| The Correlation of Inorganic C,O Isotopic Values for Lake Chenghai Sediments and Its Environmental Implications |
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| 作者姓名： | 汪福顺 万国江 刘丛强 胥思勤 |
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| 作者单位： | [1]TheGraduateSchoolofChineseAcademyofSciences,Beijing100039,China [2]TheStateKeyLaboratoryofEnvironmentalGeochemistry,InstituteofGeochemistry,ChineseAcademyofSciences,Guiyang550002,Ch |
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| 摘 要： |
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| 关 键 词： | 碳同位素 氧同位素 湖泊沉只物 沉积环境 |
| 收稿时间： | 7 February 2003 |
The correlation of inorganic C, O isotopic values for Lake Chenghai sediments and its environmental implications |
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| Wang Fushun,Wan Guojiang,Liu Congqiang,Xu Siqin.The Correlation of Inorganic C,O Isotopic Values for Lake Chenghai Sediments and Its Environmental Implications[J].Chinese Journal of Geochemistry,2002,21(2):186-192. |
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| Authors: | Wang Fushun Wan Guojiang Liu Congqiang Xu Siqin |
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| Institution: | (1) The State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, 550002 Guiyang, China;(2) The Graduate School of Chinese Academy of Sciences, 100039 Beijing, China |
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| Abstract: | As one of the lakes on the Yunnan-Guizhou plateau, Lake Chenghai, which is a typical closed lake with the precipitation accounting
for one-third or more of the annual water input, has a high total salinity (almost like a saline lake). The inorganic C, O
isotopic composition of lake sediments bears much sensitive information about environmental change in the catchment, while
their correlations revealed the hydrological conditions under which the lake was closed. Their compositional variations are
controlled by temperature, precipitation, photosynthesis, dissolving equilibrium of the carbonate system and hydrological
condition. According to our research on inorganic C, O isotopic composition of Lake Chenghai sediments, we investigated the
environmental change of this catchment several decades ago. The results showed that Lake Chenghai has kept good hydrological
closing conditions in the past several decades, as indicated by the good correlation of inorganic C, O isotopic composition
of sediments; and that the environmental change in this catchment shows a tendency of periodical evolution on a 10−11-years scale, although the signal noise is relatively high at the bottom of the sediment core. And we also can extend C, O
isotopes, a sensitive environmental indicator, to nearly saline lake environments with a high degree of mineralization. |
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| Keywords: | Lake Chenghai δ 13C-δ 18O correlation sediment environmental implication |
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