云南金顶铅锌矿床成矿物质来源及有机成矿作用

Ore Sources and Organic Mineralization in the Jinding Lead-Zinc Deposit,Yunnan Province

分析了金顶铅锌矿床同位素及生物标志化合物特征,探讨了矿床成矿物质来源及有机成矿作用。结果表明,矿石铅主要来自上地幔,成矿流体主要为地幔流体和盆地卤水。矿区有机质的母质来源以低等水生生源的海藻类为主,同时伴随有一定量的陆源高等植物组分的输入,有机质来源于三叠纪三合洞组碳酸盐岩地层。有机质在成矿作用中可能起到的作用有:还原硫酸盐提供成矿所需的硫源;形成有机-金属络合物,活化运移成矿金属元素;改变成矿物理化学环境对成矿物质的还原沉淀作用。

This paper focuses on discussing the origin of ore-forming substances and organic mineralization through analyzing the isotope and biomarker compounds of Jinding Lead-zinc Deposit. The result shows that most of lead metal in the ore originated form upper mantle and the ore-forming fluids mainly derived from mantle fluids and basin saline. The matrix of organic substances mainly derived from low-grade water-sourced alga, while associated with a certain mount of high-grade continent-sourced botanic components. Organic substance derived from carbonate rocks in Triassic Sanhedong Formation. The roles organic substance possibly playing among the forming process of Jinding lead zinc deposit are： deoxidized the sulfate to produce the sulfur which needed in oreforming process; formed organic complex and metallic eomplex; activated and transited ore-forming metallic elements; changed the physical-chemical environment of ore-formation; deoxidized and deposited ore-forming materials.