白云岩喀斯特洞穴水理化性质特征及其环境指示研究:以绥阳双河洞为例

发布时间：2019-01-06 12:20

【摘要】：为揭示白云岩岩层中发育洞穴中的洞穴水地球化学特征的动态变化特征、控制因素及其环境意义,从2015年4月至2015年9月对绥阳双河洞洞穴水的水化学指标进行了为期6个月的动态监测。结果表明:(1)双河洞洞穴水的水化学类型主要为HCO_3~ -Ca~(2+)-Mg~(2+)和SO_4~(2-)-HCO_3~ -Ca~(2+)-Mg~(2+)型水,阴离子中HCO_3~ 和SO_4~(2-)是优势离子,阳离子中Ca~(2+)、Mg~(2+)为优势离子;(2)洞穴滴水中方解石饱和指数(SI_c)、白云石饱和指数(SI_d)之间有显著正相关性且与水样中气相二氧化碳分压对数(lg pCO_2)成反比;(3)洞穴水滴率、滴量、pH对气候有一定的响应,其地球化学指标具有显著的季节效应;(4)洞穴滴水中的电导率(EC)与Ca~(2+)离子浓度呈显著线性关系;(5)洞穴水中SO_4~(2-)和Cl~-含量占比(SC)对EC和总硬度(TH)之间的线性关系具有重要影响;(6)滴水中Sr/Ca、Mg/Ca比值表现出在略微滞后的情况下同步升高的现象,证明预先沉积作用(PCP)的存在。
[Abstract]:In order to reveal the dynamic change characteristics, control factors and environmental significance of the geochemical characteristics of caves in dolomite strata, From April 2015 to September 2015, the hydrochemical indexes of cave water in Shuanghe cave of Suiyang were monitored dynamically for 6 months. The results show that: (1) the main hydrochemical types of Shuanghe cave water are HCO_3~-Ca~ (2)-Mg~ (2) and SO_4~ (2 -)-HCO_3~-Ca~ (2)-Mg~ (2). HCO_3~ (2) and SO_4~ (2 -) were dominant ions in anions, and Ca~ (2) and Mg~ (2) were dominant ions in cations. (2) there is a significant positive correlation between calcite saturation index (SI_c) and dolomite saturation index (SI_d) in dropping water in caves, which is inversely proportional to the logarithm of gas phase partial pressure of carbon dioxide (lg pCO_2) in water samples; (3) Cave water droplet rate, drop quantity and pH have a certain response to climate, and their geochemical indexes have significant seasonal effect, (4) the conductivity (EC) and Ca~ (2) ion concentration in cave dripping water have a significant linear relationship. (5) the ratio of SO_4~ (2-) and Cl~- content in cave water (SC) has an important influence on the linear relationship between EC and total hardness (TH); (6) the ratio of Sr/Ca,Mg/Ca in dripping water increased synchronously under the condition of slight lag, which proved the existence of pre-deposition (PCP).
【作者单位】：贵州师范大学喀斯特研究院;国家喀斯特石漠化防治工程技术研究中心;
【基金】：国家自然科学基金(41361081,41301504) 贵州省科技计划项目(黔科合G字[2014]4004-2号) 贵州省重大应用基础研究项目(黔科合JZ字[2014]200201)
【分类号】：P641.13

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