The Lesser Caucasus hosts a variety of ore deposits that formed during successive geodynamic settings and have so far received only little attention in Western literature. Three metallogenic events have been distinguished and range in age from Middle Jurassic to Neogene. This thesis describes in detail ore deposits in the Lesser Caucasus, which formed during the earliest metallogenic event and are hosted by Middle Jurassic rocks. Based on field observations, ore and gangue mineral assemblages, alteration styles and stable and radiogenic isotope analyses, an intrusion-related scenario is proposed for the studied ore deposits with intermediate to high sulfidation state, whereas the involvement of seawater during ore-forming processes cannot be generally discarded in some of the deposits. Geochemical, geochronological, mineralogical and isotopic data of Mesozoic to Cenozoic igneous rocks from different parts of the Lesser Caucasus suggests that similar petrogenetic and ore-forming processes operated along the entire axis of the Lesser Caucasus magmatic arc.