The Characteristic and Significance of Carbon Isotope (δ13CDIC) and Oxygen Isotope (δ18O) Value in Different Type of Karst Water in Guilin
详细信息
- 责任者：Huang Qibo (Institute of Karst Geology ; Chinese Academy of Geological Sciences ; Guilin 541004 ; China) ; Qin Xiaoqun
- 刊名：Geochimica
- 出版年：2013
- 卷期：42(1)
- 关键词：岩溶水 ; karst water ; 广西 ; Guangxi Province
- 页码：p.64-72
- 图表：illus., 1 table, 34 refs.
- 分类号：1701
- issnNo：ISSN0379-1726
- isbnNo：CN44-1398/P
摘要
After sampling and analyzing carbon isotope(δ13CDIC) and oxygen isotope(δ18O) in subterranean river and large karst springs in Guilin,Guangxi Zhuang Autonomous Region,southwest China,we found:(a) the carbon isotopic(δ13CDIC) values in subterranean river ranged from –15.99‰ to –12.29‰,with a mean value of(–14.03± 1.15)‰;and oxygen isotope(δ18O) values ranged from –6.63‰ to –5.64‰,with a mean value of(–6.24±0.24)‰;the carbon isotopic(δ13CDIC) values in large karst springs ranged from –15.26‰ to –9.22‰,with a mean value of(–12.05±1.57)‰;and oxygen isotope(δ18O) values ranged from –6.97‰ to –3.19‰,with a mean value of(–5.68±0.97)‰;(b) the carbon isotopic(δ13CDIC) and oxygen isotope(δ18O) values in subterranean river were generally lower than those in large karst springs;(c) the water circulation caused the isotopic differences in difference types of water.In subterranean river,water is in the form of conduit flow,with a fast rate of cycle and a short time of water-rock interaction.Therefore,little heavy carbon isotope(δ13CDIC) came from carbonatite rock to the water,with a short time of distillation process,so the carbon isotope(δ13CDIC) is light.In contrast,water in large karst springs is fissure flow,with a slow circulation rate and a long water-rock time,which lead more heavy HUANG Qi-bo et al.: Carbon and oxygen isotopes in karst water in Guilin carbon isotope came from carbonatite rock to the water,furthermore,its distillation process time is longer,so the carbon isotope(δ13CDIC) is heavy.δ13CDIC valued with the same situation as Sr/Ca,it could reflect the run-off condition of groundwater to some degree.
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