Fluid geochemistry and geothermometry applications of the Kangding high-temperature geothermal system in eastern Himalayas
文献类型：期刊论文
| 作者 | Guo, Qi1,2; Pang, Zhonghe1,2; Wang, Yingchun1,2; Tian, Jiao1,2 |
| 刊名 | APPLIED GEOCHEMISTRY
 |
| 出版日期 | 2017-06-01 |
| 卷号 | 81页码:63-75 |
| 关键词 | High-temperature geothermal system Fluid geochemistry Mixing and degassing processes Geothermometry applications Reservoir temperature |
| ISSN号 | 0883-2927 |
| DOI | 10.1016/j.apgeochem.2017.03.007 |
| 文献子类 | Article |
| 英文摘要 | High-temperature geothermal systems hold an enormous capacity for generating geothermal energy. The Kangding area is a typical high-temperature geothermal field in the Himalayan Geothermal Belt. Hydrogeochemical, gas geochemical and isotopic investigations were performed to identify and qualify the main hydrogeochemical processes affecting thermal water composition, including mixing and degassing, and then to estimate a reliable reservoir temperature. Nine water samples and four geothermal gas samples were collected and analysed for chemical and isotopic components. The results demonstrate the alkaline deep geothermal water is the mixtures of approximately 75% snow-melt water and 25% magmatic water. It is enriched in Na, K, F, Li and other trace elements, indicating the granite reservoir nature. The shallow geothermal water is the mixtures of approximately 30% upward flow of deep geothermal water and 70% meteoric cold water. High concentrations of Ca, Mg and HCO3 indicate the limestone reservoir nature. There is no remarkable oxygen isotope shift in the geothermal water since the rapid circulation is difficult to trigger off strong water-rock interaction. CO2 is the predominant geothermal gas, accounting for more than 97% of total gases in volume percentage. The concentration of CO2 degassing ranged from 0.4 mol L-1 to 0.8 mol L-1 via geothermometrical modelling. As a result, the geothermal water pH increased from 6.0 to 9.0, and approximately 36% of the total SiO2 re-precipitate. The sources of CO2 are the metamorphism of limestone and magmatic degassing based on the composition of carbon isotope. The appropriate geothermometers of Na-K and Na-Li yield reservoir temperature of 280 degrees C. The geothermometrical modelling, developed to eliminate the effects of CO2 degassing, yields temperature of 250 degrees C. The silica-enthalpy mixing model yields temperature of 270 degrees C with no steam separation before mixing. (C) 2017 Elsevier Ltd. All rights reserved. |
| WOS关键词 | HEAT-FLOW DATA ; MINERAL EQUILIBRIA ; CONTINENTAL AREA ; STABLE-ISOTOPES ; WATERS ; CHINA ; TIBET ; RESERVOIRS ; FIELD ; COMPILATION |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000402358600006 |
| 出版者 | PERGAMON-ELSEVIER SCIENCE LTD |
| 资助机构 | National Natural Science Foundation of China(41430319) ; National Natural Science Foundation of China(41430319) ; National Natural Science Foundation of China(41430319) ; National Natural Science Foundation of China(41430319) |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/52881]  |
| 专题 | 地质与地球物理研究所_中国科学院页岩气与地质工程重点实验室 |
| 通讯作者 | Pang, Zhonghe |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Shale Gas & Geoengn, Beijing 100029, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Guo, Qi,Pang, Zhonghe,Wang, Yingchun,et al. Fluid geochemistry and geothermometry applications of the Kangding high-temperature geothermal system in eastern Himalayas[J]. APPLIED GEOCHEMISTRY,2017,81:63-75. |
| APA | Guo, Qi,Pang, Zhonghe,Wang, Yingchun,&Tian, Jiao.(2017).Fluid geochemistry and geothermometry applications of the Kangding high-temperature geothermal system in eastern Himalayas.APPLIED GEOCHEMISTRY,81,63-75. |
| MLA | Guo, Qi,et al."Fluid geochemistry and geothermometry applications of the Kangding high-temperature geothermal system in eastern Himalayas".APPLIED GEOCHEMISTRY 81(2017):63-75. |
入库方式： OAI收割
来源：地质与地球物理研究所
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