滇东北地区渔户村组铅锌矿稳定同位素地球化学特征

Characterisitcs of stable isotope geochemistry of lead and zinc deposit in Yuhucun formation in northeast Yunnan

滇东北地区是我国铅锌矿重要矿集区之一,渔户村组铅锌矿是滇东北地区重要的容矿层之一。通过对滇东北地区渔户村组铅锌矿床的铅同位素、硫同位素、氢氧同位素进行系统的研究,得出渔户村组铅锌矿床成矿物质来源有多源特征,成矿过程具有多期性、多阶段性。该区的铅主要来自地壳,也有少量来自地幔和造山带;硫主要来自海水,少量来自生物硫;成矿流体主要为大气降水,同时可能有少量原始岩浆水的加入。

Northeast Yunnan is one of the important lead and zinc ore accumulative zones while Yuhucun lead and zinc deposit is one of the ore containing stratum in Yuhucun formation in the region. The conclusion is that lead and zinc deposit＇s composition came from multiple-source and the formative processes was multi-period and multi-stage according to the research on Pb isotope, S isotope and H-O isotope of lead and zinc deposit in Yuhucun formation in northeast Yunnan. Pb came mostly from earth crust with a small amount coming from the mantle and orogenic belt. S originated from marine with a small amount from biological ac- tion. The main metallogenic fluid came from meteorological water and a small amount maybe came from Magmatic water.