Source of Hydrochemical Composition and Formation Mechanism of Rehai Geothermal Water in Tengchong
Source of Hydrochemical Composition and Formation Mechanism of Rehai Geothermal Water in Tengchong
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发表时间：
2014
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通讯作者：
Liu Ming-lian
中科院分区：
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作者：
Liu Ming-lian
热海是腾冲热液活动最活跃的地温区，其特征是温泉、喷气孔、蒸汽地和烧结矿分布众多。本研究对13份地热水样品的化学成分进行了r聚类分析。这些水化学指标可分为A型和b型两类。A型包括Cl、Na、K、Li、Rb、Cs、F、SiO2和As，是热海温泉的特征成分。其中Cl、B和As主要来源于岩浆脱气，Li、Na、K、Rb、Cs和SiO2主要来源于地热流体与地下岩石的相互作用。F是独特的，因为它可能受到岩浆脱气和水岩相互作用的影响。B型由Ca、Mg、Sr和SO2-4组成，冷地下水的混合是其主要来源之一。根据热海中性泉和酸性泉的水化学特征，分析了热海中性泉和酸性泉的形成机理。提出了热海地热系统形成的概念模型。
Rehai,ageothermal area with the most active hydrothermal activity in Tengchong,is characterized by occurrence of numerous hot springs,fumaroles,steaming ground and sinter.In this study,R-cluster analysis of the chemical composition of 13 geothermal water samples is made.These hydrochemical indices can be divided into two groups:type A and type B.Type A includes Cl,Na,K,Li,Rb,Cs,F,SiO2 and As,which are the characteristic constituents of the Rehai hot springs.Among these constituents,Cl,B and As are primarily derived from magma degassing,while Li,Na,K,Rb,Cs and SiO2 from the interactions between geothermal fluids and subsurface rocks.F is unique because it may be affected by both magma degassing and water-rock interactions.Type B is composed of Ca,Mg,Sr and SO2-4,the mixing of cold groundwaters being one of the major sources of them.Based on their hydrochemical characteristics,the formation mechanisms of both neutral and acid springs discharged from Rehai are analyzed.A conceptual model for illustrating the formation of the Rehai geothermal system is put forward as well.