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DOLOMITE-GROUP FERROAN CARBONATES FROM KREMIKOVTSI DEPOSIT

Margarita Vassileva, Zhelyazko Damyanov, Vasil Atanassov

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Abstract

dolomite-group ferroan carbonates (ferroan dolomite, ankerite) are the main non-metallic component in the primary ores of the Kremikovtsi deposit. They (1) formed carbonate assemblages in the transition zones between the siderite ore bodies and the host Middle Triassic dolomitic limestones, (2) accompanied all sulfide assemblages, (3) constituted alteration zones in the carbonate rocks hosting the Pb-Cu sulfide mineralization, and (4) deposited as post-ore rhombohedral crystals in cavities within the dolomitic limestones. In the non-sulfide mineral assemblages these minerals are represented by micro-grained aggregates of ferroan-manganoan dolomite in a coarse-grained ankerite matrix. Zonal manganoan ankerites with decreasing Fe contents toward the rims are characteristic for the sulfide assemblages. In cavities within the host carbonate rock linings from coarse-grained manganoan ankerite are formed with the highest FeCO3 content (up to 23 mol%) in the deposit.

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What this paper is about

dolomite-group ferroan carbonates (ferroan dolomite, ankerite) are the main non-metallic component in the primary ores of the Kremikovtsi deposit. They (1) formed carbonate assemblages in the transition zones between the siderite ore bodies and the host Middle Triassic dolomitic limestones, (2) accompanied all sulfide assemblages, (3) constituted alteration zones in the carbonate rocks hosting the Pb-Cu sulfide mineralization, and (4) deposited as post-ore rhombohedral crystals in cavities within the dolomitic limestones. In the non-sulfide mineral assemblages these minerals are represented by micro-grained aggregates of ferroan-manganoan dolomite in a coarse-grained ankerite matrix. Zonal manganoan ankerites with decreasing Fe contents toward the rims are characteristic for the sulfide assemblages. In cavities within the host carbonate rock linings from coarse-grained manganoan ankerite are formed with the highest FeCO3 content (up to 23 mol%) in the deposit.

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Available abstract

dolomite-group ferroan carbonates (ferroan dolomite, ankerite) are the main non-metallic component in the primary ores of the Kremikovtsi deposit. They (1) formed carbonate assemblages in the transition zones between the siderite ore bodies and the host Middle Triassic dolomitic limestones, (2) accompanied all sulfide assemblages, (3) constituted alteration zones in the carbonate rocks hosting the Pb-Cu sulfide mineralization, and (4) deposited as post-ore rhombohedral crystals in cavities within the dolomitic limestones. In the non-sulfide mineral assemblages these minerals are represented by micro-grained aggregates of ferroan-manganoan dolomite in a coarse-grained ankerite matrix. Zonal manganoan ankerites with decreasing Fe contents toward the rims are characteristic for the sulfide assemblages. In cavities within the host carbonate rock linings from coarse-grained manganoan ankerite are formed with the highest FeCO3 content (up to 23 mol%) in the deposit.

Key concepts: Ankerite, Dolomite, Siderite, Geology, Carbonate, Geochemistry, Sulfide, Mineralization (soil science)

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