地热流体气相成分对构造环境的指示作用
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摘要
综述了地热流体中气体及其同位素组成对构造环境指示作用研究的若干新进展。把已有研究方法划分为:①w3He/w4He单组分比值法;②双组分对比法;③多组分综合图解法。根据对贝加尔裂谷带和秦巴地区某些地下热水氦同位素特征的研究,提出陆内下地壳深大断裂的地下热水w3He/w4He值为大气w3He/w4He值的0.3~0.5倍,并认为这些地热流体是介于典型壳源型和消减带型之间的一种过渡类型
Some recent advances in the study of gases and their isotopes in geothermal fluids that are indicative of their tectonic environment are reviewed.The existing evidences can be divided into three groups:w3He/w4He ratio;a comparison of two related components;trilinear diagrams of multiple components.According to helium isotope data of thermal groundwaters from the Baikal Rift Zone(Russia)and the Qingba Orogenic Belt(China),the w3He/w4He ratio of thermal waters effervescing along deep faults cutting down to the lower crust is proposed to be in the range of(0.3~0.5)Ra(the w3He/w4He ratio of air),an intermediate range between the w3He/w4He ratio of typical crustal origin and that of subduction zones.
引文
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