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Water geochemistry of rivers draining karst-dominated regions, Guangxi province, South China: Implications for chemical weathering and role of sulfuric acid

文献类型：期刊论文

作者Jiang, Hao1,2,4; Li, Wenjing1,2,3,4; Zhao, Tong1,2,4; Sun, Huiguo1,2,4; Xu, Zhifang1,2,3,4
刊名JOURNAL OF ASIAN EARTH SCIENCES
出版日期2018-09-01
卷号163页码:152-162
关键词Water chemistry Chemical weathering Sulfuric acid CO2 budget
ISSN号1367-9120
DOI10.1016/j.jseaes.2018.05.017
英文摘要Guangxi province, located in South China, is a typical karst region affected by acid depositions for a couple of decades. Water samples from the major river basins in this region were collected and the chemical compositions were measured with a main purpose to quantify chemical weathering rates and associated CO2 budget. The average total dissolved solids (TDS) of the river waters (232 mg/l) are comparable with other karstic rivers. The major ion compositions of the river waters are characterized by the dominance of Ca2+, Mg2+, HCO3-, and are significantly rich in SO42-. The chemical compositions of the river waters indicate that four major reservoirs (atmospheric, anthropogenic, carbonate and silicate inputs) contribute to the dissolved loads. The carbonate chemical weathering rates range from 61.4 t/km(2)/yr for the Qingshuihe river basin to 93.3 t/km(2)/yr for the Zuojiang river basin. The silicate chemical weathering rates range from 2.9 t/km(2)/yr for the Qingshuihe river basin to 7.9 t/km(2)/yr for the Liujiang river basin. The CO2 consumption rates by carbonate weathering range from 559 x 10(3) mol/km(2)/yr for the Qingshuihe river basin to 817 x 10(3) mol/km(2)/yr for the Zuojiang river basin. The CO2 consumption rates by silicate weathering range from 19 x 10(3) mol/km(2)/yr for the Zuojiang river basin to 85 x 10(3) mol/km(2)/yr for the Liujiang river basin. Sulfuric acid is involved as a proton donor in weathering reactions, and about 9-15% of the chemical weathering rates of the river basins are sulfuric acid-induced. The CO2 consumption rates are only 85-91% of the value when assuming carbonic acid provides all the protons in the weathering reactions. The CO2 released from sulfuric acid-induced carbonate weathering would exceed the CO2 consumed by silicate weathering, making the river basins in Guangxi net CO2 sources on geological timescales. The total net CO2 releasing flux is approximately 15.7 x 10(9) mol/yr (0.19 x 10(12) gC/yr). This result quantitatively highlights the fact that CO2 budget by chemical weathering will be largely modified by sulfuric acid, especially in seriously acid deposition affected region.
WOS关键词QINGHAI-TIBET PLATEAU ; ATMOSPHERIC CO2 ; DISSOLVED-LOAD ; XIJIANG RIVER ; ANTHROPOGENIC IMPACTS ; PHANEROZOIC TIME ; BASIN RIVERS ; CONSUMPTION ; CARBONATE ; STRONTIUM
资助项目National Natural Science Foundation of China[91747202] ; National Natural Science Foundation of China[41730857] ; National Natural Science Foundation of China[41173114] ; National Natural Science Foundation of China[41673020]
WOS研究方向Geology
语种英语
WOS记录号WOS:000439673400012
出版者PERGAMON-ELSEVIER SCIENCE LTD
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
源URL[http://ir.iggcas.ac.cn/handle/132A11/94010]  
专题地质与地球物理研究所_中国科学院新生代地质与环境重点实验室
通讯作者Xu, Zhifang
作者单位1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
2.Chinese Acad Sci, Inst Earth Sci, Beijing 100029, Peoples R China
3.CAS Ctr Excellence Life & Paleoenvironm, Beijing 100044, Peoples R China
4.Chinese Acad Sci, Key Lab Cenozo Geol & Environm, Inst Geol & Geophys, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 Jiang, Hao,Li, Wenjing,Zhao, Tong,et al. Water geochemistry of rivers draining karst-dominated regions, Guangxi province, South China: Implications for chemical weathering and role of sulfuric acid[J]. JOURNAL OF ASIAN EARTH SCIENCES,2018,163:152-162.
APA Jiang, Hao,Li, Wenjing,Zhao, Tong,Sun, Huiguo,&Xu, Zhifang.(2018).Water geochemistry of rivers draining karst-dominated regions, Guangxi province, South China: Implications for chemical weathering and role of sulfuric acid.JOURNAL OF ASIAN EARTH SCIENCES,163,152-162.
MLA Jiang, Hao,et al."Water geochemistry of rivers draining karst-dominated regions, Guangxi province, South China: Implications for chemical weathering and role of sulfuric acid".JOURNAL OF ASIAN EARTH SCIENCES 163(2018):152-162.

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来源：地质与地球物理研究所

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