| 白果园黑色页岩型银钒矿床 |
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| 引用本文：.1986.An Account Of The Baiguoyuan Black Shale Type Silver-Vanadium Deposit[J].Mineral Deposits,5(1):53~62 |
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| An Account Of The Baiguoyuan Black Shale Type Silver-Vanadium Deposit |
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| Abstract:The deposit in question is a recently-discovered Dew type sedimentary deposit occurring in Upper Sinian carbonate formation. It contains mainly silver and vanadium in association with selenium. In addition, gold, platinum and palladium are also concentrated to some extent. Silver-vanadium rock sequence falls in the fourth lithologic section of Doushantuo Formation (Fig. 2), consisting of black shale intercalated with dolomite and containing a simple vanadium ore bed (upper ore bed) and a multiple silver-vanadium ore bed (lower ore bed). According to the density of alternation of black shale and dolomite, ore types may be grouped into "simple type", "complicated type” and "extremely complicated type” (Fig. 3). Orebodies oocur in conformity with wall rocks in stratifarm or stratoid forms (Fig. 5) with relatively stable thickness and grade. Ag, V2O5 and Se show positive correlation. Vanadium mineral is mainly vanadium-bearing hydromica, and silver minerals are naumannite, aguilarite, selenium-bearing variety of argyrodite and some others, mostly occurring in pyrite as micrometer-sized microinclusions. Silver-bearing pyrite takes spearlike (Plate-6), cubic and aggregate (Plate-8) shapes, and in accordance with its distribution and arrangement in mineralized rocks, can be divided into five types in ore structures, i,e., disseminated, laminated, striped, tabular and bird's-eye-like (caused by dissolution). The deposit is genetically of sedimentary diagenesis, controlled combinedly by such factors as stratigraphic horizon, lithofacies-paleogeography and ore fabrics. In addition, geochemical anomalies, especially drainage anomalies, are also important indicators in prospecting for this type of deposits. |
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