Metallogenic models of polyphase mountain belts critically rely on robust geochronology. We combine petrology with Rb–Sr and U–Th–Pb in situ geochronology, paired at thin-section scale, to date mineralization in deformed hydrothermal Pb–Zn–Ag deposits along an east-west transect in the Western Alps, France. The Pb–Zn–Ag veins occur in shear zones with kinematic structures consistent with the mylonitized host rocks. The ore consists mainly of galena in a quartz-phengite gangue. The paragenesis can be related to hydrothermal crystallization during periods of variable strain. Both isotope systems yield only Cenozoic ages (ca. 35 Ma and 15–20 Ma) without any pre-Alpine inheritance, clearly indicating orogenic mineralization. The metallogenic model proposed here includes significant fluid circulation along major tectonic contacts between basement and sedimentary cover during Alpine convergence.

中文翻译：

---

西阿尔卑斯山新生代铅锌银矿化

多相山带的成矿模型严重依赖于可靠的地质年代学。我们将岩石学与 Rb-Sr 和 U-Th-Pb 原位地质年代学相结合，在薄片尺度上配对，迄今为止，法国西阿尔卑斯山东西向横断面变形热液 Pb-Zn-Ag 矿床的矿化情况。 Pb-Zn-Ag 矿脉出现在剪切带中，其运动结构与糜棱岩化的主岩一致。该矿石主要由石英白硅白云石脉石中的方铅矿组成。共生可能与可变应变期间的热液结晶有关。两种同位素系统仅得出新生代年龄（约 35 Ma 和 15-20 Ma），没有任何前阿尔卑斯山遗传，清楚地表明造山成矿作用。这里提出的成矿模型包括阿尔卑斯山辐合期间沿基底和沉积盖层之间主要构造接触面的显着流体循环。