The Xijiazhuang gold-lead-zinc polymetallic deposit is located in the southeastern margin of the North China Craton,in the western part of the Tan-Lu Fault Zone in eastern China.It is a newly discovered polymetallic deposit as a breakthrough in mineral exploration in the thick overburden area in northwestern Anhui.Based on the geological characteristics of the deposit and the geochemical survey results of carbon,oxygen,sulfur and lead isotopes,this paper discusses the sources of ore-forming fluids and materials,indicating that the δ13CV-PDB value of hydrothermal calcite,the predominant gangue mineral,spans from-3.8‰ to-5.5‰,averaging-4.7‰,while the δ18OV-SMOW value ranges between 11.9‰ and 14.2‰,averaging 13.0‰,which suggest that the ore-forming fluid originates mainly from deep magmatic hydrothermal solution,with significant water-rock interactions contributing to the incorporation of carbon and oxygen from marine carbonate rocks.The sulfur isotopic composition of ore minerals pyrite,galena,and sphalerite shows δ34Spyrite>δ34Ssphalerite>δ34Sgalena,indicating that sulfur isotopic fractionation has basically reached equilibrium;the δ34S value ranges from 3.7‰to 6.0‰,with an average of 5.2‰,indicating that the mineralizing material comes from magma and partially from strata.The ore minerals of pyrite and galena have values of 206Pb/204Pb ranging from 16.742 to 16.787,207Pb/204Pb from 15.333 to 15.399,and 208Pb/204Pb from 37.298 to 37.482,all of which lie in the domain between the lower crust and orogenic belt,or in that of lower crust,indicating that lead in the ore comes mostly from the lower crust and mantle,with the characteristics of the two combined.
Au,Pb and ZnC and O isotopesS isotopePb isotopesources of ore-forming materialsXijiazhuang depositBengbu uplift
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