This work deals with the hydrocarbon-bearing barite-polymetallic mineralizations of the Colipilli area, located in the western sector of the Agrio Fold and Thrust Belt (Neuquén Basin, Argentina). The mineralizations consist of bed- and vein-type deposits mainly composed of barite (barite_96.99%–celestine_2.93%) with minor amounts of Fe-oxyhydroxides and sulfides. The bed-type deposits have zebra texture and are emplaced along the contact between Late Cretaceous–Paleocene igneous rocks (Naunauco Group) and their Early Cretaceous sedimentary host rocks (e.g., Huitrín Formation). In contrast, the vein-type deposits have breccia texture and are crosscutting the Mulichinco, Agrio and Huitrín formations or the andesitic/dioritic stocks and sills of the Naunauco Group. Different types and families of primary fluid inclusions (FI) were identified in the barite crystals. Fluorescence techniques with UV incident light and Raman spectroscopy allowed FI from completely aqueous to completely organic, including all the intermediate terms, to be identified. The organic FI have blue fluorescence and contain liquid hydrocarbons. The blue fluorescence is correlated with medium to high API gravity values (ca. 40°), indicating the presence of light hydrocarbons of advanced maturity related with the window for the generation of liquid/gaseous hydrocarbons. Microthermometry studies carried out on aqueous FI revealed that vein-type deposits formed at higher temperatures and salinities (249.7 °C and 0.5–9.3 wt % NaCl equivalent) than bed-type deposits (162.2 °C and 0.2–7.2 wt % NaCl equivalent). The heat influx provided by the Late Cretaceous–Paleocene magmatism promoted the circulation of inorganic and organic fluids of connate origin and the leaching of metallic and non-metallic elements from the sedimentary pile. During its crystallization, barite trapped fluids with variable hydrocarbon contents. The thermal anomaly associated with the magmatic activity could also have contributed with the maturation of the nearby source rocks and to the development of an atypical petroleum system.

这项工作涉及位于阿格里奥褶皱和冲断带西部地区（阿根廷新奎恩盆地）的Colipilli地区含烃的重晶石-多金属矿化。矿化层由床型和脉型矿床组成，主要由重晶石（重晶石_96.99％-硅藻土_2.93％）以及少量的氢氧化铁和硫化物组成。床型沉积物具有斑马纹纹理，并沿白垩纪-古新世火成岩（Naunauco Group）与其早白垩纪沉积宿主岩（例如，，惠特林组）。相比之下，脉型矿床具有角砾岩质地，并且横穿了瑙努科集团的Mulichinco，Agrio和Huitrín地层或安山岩/异闪岩储层和基石。在重晶石晶体中鉴定出不同类型和种类的一次生流体包裹体（FI）。带有紫外线入射光和拉曼光谱的荧光技术使FI从完全含水到完全有机（包括所有中间术语）得以鉴定。有机FI具有蓝色荧光并且包含液态烃。蓝色荧光与中到高的API比重值（相关约40°），表明存在与生成液/气烃的窗口有关的提前成熟的轻烃。在水性FI上进行的显微热分析研究表明，与床型沉积物（162.2°C和0.2–7.2 wt％NaCl当量）相比，在较高温度和盐度（249.7°C和0.5–9.3 wt％NaCl当量）下形成的静脉型沉积物。晚白垩世-古新世的岩浆作用所产生的热量涌入促进了天然的无机和有机流体的循环以及沉积桩中金属和非金属元素的浸出。在结晶过程中，重晶石捕获了碳氢化合物含量可变的流体。