华南印支期湘东北三墩铜铅锌多金属矿岩浆热液成因:稀土元素和硫同位素证据

Magmatic hydrothermal metallogenic for the Sandun Cu-Pb-Zn deposit: REE and S isotope Evidences

本文对三墩铜铅锌多金属矿进行了系统矿石微量元素、矿石硫化物S同位素研究,并结合矿床地质特征探讨其矿床成因。微量元素结果表明:三墩铜铅锌多金属矿成矿元素Cu、Pb、Zn明显富集,Ag、Au比较富集。稀土元素研究表明,矿石稀土总量较低,稀土模式配分曲线与花岗岩稀土模式配方曲线类似,成矿作用与岩浆作用相关。硫同位素分析结果暗示矿床硫同位素主要来自上地幔或下地壳的深源岩浆,有部分围岩地层物质的混入。矿床为中低温岩浆热液充填矿床。

In this paper, we study the area- metallogenic of the Sandun Cu- Pb- Zn polymetallic deposit, northeastern Hunan province by trace element and S isotope analysis of ores and minerals. The trace element results of ores and wall rocks show that the rocks in Sandun deposit are high- rich in Cu- Pb- Zn and little- rich in Ag- Au.The REE element results show that the ores and the granite have the similar REE distribution patterns, and the counts of REE in ores are lower than the surrounding rocks. The area- metallogenic is relationship with the magmatic. The S isotpe results show that the isotope of the Sandun area was drived from the depth magma of the upper mantle or lower crust, and mixed with some surrounding rocks. The Sandun deposit is a magmatic hydrothermal medium- low temperature infilling- replacement Cu- Pb- Zn ploymetallic deposit.