| 上黑龙江盆地虎拉林金矿床硫、铅同位素特征及其成因探讨 |
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| 关键词:geochemistry sulfur isotope lead isotope Hulalin upper Heilongjiang basin |
| 基金项目:国家重点研发计划“蒙古—鄂霍茨克洋构造体制成矿系统物质组成与过程”(编号: 2017YFC0601303) |
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| A Study of Sulfur and Lead Isotope Characteristics and Genesis of the Hulalin Gold Deposit in Upper Heilongjiang Basin |
| The Hulalin deposit is located on the Erguna block in the east part of the central Asian orogenic belt, lies on the west side of the upper Heilongjiang basin and is adjacent to the Shaobaosi and Laogou gold deposits in the east. The gold-bearing minerals are mainly in thin-film, granular and veined pyrite forms. Mineralization is closely related to Early Cretaceous granitic porphyry, quartz porphyry and cryptoexplosive breccia. Based on detailed field work of the deposit, the authors investigated the source of metallogenic materials and the ore-forming regularity through the analysis and study of sulfur and lead isotopes of metallic sulfide. The results show that the δ34SV-CDT values of pyrite from the Hulalin ore deposit and surrounding rocks in the upper Heilongjiang basin vary from 0.7‰ to 2.2‰, 1.18‰ on average, and are concentrated around 1.0‰, exhibiting a tower distribution, showing that it is mainly magma sulfur. The 206Pb/204Pb, 207Pb/204Pb and 208Pb/204Pb values of lead isotopes vary respectively from 18.468 to 18.511, from 15.578 to 15.625, and from 38.215 to 38.370. The distribution range is narrow and exhibits orogenic belt lead characteristics. The μ values of lead isotope vary from 9.41 to 9.50, all less than 9.58; the ω values vary from 35.04 to 35.93, with an average value of 35.49, lower than that of normal lead values; Th/U ratios are in the range of 3.60~3.66. The above features show the mixed crust and mantle source characteristics. The map of lead isotopic tectonic environment shows the characteristics of partial melting of the lower crust. Δγ-Δβ diagram shows that the ore lead from the mantle and the crust mixed with subduction magmatism formed lead isotope source area. A combinational study of deposit type, orebody characteristics, orebody and wall rock sulfur and lead isotope characteristics shows that the metallogenic materials of the Hulalin gold mining area were mainly derived from the deep crustal substance formed by molten lava, with the participation of the partial melting of the upper mantle and the crust material, that the ore-forming process was closely related to the early Cretaceous magmatic activity, and that they were formed in the background of the stretching of Mongolia–Okhotsk after its closure. |
| GONG Xin,ZHAO Yuan-yi,SHUI Xin-fang,LIU Xuan,CHENG Xian-da,WANG Yuan-chao,TAN Wei.2020.A Study of Sulfur and Lead Isotope Characteristics and Genesis of the Hulalin Gold Deposit in Upper Heilongjiang Basin[J].Acta Geoscientica Sinica,41(3):395-406. |
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