Mineralization of Shangong Gold Deposit in Henan Province——Constraints from carbon,hydrogen,and oxygen isotopes AITranslate

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Chinese Library Classification Number:P618.51[天文地球—矿床学]

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The Shanggong Gold Deposit has proven gold resources exceeding 140 t,reaching a super-large scale.In recent years,deep validation boreholes have encountered polymetallic orebodies,which have raised new requirements for understanding its mineralization.Carbon,hydrogen,and oxygen isotope analyses were conducted on quartz and ankerite from different mineralization stages of the Shanggong Gold Deposit.The results show that theδ¹⁸O_{H_(2}O) values of quartz range from−2.5‰to 1.6‰,with an average of−0.4‰;theδD_{H_(2}O)values range from−94.7‰to−86.5‰,with an average of−90.6‰,which are close to magmatic water.Theδ¹⁸O_{H_(2}O)-δD_{H_(2}O)diagram indicates a transitional trend from meteoric water to primary magmatic water for the ore-forming fluids of gold deposits in the region.Theδ¹³ C_{CO_(2})values of quartz range from−11.9‰to−5.3‰,with an average of−7.9‰,which are significantly higher than those of organic matter and freshwater CO₂ but lower than those of marine carbonates,and they are comparable to those of the crust,mantle,igneous rocks/magmatic systems,and atmospheric CO₂.Theδ¹³C_V-PDB values of ankerite range from−2.0‰to−1.2‰,with an average of−1.4‰,which are higher than theδ¹³C composition of other carbon reservoirs except marine carbonates.Mantle degassing and magmatic processes are the main sources ofδ¹³C in the Shanggong Gold Deposit.However,there is an obvious gradual transition phenomenon among gold deposits in the region,which has been significantly influenced by low-temperature alteration and meteoric water.Differences in structural settings or magmatic activity backgrounds have led to variations in theδ¹³C sources of the gold deposits.