热带地理2012，Vol.32Issue(5)：481-486,6.
岩溶作用季节性变化对洞穴沉积物沉积速率的影响研究——以重庆雪玉洞地下河系统为例
Impact of Seasonal Karstfication on the Precipitation Rate of Cave Sediments:A Case Study of the Underground River System of the Xueyu Cave, Chongqing
摘要
Abstract
The cave sediment is a product of karstification. The seasonal variation of karstification has greatly impacted on the precipitation rate and feature of sediment. Selected hydrochemical indictors in the groundwater, the precipitation rate of the cave sediment and carbon dioxide concentration in the case of Xueyu Cave, Chongqing were monitored during Feb. 2007 to Sep. 2011. Results show that the bicarbonate and calcium concentrations are the main components of the total ions in the groundwater with a ratio of 84.2%-94.4%. It demonstrates the chemical components are controlled by karstfication of the covered bedrock of the carbonate, and the hydrochemical faces are Ca2+- HCO,. Compared to other karst areas in SW China, the better overlaying vegetation, more dead branches and leaves, soft ground and developed rock crack in the study area enable the karstification to be stronger in rainy season than that in dry season. The conductivity and concentrations of calcium and bicarbonate in rainy season were 20.1 %, 29.9 % and 16.5 % higher than that observed in dry season, respectively. In additional, due to the abundant water source during the rainy season in the performance of increase in drip water, the precipitation rate in rainy season is 82.5% higher than that in dry season. The sediments can not be easily weathered and their color remains white like jade, which is caused by stable temperature, saturated humidity and high carbon dioxide concentration in the cave causes.关键词
岩溶作用/季节变化/地下水化学/洞穴沉积物/沉积速率/雪玉洞Key words
karstification/ seasonal variation/ hydrochemistry of underground water/ cave sediments/precipitation rate/ the Xueyu Cave in Chongqing分类
天文与地球科学引用本文复制引用
徐尚全,殷建军,王晓晓,杨平恒,毛海红,沈立成..岩溶作用季节性变化对洞穴沉积物沉积速率的影响研究——以重庆雪玉洞地下河系统为例[J].热带地理,2012,32(5):481-486,6.基金项目
国家自然科学基金项目(41072192,41103068) （41072192,41103068）
中国地质调查局项目(1212011087119) （1212011087119）
重庆市科委院士专项(编号:CSTS,2010BC7004) （编号:CSTS,2010BC7004）
重庆市国土房管局科技项目 （）
西南大学博士基金项目(SWU111009) （SWU111009）
