Classification schemes for geothermal energy sources have recently been improved to include the concept of geothermal play. Our comprehensive review for the island of Madagascar aims to enhance the understanding of the factors controlling the country’s geothermal energy sources. The result is the first catalogue of geothermal systems in Madagascar. The geothermal systems of six prospective areas were categorized into three classes using the geological and tectonic context combined with the temperature of the potential geothermal reservoir. The three classes are (1) graben border-fault liquid-dominated moderate-temperature (Ambilobe and Miandrivazo areas), (2) fossil magmatic liquid-dominated moderate-temperature (Ambanja, Itasy and Antsirabe areas), and (3) sedimentary liquid-dominated low-temperature (Morondava Basin). The hydrothermal resources of Madagascar are commonly associated with extensional domains referred to as geothermal plays. A conceptual model was developed for each prospective area to better understand the factors controlling the heat source, formation permeability and fluid migration. Our results can be used to guide exploration strategies and have implications for assessing and quantifying Madagascar’s geothermal potential.

中文翻译：

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马达加斯加的地热系统分类

最近，对地热能源的分类方案进行了改进，以包括地热活动的概念。我们对马达加斯加岛的全面审查旨在增进对控制该国地热能源来源的因素的了解。结果是马达加斯加首次建立了地热系统目录。利用地质和构造背景以及潜在地热储层的温度，将六个潜在地区的地热系统分为三类。这三类是（1）边界断裂液主导的中温带（Ambilobe和Miandrivazo地区），（2）岩浆岩浆主导的中温带（Ambanja，Itasy和Antsirabe地区）和（3）沉积液主导的低温（Morondava盆地）。马达加斯加的热液资源通常与被称为地热岩层的延伸域相关。为每个预期地区开发了一个概念模型，以更好地了解控制热源，地层渗透率和流体运移的因素。我们的结果可用于指导勘探策略，并对评估和量化马达加斯加的地热潜力具有启示意义。