samples were taken,including 3 Xifeng hot springs,1 geothermal well,3 surface rivers,and karst3 pieces of spring water.There are 10 rock samples,including 10 thin slices under the microscope,10 main micro test pieces,and 6 strontium isotopes.Analyze the H₂SiO₃ mineral source design temperature water-rock influence experiment,10 groups in total,p H influence experiment 10 groups,hydrolysis soaking experiment 10 groups.There are 10 groups of temperature water-rock influence experiments,10 groups of p H influence experiments,and the sampling time is set to: 3d,5d,7d,9d,11 d,13d,15 d,19d,21,23 d,and 10 groups of hydrolysis immersion experiments,sampling The time is set to: 3d,5d,21 d,45d,75 d,100d.The water samples tested 10 major and trace geochemicals,10 hydrogen-oxygen isotopes,10 sulfur isotopes,8 strontium isotopes,2tritium isotopes,and 2 14-carbon isotopes.1.The spatial distribution of H₂SiO₃ and Sr elements in mineral water in the area and theirinfluencing factors were studied.The spatial distribution relationship of the characteristic components in the mineral water in the study area is determined.From surface river water,karst spring water to deep hot mineral water,the content of H₂SiO₃ and Sr gradually increases,and is affected by runoff conditions,geological environment,temperature,pressure and p H..Among them,the content of characteristic element minerals determines the degree of enrichment of the elements in the mineral water.Factors such as water-rock interaction,temperature-pressure,and p H balance play an important role in the temporal and spatial distribution of mineral components.2.Through indoor design water-rock leaching experiment data,the material source of H₂SiO₃ and Sr in mineral water,the process of water-rock interaction and the external impact on it were preliminarily discussed,and the genetic model of Xifeng mineral water was established.?1?The source of metasilicate minerals is determined by the interaction between the Sinian Dengying Formation and the Qingshuijiang Formation of the Banxi Group and the deep thermal fluid.?2?Discussed which factors control the formation of metasilicic acid-rich mineral water.The design of the influence of water-rock interaction experiments shows that the aqueous solution is weakly alkaline,and under alkaline conditions and relatively high temperatures?40?⁶0??),the cumulative release of metasilicic acid in siliceous dolomite and metamorphic rocks gradually increased,but the mineral spring did not change significantly with the strontium content.3.The isotope method determines the source of mineral water in the study area and the material sources of H₂SiO₃ and Sr.Sr-rich minerals originate from the Sinian Dengying Formation,which is a thermal reservoir aquifer.Under geothermal fluid convection conditions,Sr²⁺ in mineral water mainly moves in the form of chloride along the fracture zone and the cracks and pores of the rock from deep to shallow.With the decrease of temperature and pressure,especially with the shallow SO₄^2-and HCO₃^-Mixing of higher aqueous solutions or encountering sulfates and carbonates rocks will destroy the balance of the water system.Sr²⁺ and Ba²⁺ chlorides decompose,Cl-exchanges with SO₄^2-,Sr²⁺and Ba²⁺and SO₄^2-or HCO₃^-Combine to produce insoluble compounds SrSO₄,BaSO₄ or SrCO₃,BaCO₃ and precipitate from the solution.The H₂SiO₃ mineral originates from the thermal storage aquifer and the metamorphic rock mass below it.It is formed under geological conditions with a thermal storage depth of2801.07²949.64 m and a circulating deep thermal storage temperature of 93.51?⁹7.67?.The hydrolysis of quartz minerals and geothermal fluids The silicified carbonate rock formed during the convection cycle along the fault is dissolved and filtered,so that SiO₂ is continuously migrated,enriched and combined with H+ in the water body to form H₂SiO₃ type warm mineral water.The result of hydrolysis of silica minerals.Through the combination of the above water-rock experiments and geochemical methods,the research on the enrichment mechanism ofH₂SiO₃ and Sr in Guizhou Xifeng mineral water has important theoretical and practical guiding significance for the effective development and utilization of mineral water.