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Organic and inorganic geochemistry of Ljubija mineral deposits, NW Bosnia

The Ljubija mineral deposits are within Sana-Una river Palaeozoic terrain, Inner Dinarides. Mineralization is represented by Fe carbonates, sulfides, barite and fluorite. Fe-mineralization in form of siderite and ankerite replacement in limestones and siderite-sulphide veins placed within dark coloured clastites is represented by 1) Dark massive siderite and ankerite ; 2) Zebra siderite consisted of dark massive and light sparry siderite and 3) Siderite veins with sulfides and quartz. Formation temperatures of dark massive siderite (224°C), zebra siderite (245°C) and vein siderite (168°C) are estimated on basis of stable isotope geothermometry. Stable carbon isotopes and distribution of REEs point to metasomatical origin of dark massive siderite and ankerite and zebra siderite. Siderite veins are related to later phase of mineralization. Sulfur isotope compositions of mineralizing fluid suggest Permian seawater or Permian evaporites as the main sulfur source. The molar composition of the fluids leached from ore and gangue minerals plotted along the "evaporation trend" proved Permian age of Fe-mineralization. Organic geochemistry investigations on barren and mineralized samples suggest that organic matter did not have active role during mineralization events.

ankerite; Inner Dinarides; metasomatism; organic geochemistry; REE; siderite; stable isotopes

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