Variation Characteristics Of Cave Water Geochemistry In Jinhua Beishan And Its Climate Implications

This article chooses the Jinhua Shuanglong Cave and ErXian Cave as the study object, through study the geochemical variation of Drip water and reveal it’s climate implications. Thestudy begin from May 2014 to May 2015. Monitoring indicators included temperature,cave water conductivity and pH,the anion concentration of HCO3-、Cl-、SO42-, the ionic concentration of Ca2+、Mg2+、Ba2+、Sr2+ and element ratios of Mg/Ca、Sr/Ca In order to reveal the cave water climate implications, we analysis the geochemical changes and do a comparison with the outside climate change. The mai n research results are as fol lows:(1) The variation of temperature in cave and water temperature is relatively small, mainly affected by outside temperature and change wih the outside temperature. Temperature in cave and water also affect by distance from thecave. Migration path can also affect the the cave water temperature.(2) Affected by precipitation, the pH of the cave water show:low in rainy season low, high in dry season. Cave water conductivity affected by outside precipitation and migration paths, there are differences between different types.(3) Concentration of HCO3- mainly affected by precipitation, there are differences between the concentration and the variation between different types of cave water; Concentration of CI- changes relatively complex, and the correspondence between changes in precipitation and temperature is notobvious; Concentration of SO42- has obvious seasonal variation, the rainy season high, low dryseason, Affected by migration path, different types of the cave water have different characteristic.(4)Affecting by the factors, such as the thickness of the overlying bedrock, migration pathways and water-soil-rock interaction time,Average and variation range of Cation concentration (Ca2+, Mg2+, Ba2+ and Sr2+) and their ratio in different cave water is different.The cation concentrations exhibit increased rainfall at the beginning,and their concentrations of the rainy season lower than the dry season’s. Precipitation is an important factor affecting changes in cation concentration.(5)The ratio of Mg/Ca, Sr/Ca,Ba/Ca in cave water have a good indication of precipitation in the outside world.and is also affected by temperature. The Mg/Ca ratio change is largely caused by the rain outside, but is also affected by temperature;The Sr/Ca ratio except the role of impact by precipitation is also affected by other factors;The Ba/Ca ratio change complex, implications for precipitation and temperature are not obvious.