| 块状硫化物矿床与火山岩岩相的关系 |
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| 引用本文：.1984.The Relationship Between Massive Sulfide Deposits And Volcanic Rock Facies[J].Mineral Deposits,3(1):77~82 |
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| The Relationship Between Massive Sulfide Deposits And Volcanic Rock Facies |
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| Abstract:The genetic relationship between massive sulfide deposits and volcanic rock facies finds its expression in three aspects: 1. Ore-bearing portions lie mostly at the transitional positions between different volcanic rock facies. In the volcanic sedimentation section, ore beds occur where lithological characters alter in each cycle, especially where relatively basic volcanic rocks are replaced by relatively acid ones. 2. Ore deposits of different types are distributed regularly in specific volcanic, rock facies: volcanic-sedimentary deposits, volcanic exhalative-hydrothermal sedimentary deposits and volcanic ore-magmatic effusive deposits, all formed in sea-floor environment, are found respectively in sedimentary volcaniclastic rocks of distant zone, volcaniclastic rocks of intermediate zone and highly alkalic and sodium-rich basic volcanic rocks closely around the crater; volcanic ore magma-filled deposits and volcanic hydrothermal metasomatic deposits, produced at very shallow depths, are observed respectively in highly alkalic and sodium-rich basic lava of volcanic vent facies and acid volcanic rocks of volcanic vent facies and explosion facies; volcanic porphyry type deposits, formed at certain depths below the surface, mostly occur in subvolcanic and hypogene volcanic facies. The formation of different industrial types of massive sulfide deposits seem also to have been obviously under the domination of volcanic rock facies: copper-bearing pyrite type deposits and pyrite type copper-zinc deposits occur chiefly in volcanic rocks of vent or near vent facies; pyrite-polymetallic deposits and kuroko deposits exist primarily in tuff of transitional facies and distant carbonatite-terigenous rocks-tuffaceous facies. 3. Ores are noticed to occur in certain volcanic rock facies which have some distinctive characteristics in constituent, chemical composition of near-ore country rocks, texture and structure as well as mechanical properties. |
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