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δ13C-δ18O Covariance:An Effective Indicator of hydrological closure for Lakes?

Acta Geologica Sinica(English Edition) 2008年第5期82卷 975-981页

作者： CHEN Jing＇an WANG Fushun WAN Guojiang TANG Degui David Dian ZHANG HUNAG Ronggui LI Jian XIAO Tangfu State Key Laboratory of Environmental Geochemistry Institute of Geochemistry Chinese Academy of Sciences Guiyang550002 Guizhou Department of Geography University of Hong Kong Pokfulam Road Hong Kong

The correlation between the δ^13C and δ^13C-δ^18O in primary carbonates is affected by several factors such as hydrological balance, total CO2 concentrations, climatic condition and lake productivity. The influence of these factors on the δ^13C-δ^18O correlation may be different on different time scales. In this paper, two different-type lakes in southwestern China, Lake Erhai and Lake Chenghai, are selected to investigate the influence of climatic pattern on the δ^13C-δ^18O correlation and to evaluate the reliability of the δ^13C-δ^18O covariance as an indicator of hydrological closure. The results show that there exists good correlation between the δ^13C and δ^18O in Lake Erhai （overflowing open lake） and in Lake Chenghai （closed lake）. This suggests that the δ^13C-δ^18O covariance may be not an effective indicator of hydrological closure for lakes, especially on short time scales. On the one hand, a hydrologically open lake may display covariant δ^13C and δ^18O as a result of climatic influence. The particular alternate warm-dry and cold-wet climatic pattern in southwestern China may be the principal cause of the δ^13C-δ^18O covariance in Lake Erhai and Lake Chenghai. On the other hand, a hydrologically closed lake unnecessarily displays covariant trends between δ^13C and δ^18O because of the buffering effect of high CO2 concentration on the δ^13C shift in hyper-alkaline lakes. We should be prudent when we use the covariance between δ^13C and δ^18O to judge the hydrological closure of lake.

关键词： carbonates δ^13C-δ^18O covariance hydrological closure climatic pattern

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δ13c-δ18O Covariance:An Effective Indicator of hydrological closure for Lakes?

δ13c-δ18O Covariance:An Effective Indicator of Hydrologica...

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作者：陈敬安王福顺 State Key Laboratory of Environmental Geochemistry Institute of Geochemistry Chinese Academy of SciencesGuiyang550002Guizhou

The correlation between theδc andδO in primary carbonates is affected by several factors such as hydrological balance,total CO concentrations,climatic condition and lake *** influence of these factors on theδ`(13)c-δ correlation may be different on different time *** this paper,two different-type lakes in southwestern China,Lake Erhal and Lake Chenghai,are selected to investigate the influence of climatic pattern on theδc-δO correlation and to evaluate the reliability of theδc-δO covariance as an indicator of hydrological *** results show that there exists good correlation between theδC andδO in Lake Erhai (overflowing open lake) and inLake Chenghal(closed lake).This suggests that theδC-δO covariance may be not an effective indicator of hydrological closure for lakes,especially on short time *** the one hand,a hydrologically open lake may display covariantδC andδ as a result of climatic *** particular alternate warm-dry and cold-wet climatic pattern in southwestern China may be the principal cause of theδc-δ covariance in Lake Erhai and Lake *** the other hand,a hydrologically closed lake unnecessarily displays covariant trends betweenδC andδ because of the buffering effect of high CO concentration on theδc shift in hyper-alkaline *** should be the buffering feeect of high CO concentration on theδC shift in hyper-alkaline *** should be prudent when we use the covariance betweenδC andδO to judge the hydrological closure of lake.

关键词： carbonates δ13C andδ18O covariance hydrological closure climatic pattern

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