Studying hydrothermal systems in basement environments requires knowledge of fault and fracture network distributions. This study addresses this through multi-scale structural analysis of the Têt fault and its surrounding fracture systems (Eastern Pyrénées) using remote sensing and field data. This study aims to achieve this through: 1) precisely mapping and describing the brittle fault network, 2) analysing the distribution of lineaments and outcrop-scale fractures related to these faults, 3) making comparisons to fault-kinematic evidence combined in a new regional review, 4) examining the relations between fractures features and lithology, 5) applying statistical analysis to highlight relations between different scales of deformation. The complex fault network is inherited from consecutive tectonic stages (Hercynian, Pyrenean compression, Neogene extension) and has been reactivated since the middle-Miocene. NE–SW secondary faults are abundant at the regional scale, even away from the Têt fault. Major NW–SE faults are constituted by 10s-m wide brittle core zones, and NW–SE secondary faults are concentrated around the Têt fault, attesting that they had formed at shallow crust levels after the Oligo-Miocene extension. N–S fractures, formed during Pyrenean compression, are part of the background fracturing and are scattered throughout the study area. Intersections of fault and fracture networks provide efficient permeable pathways for meteoric and hydrothermal fluids. Finally, a dislocation model reveals a lithological control on fracture apertures in crystalline rocks, which appears more preserved at depth than in metasediments. All of these elements are integrated in a global model of the hydrothermal system establishment in accordance with the faulting sequence, with the damage distribution and with the lithology. This distributed fault system could represent the surface expression of the crustal thinning revealed by recent geophysical data. The realized identification of the lithological and structural characteristics of the surrounding mountains, allowing hydrothermal circulation to establish itself, provides a better understanding of the orogenic-belt related hydrothermal systems necessary to the geothermal exploration.

在地下室环境中研究热液系统需要了解断层和裂缝网络分布。这项研究通过使用遥感和现场数据对Têt断层及其周围的断裂系统（东比利牛斯）进行多尺度结构分析来解决这一问题。本研究旨在通过以下方式实现这一目标：1）精确地绘制和描述脆性断层网络； 2）分析与这些断层有关的构造和露头尺度裂缝的分布； 3）与在新区域组合的断层运动学证据进行比较综述； 4）检查裂缝特征与岩性之间的关系； 5）应用统计分析突出显示不同变形尺度之间的关系。复杂的断层网络继承自连续的构造阶段（海西期，比利牛斯山压缩，自新中中期以来已重新激活。NE-SW次生断层在区域范围内十分丰富，甚至远离Têt断层。NW-SE主要断层由10s-m宽的脆性岩心带构成，NW-SE次生断层集中在Têt断层周围，证明它们是在中低新统伸展之后形成于浅层地壳的。在比利牛斯山脉压裂过程中形成的N–S裂缝是背景裂缝的一部分，并散布在整个研究区域。断层和裂缝网络的交叉点为陨石和热液流体提供了有效的渗透途径。最后，一个位错模型揭示了对晶体岩石裂缝孔的岩性控制，该裂缝在深度上比在沉积物中保存得更多。所有这些要素都根据断层顺序，破坏分布和岩性被整合到热液系统建立的全局模型中。这种分布的断层系统可以代表最近地球物理数据揭示的地壳变薄的表面表达。对周围群山的岩性和结构特征的实际识别，使热液循环得以建立，可以更好地了解与地热带相关的地热勘探相关的热液系统。这种分布的断层系统可以代表最近地球物理数据揭示的地壳变薄的表面表达。对周围群山的岩性和结构特征的实际识别，使热液循环得以建立，可以更好地了解与地热带相关的地热勘探相关的热液系统。这种分布的断层系统可以代表最近地球物理数据揭示的地壳变薄的表面表达。对周围群山的岩性和结构特征的实际识别，使热液循环得以建立，可以更好地了解与地热带相关的地热勘探相关的热液系统。