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中国西部环境和生态科学研究计划 >
2002年资助项目 >
洞穴次生化学沉积物环境替代指标形成的地球化学动力学 >
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http://hdl.handle.net/2239/72728
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| Title: | 贵州七星洞系统中水文地球化学特征对滴水δ~(13)C_(DIC)的影响及其意义 |
| Other Titles: | Effects of hydrogeochemistry on δ~13C_(DIC) values of drip water in Qixing Cave,Guizhou,China and their implications |
| Authors: | Wang, Shijie(王世杰)
Luo, Weijun(罗维均)
Liu, Xiuming(刘秀明)
Xie, Xingneng(谢兴能)
Zhou, Yunchao(周运超)
Li, Tingyu(黎廷宇)
Liu, Qiming(刘启明) |
| Keywords: | 洞穴滴水(cave drip water)
水文地球化学特征(hydrogeochemistry)
稳定碳同位素(stable carbon isotope)
相关性(correlation)
贵州七星洞(Qixing Cave Guizhou) |
| Issue Date: | Nov-2009 |
| Publisher: | 《地学前缘》2009，16（6）：66-76. |
| Abstract: | [中文摘要]：2003年4月至2004年5月,笔者对贵州七星洞(QXD)进行了较为详细的监测,逐月采集了土壤水和洞穴滴水等样品,分别测定了样品的稳定碳同位素组成和水文地球化学参数。结果显示,9个滴水点同期的溶解无机碳同位素值(δ13CDIC)之间存在着大的差异,最大达6.9‰;δ13CDIC值偏重的Ⅰ组滴水,其Ca、Sr、HCO3、电导率(EC)和方解石饱和指数(SIC)等水文地球化学指标偏小,而Mg/Ca比值偏大,Ⅱ组则相反;不同滴水点的δ13CDIC值分别与相应滴水的Ca、Sr、HCO3、EC、Mg/Ca和SIC等水文地球化学指标之间存在较好的相关关系。进一步分析表明,与土壤水δ13CDIC平均值-9.9‰相比,Ⅰ组1#、2#、6#、7#和8#滴水点δ13CDIC值偏重4.5‰～5.7‰,主要是由大量的基岩溶解以及前期方解石沉积(prior calcite precipitation,PCP)共同作用的结果;Ⅱ组3#、4#、5#和9#滴水点δ13CDIC值偏重0.6‰～1.6‰,受基岩溶解和PCP过程影响较小,尤其是9#滴水点受影响最小。因此,若不考虑基岩溶解和PCP过程影响作用,将会极大地影响洞穴化学沉积物碳同位素记的准确解释。
[英文摘要]：Monitoring and sampling of soil waters and cave drip waters during the periods from April 2003 to May 2004 were performed monthly at Qixing Cave,Duyun,Guizhou,southwest China,in order to understand the effects of hydrogeochemisty on δ13CDIC of cave drip waters and their implications for interpreting the potential paleoenvironmental signal preserved in speleothems.The results show that there exists remarkable difference(≤6.9‰)among δ13CDIC of cave drip waters at 9 sampling sites synchronously.Drip waters are obviously classified into two groups. Compar ed to Group Ò ( 3# , 4# , 5# and 9# ) , Group Ñ ( 1# , 2# , 6# , 7# and 8# ) is characterized by heavier D 13CDIC values, smaller Ca, Sr and H CO3 concentrations as well as elect rical conductivity ( EC) and saturat ion index for calcite ( SIC) , and lar ger Mg/ Ca ratio. Good corr elations be2
t ween D 13CDIC of dr ip water and its corr esponding contents of Ca, Sr and H CO3 , EC, Mg/ Ca, and SIC , respec 2tively, have been found in drip water s. These char acteristics imply that D13CDIC of cave dr ip waters are con 2trolled to some ext end by hydrogeochemistry. In comparison with average D 13CDIC value - 9. 9 j of soil water s,D13CDIC values of drip waters in Group Ñ a re heavier up t o 4 1 5 j 25 1 7 j , which is caused by the contr ibution from amounts of bedrock dissolution and prior calcite precipitat ion (PCP) ; by contr ast, those in Group Ò areslightly heavier ( 0 1 6j 21 1 6 j ) , which is affected less by bedrock dissolution and PCP, especially for 9# drip water . There fore, the accurate interpretation of D 13 C r ecorded in speleot hems can not be guaranteed if not considering the effect s of the above mentioned hydrogeochemical processes. |
| URI: | http://hdl.handle.net/2239/72728 |
| Appears in Collections: | 科学论文
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