| 西藏日喀则市查孜地热田地质构造特征与形成机制 |
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| 引用本文： | 罗绍强,男达瓦,李欢,成福君,格桑平措,洛松群培.西藏日喀则市查孜地热田地质构造特征与形成机制[J].四川地质学报,2020,40(1):30-33. |
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| 作者姓名： | 罗绍强 男达瓦 李欢 成福君 格桑平措 洛松群培 |
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| 作者单位： | 四川省地质矿产勘查开发局川西北地质队,四川绵阳 621000;西藏自治区地质矿产勘查开发局地热地质大队,拉萨850032 |
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| 基金项目： | 西藏自治区矿产资源勘查专项资金项目:西藏自治区日喀市地热资源调查与评价(藏矿勘﹝2018﹞01号)。 |
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| 摘 要： | 查孜地热田位于冈底斯-念青唐古拉断块隆起区之当惹雍错-许如错南北向地堑区,区内岩浆岩分布较为广泛,活动性断裂较为发育,拥有形成地热的良好地质条件。结合区域地质背景和地热田地质及地球物理场的研究成果,分析了查孜地热田地热资源的形成背景、赋存条件和分布规律。研究表明,地热田的热储层为古近纪古-始新统火山岩。大气降水及融雪水的入渗补给为地热水提供了丰富的水源,活动性断裂构成了地热水深循环的通道,广泛分布的岩浆岩体为地热水提供热能来源,本区地下热水的成因类型可划归为岩浆岩-构造断裂型。
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| 关 键 词： | 查孜地热田 岩浆岩 活动断裂 形成机制 |
Geological Structure Characteristics and Genetic Mechanism of the Cazê Geothermal Field in Xikazê, Tibet |
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| Institution: | (Northwest Sichuan Geological Party,BGEEMRSP,Mianyang,Sichuan 621000;Geothermal and Geological Team,Geological and Mineral Exploration and Development Bureau of Tibet Autonomous Region,Lhasa 850032) |
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| Abstract: | The Cazê geothermal field is located in the NS-trending Tangra Yumco – Xuru Co graben of the Gangdisê – Nyainqêntanglha fault block where magmatite are widely exposed and active faults are developed. Based on the research results of regional geological setting and geological and geophysical fields of the geothermal field, this paper has a discussion on formation background, occurrence conditions and distribution rules of the Cazê geothermal field. The study results show that the thermal reservoir of the geothermal field is volcanic rock during Paleocene-Eocene epoch. Atmospheric precipitation and snowmelt water supply provide abundant water sources for the geothermal field, while active faults form the deep circulation channels of geothermal water, and widespread magmatite masses provide thermal energy for the geothermal water. The genetic type of the underground thermal water in this area belongs to magmatite-tectonic fault type. |
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| Keywords: | Caze geothermal field fault basin active fault genetic mechanism |
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