| 喜马拉雅东构造结地区地热成因分析 |
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| 引用本文： | 马鑫,付雷,李铁锋,闫晶,刘廷,王明国,邵炜.喜马拉雅东构造结地区地热成因分析[J].现代地质,2021,35(1):209-219. |
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| 作者姓名： | 马鑫 付雷 李铁锋 闫晶 刘廷 王明国 邵炜 |
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| 作者单位： | 1. 中国地质调查局 水文地质环境地质调查中心,河北 保定 0710512. 中国冶金地质总局 地球物理勘查院,河北 保定 071051 |
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| 基金项目： | 中国地质调查局地质调查项目(DD20190534)。 |
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| 摘 要： | 喜马拉雅东构造结地区是现今地球上构造活动最强烈、地貌演化最快的地区之一,属于地中海—喜马拉雅地热带,水热活动强烈。基于喜马拉雅东构造结的地热地质背景,采用野外调查、水化学和稳定同位素测试分析等手段,初步分析嘉黎地区深部地下热水发育特征及成因模式。结果表明,该区域地下热水均来自大气降水或冰雪融水,补给高程位于4 500 m以上,推测补给区位于研究区西北部片麻岩山区;区内地下热水均为未成熟水,热水补给水源沿断裂循环至深部热储,随后受热对流上升至地表出露成温泉,热水上升至浅表部与冷水发生混合,冷热水最大混合比可达91%;采用二氧化硅温度计、阳离子温度计以及硅-焓模型估算出热储温度最高达380 ℃,热水在雅鲁藏布江结合带内循环深度达到6 900 m。研究区深部热源主要来自雅鲁藏布江结合带及附近深大断裂,地表热显示主要受控于结合带两侧的次级张扭性断裂。本研究初步揭示了喜马拉雅东构造结嘉黎地区地热成因模式,可为该区重大工程建设和高温热害防治提供指导。
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| 关 键 词： | 地热成因 水文地球化学 热储温度 循环机制 喜马拉雅东构造结 |
| 收稿时间： | 2020-10-09 |
| 修稿时间： | 2020-12-14 |
Analysis of Geothermal Origin in Eastern Himalayan Syntaxis |
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| MA Xin,FU Lei,LI Tiefeng,YAN Jing,LIU Ting,WANG Mingguo,SHAO Wei.Analysis of Geothermal Origin in Eastern Himalayan Syntaxis[J].Geoscience——Journal of Graduate School,China University of Geosciences,2021,35(1):209-219. |
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| Authors: | MA Xin FU Lei LI Tiefeng YAN Jing LIU Ting WANG Mingguo SHAO Wei |
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| Institution: | 1. Center for Hydrogeology and Environmental Geology Survey, China Geological Survey, Baoding,Hebei 071051, China2. Geophysical Exploration Academy of China Metallurgical Geology Bureau, Baoding,Hebei 071051, China |
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| Abstract: | The eastern Himalayan syntaxis is one of the regions with the strongest tectonic activity and the fastest geomorphic evolution on the Earth.It belongs to the Mediterranean-Himalayan tropics with strong hydrothermal activities.Based on the geological background,the development characteristics and genetic model of the deep underground hot water at Jiali are preliminarily explored through field survey,hydrochemical and stable isotope analyses.The results show that the origin of local geothermal water comes from meteoric precipitation or ice/snow melting,and the recharge altitude is above 4,500 m.It is speculated that the recharge area is located in the mountainous gneissic region in the northwest of the study area.The geothermal water in the area is immature.The geothermal water replenishment source circulates along the faults to the deep thermal reservoir,and then ascends by heating and convection until it is exposed as hot springs.The geothermal water rises to the shallow surface and mixes with cold water at a mixing ratio reaching 91%.SiO2 thermometer,cation thermometer and silicon-enthalpy models are used to estimate the reservoir temperature,and the maximum reservoir temperature is 380℃.The depth of geothermal water circulation reaches 6,900 m in the Yarlung-Zangbo River junction zone.The local geothermal heat source comes mainly from the Yarlung-Zangbo River junction zone and the nearby deep faults,and the surface geothermal springs are mainly controlled by the secondary tensile and torsional faults on both sides of the junction zone.This study preliminarily revealed the geothermal genetic model at Jiali of the eastern Himalayan syntaxis,which can provide a scientific basis for the geothermal resource development and utilization,and for the planning and construction of major projects in the area. |
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| Keywords: | geothermal origin hydrogeochemistry reservoir temperature circulation mechanism easternHimalayan syntaxis |
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