贵州纳朵洞洞穴水化学性质和δ13CDIC特征及其影响因素研究

沈 蔚; 王建力; 王家录; 蒋先淑; 毛庆亚

doi:10.11932/karst20160114

贵州纳朵洞洞穴水化学性质和δ13CDIC特征及其影响因素研究

doi: 10.11932/karst20160114

1.
西南大学地理科学学院
2.
西南大学地理科学学院/三峡库区生态环境教育部重点实验室
3.
西南大学地理科学学院/安顺学院资源与环境工程学院

基金项目: 贵州省科技厅联合基金项目（黔科合J字LKA[2012]09号，黔科合J字LKA[2012]18号）；国家自然科学基金项目（41201565）

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出版历程
- 发布日期: 2016-02-25

Hydrochemistry and δ13CDIC features of cave water in Naduo cave, Guizhou and their influencing factors

1.
School of Geographical Science, Southwest University
2.
School of Geographical Science, Southwest University/Key Laboratory of the Three Gorges Reservoir Region's Eco-environment, Ministry of Education
3.
School of Geographical Science, Southwest University/Shool of Resources and Environmental Engineering, Anshun University

摘要

摘要: 文章对2013年4月至2014年5月期间贵州关岭纳朵洞四处滴水（D3、D4、D10、D11）和一处池水（DC）进行了动态监测，逐月采集洞穴水样品，分别测定样品的稳定碳同位素组成和水文地球化学参数，探讨了纳朵洞洞穴水化学性质、δ13CDIC值变化特征及其之间的相关性。结果表明：（1）洞穴水在监测期间相对方解石为过饱和水，且正在沉积碳酸盐，而在雨季洞穴水SIc降低,PCO2升高；（2）洞穴水的溶解无机碳同位素值（δ13CDIC）呈现显著的季节变化规律，夏季值偏轻，冬季偏重，可以较好的响应外界环境变化；（3）5个监测点洞穴水同期的δ13CDIC值存在较大差异，洞穴水δ13CDIC值分别与其相应的Ca2+、Mg2+、HCO3-、EC和SIc等水文地球化学指标之间存在较好的相关关系，受到不同程度土壤淋溶、基岩溶解以及前期方解石沉淀（PCP）的共同作用。因此，结合水文地球化学过程分析洞穴次生沉积物中碳同位素携带的环境信号，将提高对δ13C解译的准确性。
- 贵州纳朵洞 /
- 洞穴水 /
- δ13CDIC /
- 水化学特征
Abstract: Naduo cave is located in the east of Yunnan-Guizhou Plateau, Guanling county, Anshun City of Guizhou Province, China. This region is in humid subtropical monsoon climate, with a mild and humid climate and four distinctive seasons. During the period from April 2013 to May 2014, four dripping water sites (D3, D4, D10, D11) and one pool water site (DC) have been selected for a long term monitoring in Naduo cave. In order to understand the hydrochemistry, δ13CDICfeatures and their correlation with the cave water, samples of cave water were collected monthly to measure stable carbon isotope and some other geochemical indexes. The result showed that，（1）The cave water is oversaturated to calcite in the monitoring period, which reflects the cave is at the stage of carbonate deposition. The SIc of cave water during rainy season is lower than that in dry season while its PCO2is higher. It is caused mainly by a high concentration of dissolved CO2 in the soil. Under the circumstances of suitable temperature, the precipitation had an important influence on the deposition of speleothems;（2）The water in Naduo cave can respond perfectly to the change of external climate environment. Influenced by the increase of precipitation, the concentration of dissolved CO2 in soil and the activities of plants and microorganism, the δ13CDIC values possess extraordinary seasonal characteristics, lower in summer and higher winter; （3）There is remarkable difference amongδ13CDIC values of cave waters at 5 sampling sites synchronously. Inverse correlation betweenδ13CDIC values of cave water and its corresponding contents of Ca2+, Mg2+, HCO3-, EC and SIc, respectively, has been found in cave waters. These features imply thatδ13CDIC values of cave waters are controlled by soil leaching, bedrock dissolution and prior calcite precipitation (PCP) in different extent. Therefore, the interpretation of δ13CDIC values recorded in speleothems can be more accurate if considering the effects of the above mentioned hydrogeochemical processes.
- Naduo cave of Guizhou Province /
- cave water /
- δ13CDIC /
- hydrochemical characteristics

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