不同类型地热水硼的地球化学特征及对地热系统成因机制的指示

尚建波; 卫兴; 曹园园; 师红杰; 刘明亮

doi:10.19509/j.cnki.dzkq.tb20230156

不同类型地热水硼的地球化学特征及对地热系统成因机制的指示

doi: 10.19509/j.cnki.dzkq.tb20230156

1.
长江大学油气地球化学与环境湖北省重点实验室&资源与环境学院, 武汉 430100
2.
宁夏回族自治区地球物理地球化学勘察院, 银川 750001

基金项目:

宁夏回族自治区重点研发计划项目 2022BEG03060

国家自然科学基金项目 41902257

自然资源部深部地热资源重点实验室开放基金项目 KLDGR2022G01

宁夏回族自治区财政专项项目 NXCZ20220206

地热资源勘查与开发利用山西省重点实验室开放基金项目 SX202205

详细信息

作者简介:
尚建波, E-mail: shangjianbo6406@163.com

通讯作者:
曹园园, E-mail: baiheyueeryuan1@163.com

中图分类号: P641.3
计量
- 文章访问数: 155
- PDF下载量: 34
- 被引次数: 0
出版历程
- 收稿日期: 2023-03-23
- 录用日期: 2023-05-07
- 修回日期: 2023-04-28

Boron geochemical characteristics in different types of geothermal water and its indications for the genesis mechanism of geothermal systems

1.
Hubei Key Laboratory of Petroleum Geochemistry and Environment & College of Resources and Environment, Yangtze University, Wuhan 430100, China
2.
Geophysical and Geochemical Exploration Institute of Ningxia Hui Autonomous Region, Yinchuan 750001, China

More Information

Author Bio:
SHANG Jianbo, E-mail: shangjianbo6406@163.com

Corresponding author: CAO Yuanyuan, E-mail: baiheyueeryuan1@163.com

摘要

摘要:
硼是地热流体中较为保守的元素，经常伴随地热系统出现，研究其来源对揭示不同类型地热系统成因机制有重要作用。分别选取了我国高温与中低温地热系统中较为典型且具有异常高硼浓度的西藏搭格架和宁夏银川盆地地热系统，研究了不同类型地热系统地热水中硼的来源及其相关的地球化学过程。结果表明搭格架中性和弱碱性地热水中硼主要来源于围岩的溶滤与岩浆流体的贡献，搭格架酸性地热水中的硼则主要来源于地下浅层冷水的输入；而银川地热水中硼则主要来源于深层古沉积水的补给。在此基础上，结合区域地质背景及地热水的水化学特征，讨论了不同类型地热系统的成因机制。研究结果表明，地热水中硼的地球化学特征具有识别不同类型地热系统成因机制的潜力。
- 硼 /
- 地热系统 /
- 地热水 /
- 成因机制 /
- 岩浆热源 /
- 古沉积水
Abstract: Objective
Boron is a relatively conservative element in geothermal fluids that often accompanies geothermal systems, and its origin plays an important role in revealing the genesis mechanisms of different types of geothermal systems.
Methods
In this study, the geothermal systems of the Daggyai in Tibet and the Yinchuan Basin in Ningxia were selected for investigating the source of boron in geothermal water and its related geochemical processes in different types of geothermal systems. These study areas are typical of high-temperature and medium-low-temperature geothermal systems in China, and both have extremely high boron concentrations.
Results
Results showed that the boron in the neutral/weakly alkaline geothermal water of the Daggyai was primarily contributed by dissolution filtration of the surrounding rocks and magmatic fluid input, while the boron in the acidic geothermal water was primarily contributed by the input of shallow cold water from the subsurface. Boron in the geothermal water of Yinchuan primarily originated from the recharge of deep paleosedimentary water. On this basis, the genetic mechanisms of different types of geothermal systems were discussed by combining the regional geological background and the hydrochemical characteristics of geothermal water.
Conclusion
This study suggests that the geochemical characteristics of boron in geothermal water have the potential to identify the genesis mechanisms of different types of geothermal systems.
- boron /
- geothermal systems /
- geothermal water /
- genetic mechanism /
- magmatic heat source /
- paleosedimentary water
注释:

所有作者声明不存在利益冲突。

HTML全文

图 1 研究区地质简图及采样点分布图(图a据文献[25]修改；图b据文献[9]修改；图c据文献[24]修改)

Figure 1. Simplified geological map of the study areas and sampling locations

下载: 全尺寸图片幻灯片

图 2 研究区地热水样Piper三线图

Figure 2. Piper plot of geothermal water samples in the study areas

下载: 全尺寸图片幻灯片

图 3 地热水样B, As, SO₄^2-, Ca²⁺, Cl^-, Br^-质量浓度箱型图

Figure 3. Box and whisker plots of B, As, SO₄^2-, Ca²⁺, Cl^- and Br^- concentrations of the geothermal water samples

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图 4 搭格架中性、弱碱性地热水样B与As相关图(a)、银川盆地地热水样B与Br相关图(b)

Figure 4. Plots of B vs As of neutral and weakly alkaline geothermal water samples from Daggyai(a), and plots of B vs Br of geothermal water samples from the Yinchuan Basin(b)

下载: 全尺寸图片幻灯片

图 5 研究区地热水样Na-K-Mg^1/2三角图

Figure 5. Triangular diagram of Na-K-Mg^1/2 of geothermal water samples in the study areas

下载: 全尺寸图片幻灯片

图 6 西藏搭格架地热系统(a)与银川盆地地热系统(b)成因机制概念模型

Figure 6. Conceptual model for illustrating the geneses of Daggyai, Tibet (a) and Yinchuan Basin (b)

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图 7 银川盆地地热水样Na/Cl与TDS相关图(a)、Cl/Br与Cl相关图(b)

Figure 7. Plots of Na/Cl vs TDS of geothermal water samples from the Yinchuan basin(a), and plots of Cl/Br vs Cl of geothermal water samples from the Yinchuan Basin(b)

下载: 全尺寸图片幻灯片

表 1 研究区水化学特征

Table 1. Hydrochemical characteristics of the study area

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