INFLUENCE OF RADIOACTIVE HEAT GENERATION WITHIN LITHOSPHERE ON GEOTHERMAL HISTORY OF EXTENSIONAL BASIN
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摘要: 恢复盆地地热史是盆地模拟中的一个重要部分。目前,用地球物理方法恢复拉张盆地的地热史都忽略了岩石圈放射性元素生热的影响。本文中,我们研究了放射性元素的生热效应模式,给出地热史和沉降史计算公式,发现放射性元素的生热效应对地热史影响很大,不能忽略。用这些公式恢复苏北盆地一口井的古热流和古地温,并模拟镜质体反射率(R°),与实测值吻合较好。同时,用不含生热效应的模式恢复该井的热流,则与实测值相差很大。所以,用地球物理方法恢复大陆内部拉张盆地的地热史不能忽略岩石圈内放射性元素的生热效应,必须用含放射性元素生热率的地热史模式。Abstract: The restoration of geothermal history is one of important parts in basin modelling. However, in present analysis on geotherms of extensional basins by geophysical techniques, the influence of radioactive heat generation within the lithosphere is neglected in general. In this paper, therefore, a model of heat generation by radioactive elements of the lithosphere is developed and formulae for geothermal history and subsidence history are proposed. A fact is obvious that the geothermal history of extensional basins is much affected by the heat generation of radioactive elements, therefore, it can not be overlooked in the analysis of the geothermal evolution of extensional basins.
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