Hydrothermal Mineral Deposits: Principles and Fundamental Concepts for the Exploration Geologist |
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Africa albite alkaline Archean argillic assemblages associated basaltic base metal basin biotite breccia brines calcite carbonate chalcopyrite characterised chlorite complexes continental convection crustal Damara orogen dolomite Econ Geol emplacement environment epithermal evolution facies faults fluid inclusions formation formed fractures Fyfe geochemical geochemistry Geol Soc Geology geothermal systems granite greenschist greenstone belts greisen greisenisation heat hot springs hydrothermal hydrothermal activity hydrothermal alteration hydrothermal fluids hydrothermal solutions hydrothermal systems igneous intrusion ions isotopic K-feldspar kaolinite leaching lodes mafic magmatic mantle massive sulphide deposits melt metamorphic metasomatism meteoric waters mineralisation Namibia occur oceanic crust ophiolite orebodies orogen oxides phase Pirajno plate plutonic porphyry potassic precipitation present pressure propylitic Proterozoic pyrite quartz reactions region result ridges schist sea water sedimentary sediments sequence sericite shear zones silicate skarn sphalerite stage stratabound stratiform structures subduction sulphide tectonic temperature terranes tonnes veins volatiles volcanic wall rocks