Spatiotemporal Variations of Hydrogen and Oxygen Stable Isotopes of in Karst Cave Drip Water and Their Indicative Significance
In order to explore the spatiotemporal variations and indicative significance of δD and δ18O in drip water from Ma'huang Ca-ve,this study systematically monitored and analyzed four drip points within the primary branch of the Shuanghe Cave system.The mo-nitored points were catagorized into two Class Ⅰ(low-flow)and two Class Ⅱ(high-flow)types.The findings are as follows:(1)Drip water δD and δ18O values exhibit a pattern of higher values in the dry season and lower values in the rainy season.(2)Drip points with low flow rates show smaller variations in δ18O and ions,indicating a lesser response to external climatic conditions;among the high-flow points,there are distinctions between percolation flow and vadose zone flow—drip points of percolation flow exhibit minimal re-sponse to external climate,suggesting a stable groundwater recharge,whereas drip points of vadose zone flow show the highest correla-tion between δ18O values and temperature/precipitation,effectively reflecting climatic changes.This study aims to detail the spatiotem-poral variations of δD and δ18O in Ma'huang Cave drip water along with their hydrochemical characteristics,which could prove useful in providing a reference basis for paleoclimate reconstruction from cave sediments.
cave drip waterhydrogen and oxygen stable isotopesclimate indicatorshydrochemistry
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