Thermodynamic Constraints on Mineral Assemblages and Differentiation of Hydrothermal Pb-Zn Deposits in the Liaoji Metallogenic Belt-A Case Study of the Hongqi Pb-Zn Deposit in Xiuyan

被引：0

作者：

Xie W. ^{[1
]}

Wen S. ^{[1
]}

机构：

[1] School of Resources and Civil Engineering, Northeastern University, Shenyang, 110819, Liaoning

来源：

Geotectonica et Metallogenia | 2020年 / 44卷 / 01期

关键词：

Liaoji metallogenic belt; Migration and precipitation of ore-forming materials; Mineral assem¬blages; Thermodynamic phase diagram; Xiuyan Hongqi Pb-Zn deposit;

D O I：

10.16539/j.ddgzyckx.2020.01.007

中图分类号：

学科分类号：

摘要：

Hydrothermal Pb-Zn deposits are widely distributed in the Liaoji metallogenic belt. The mineral assemblages and mechanism of ore metal migration and precipitation are key issues in metallogenetic study of this type of deposits. The lg[Cu2+]-pH, lg[HS-]-pH and Eh-pH phase diagrams established on the basis of thermodynamic equilibrium calculation of the mineral assemblages can effectively explain the physical and chemical conditions of ore-forming fluids and the process of migration and precipitation. This study took a typical hydrothermal Pb-Zn deposit, i.e., the Xiuyan Hongqi Pb-Zn deposit in the Liaoji metallogenic belt as an example, and calculated the thermodynamic equilibrium of the pyrite, chalcopyrite, galena and sphalerite ore mineral assemblage. The thermodynamic lg[Cu2+]-pH, lg[HS-]-pH and Eh-pH phase diagrams were established for three different temperatures, i.e., 473 K, 549 K, and 648 K. The phase diagrams showed that the mechanism of ore metal migration and precipitation and the formation of the mineral assemblages are mainly controlled by temperature, ionic activity, pH and Eh of ore-forming fluids. This study is of great significance to explain the migration and precipitation mechanism and mineral assemblages of typical hydrothermal Pb-Zn deposits in the Liaoji metallogenic belt. © 2020, Science Press. All right reserved.

引用

页码：92 / 102

页数：10

共 5 条

[1] Duan X.X., Zeng Q.D., Wang Y.B., Zhou L.L., Chen B., Genesis of the Pb-Zn deposits of the Qingchengzi ore field, eastern Liaoning, China: Constraints from carbonate LA-ICPMS trace element analysis and C-O-S-Pb isotopes, Ore Geology Reviews, 89, pp. 752-771, (2017)
[2] Ma Y.B., Bagas L., Xing S.W., Zhang S.T., Wang R., Zhang Z.J., Zou Y.F., Yang X.Q., Wang Y., Zhang Y., Genesis of the stratiform Zhenzigou Pb-Zn deposit in the North China Craton: Rb-Sr and C-O-S-Pb isotope constraints, Ore Geology Reviews, 79, pp. 88-104, (2016)
[3] Reed M., James P., Sulfide mineral precipitation from hydrothermal fluids, Reviews in Mineralogy Geochemistry, 61, 1, pp. 609-631, (2006)
[4] Worley B., Powell R., Making movies: Phase diagrams changing in pressure temperature composition and time, Geological Society of London of Special Publications, 138, 1, pp. 269-280, (1998)
[5] Yu G., Chen J.F., Xue C.J., Chen Y.C., Chen F.K., Du X.Y., Geochronological framework and Pb, Sr isotope geochemistry of the Qingchengzi Pb-Zn-Ag-Au orefield, Northeastern China, Ore Geology Reviews, 35, 3-4, pp. 367-382, (2009)

← 1 →