论文部分内容阅读
Our metallogenic studies of the Dachang ore field show that the country-rock media have greatinfluence on the process of mineralization.They can not only contribute part of the ore-formingmaterial,but also have influence on the geochemical evolution of granitic magma and ore fluids,TheDachang ore field can be taken as a typical example to show the influence of country-rock media onmineralization.Geological field investigations indicate that where granites nitruded weakly alkaliccountry rocks(e.g.middle Devonian limestones and silicorites of platform facies in the Dachang),instead of carbonaceous shales of reducing basin facies,Sn would be able to enter rock-formingminerals in large quantities to form cassiterite-sulfide ore deposits of commercial value.So,it may beconcluded that the process of magmatic differentiation-evolution,mineralization and tectonic settingsof ore deposits are,more or less,controlled by their country-rock media.
Our metallogenic studies of the Dachang ore field show that the country-rock media have great inluence on the process of mineralization. The can not only contribute part of the ore-forming material, but also have influence on the geochemical evolution of granitic magma and ore fluids, The DAChang ore field can be taken as a typical example to show the influence of country-rock media on mineralization. Geological field investigations indicate that where granites nitruded weakly alkaliccountry rocks (egmiddle Devonian limestones and silicorites of platform facies in the Dachang), instead of carbonaceous shales of reducing basin facies, sn would be able to enter rock-forming minerals in large quantities to form cassiterite-sulfide ore deposits of commercial value. so, it may beconcluded that the process of magmatic differentiation-evolution, mineralization and tectonic settings of ore deposits are. , more or less, controlled by their country-rock media.