Abstract:Tungsten vein deposits in south China are characterized by zonation in appearance. Vertically five zones could be roughly recognized in downward succession: linear vein zone, veinlet zone, thin vein zone, large vein zone and extinction zone. The so-called surface indicator zones refer to the first two zones occuring at the top of a deposit which, having no commercial value themselves, serve well as an indicator for mineral exploration. As weathering and rock disintegration vary in extent from deposit to deposit, these deposits are terminologically called blind to semi-blind deposits. The following aspects are emphasized in the identification and evaluation of the indicator zones: (1) their structural positions; (2) their fabric patterns in plane; (3) their horizontal zoning; (4) their characteristics in shape, such as the structural type, attitude, configuration, size, density of veins and total thickness; (5) the indicating components present, including diagnostic minerals (nonmetallic and/or metallic minerals) and indicator elements (metallogenic elements, volatile elements and rare or alkaline elements); (6) wall rock alterations and, zonation; (7) geologic and geochemical halos surrounding these indicator zones, chiefly vein halo, heavy mineral halo, primary dispersion halo, secondary dispersion halo and evaporite and thermal halos of mineral inclusions. It should be pointed out that similar indicator zones have been found in numerous other endogenic metallic deposits. These zones can perform the same function of indicating mineralization in spite of their respective peculiarities. Therefore, great attention should be paid to the observation and evaluation of mineralized linear vein zones or veinlet zones in search for endogenic metallic deposits.
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古菊云.1984.华南隐伏-半隐伏脉钨矿床的地表标志带[J].矿床地质,3(1):67~76.1984.The Surface Indicator Zones Of The Blind-Semi-Blind Tungsten Vein Deposits In South China[J].Mineral Deposits3(1):67~76
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