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。
[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.
作者
尚建波
卫兴
曹园园
师红杰
刘明亮
SHANG Jianbo;WEI Xing;CAO Yuanyuan;SHI Hongjie;LIU Mingliang(Hubei Key Laboratory of Petroleum Geochemistry and Environment&College of Resources and Environment,Yangtze University,Wuhan 430100,China;Geophysical and Geochemical Exploration Institute of Ningxia Hui Autonomous Region,Yinchuan 750001,China)
出处
《地质科技通报》
CAS
CSCD
北大核心
2024年第1期288-297,共10页
Bulletin of Geological Science and Technology
基金
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)。
关键词
硼
地热系统
地热水
成因机制
岩浆热源
古沉积水
boron
geothermal systems
geothermal water
genetic mechanism
magmatic heat source
paleosedimentary water
