Due to its geodynamic location in the Lesser Antilles arc, Basse-Terre of Guadeloupe displays an active volcanism which is favourable to the development of high-enthalpy geothermal energy. An exhumed analogue of the Bouillante geothermal reservoir has been recently characterized in Terre-de-Haut island (Les Saintes archipelago), giving an opportunity to study the cooling of a natural geothermal system and the related alterations.

By coupling chlorite geothermometry and primary fluid inclusions in associated zoned quartz crystals located in N70 trending fractures, new insights on the Terre-de-Haut paleo-geothermal evolution can be inferred by distinguishing three new different episodes during functioning and cooling of this system: (i) a temperature of at least 240–270 °C in fluid inclusions trapped in the quartz core, (ii) chlorite formation at about 120 °C, and (iii) temperatures of ~50 °C - or less - in fluid inclusions of the quartz outer growth zones. Fluid inclusions also reveal that the hydrothermal fluid is of low salinity (2 wt% NaCl), probably of meteoric and sea water origin. Additionally, a second type of fluid inclusions observed in a banded quartz vein indicates at least an episode of a CO₂-(H₂O) fluid, with traces of H₂S. Hence, some similarities can be highlighted between Terre-de-Haut and the Bouillante active geothermal systems in term of the highest temperatures of circulation events and gas composition, despite a difference in fluid origin. This study shows that some alteration episodes also occur at low temperature during the cooling of the geothermal system. Moreover, the N70 trending fractures, that have been identified as drains for the hot temperature fluids, have to be considered for future geothermal exploration.

由于位于小安的列斯群岛弧的地球动力学位置，瓜德罗普岛的 Basse-Terre 显示出活跃的火山活动，有利于高焓地热能的开发。最近在 Terre-de-Haut 岛（Les Saintes 群岛）发现了一个类似 Bouillante 的地热储层，这为研究自然地热系统的冷却和相关变化提供了机会。

通过将绿泥石地质测温法和位于 N70 走向裂缝的相关分带石英晶体中的原生流体包裹体相结合，可以通过区分该系统运行和冷却过程中的三个新的不同事件来推断出关于 Terre-de-Haut 古地热演化的新见解：（ i) 捕获在石英核中的流体包裹体中的温度至少为 240–270 °C，(ii) 在约 120 °C 时形成绿泥石，以及 (iii) 约 50 °C 的温度 - 或更低 - 的流体包裹体中石英外生长区。流体包裹体还表明热液的盐度低（2 wt% NaCl），可能来自大气和海水。此外，在带状石英脉中观察到的第二种流体包裹体表明，至少有一次 CO ₂ -(H ₂O) 流体，带有 H ₂ S 的痕迹。因此，尽管流体来源不同，但在环流事件和气体成分的最高温度方面，Terre-de-Haut 和 Bouillante 活跃地热系统之间有一些相似之处。这项研究表明，在地热系统冷却过程中，低温下也会发生一些蚀变事件。此外，N70 走向的裂缝已被确定为高温流体的排放口，必须考虑用于未来的地热勘探。