中文摘要：

广东天堂矽卡岩型铜铅锌多金属矿床位于钦州—杭州成矿带阳春盆地的东北端边缘。在野外地质观察的基础上,选取该矿床主要金属硫化物开展矿物学特征研究,测定S、Pb同位素组成,探讨其成矿物质来源。电子探针分析发现：黄铁矿中Fe、S含量和S/Fe原子比普遍高于理论值,存在一定量的Cu、Sb、As,Co/Ni比值变化范围为0.21-2.28,一般大于1,指示硫逸度较高的热液环境;闪锌矿中Zn含量比理论值稍低,S/Zn原子比和S含量较理论值偏高,含一定量的Pb、Fe、Co和Se等元素;方铅矿、黄铜矿等硫化物元素间均有类质同象现象的发生。硫化物的δ34S组成范围比较窄,变化范围为-2.1‰-2.6‰,多数集中在-0.8‰-0.4‰,具有明显的塔式分布特征。矿石矿物Pb同位素组成亦比较稳定,208Pb/204Pb、207Pb/204Pb、206Pb/204Pb的变化范围分别为38.765-39.137、15.523-15.751、18.450-18.667,矿石铅既具有下地壳或者上地幔的特征,又具有上地壳的特征,显示混合源特征,表明成矿物质属于壳幔混合型,具有多种物质来源,可能是晚中生代以来华南地区岩石圈伸展作用的产物。

英文摘要：

The Tiantang Cu-Pb-Zn polymetallic deposit of Guangdong Province occurs at the northeast edge of Yangchun basin,which is located in the Qinzhou-Hangzhou metallogenic belt.On the basis of geological field observations,the authors selected main sulfides in the deposit as the object to study the mineralogical characteristics,and analyzed the S-Pb isotopic composition so as to trace and discuss the sources of ore-forming metal materials.Representative results 1 of electron microprobe analysis show that Fe and S content and atomic ratios of S/Fe in pyrite are higher than theoretical values,there exist Cu,Sb and As,and the ratios of Co/Ni are between 0.21 and 2.28,usually higher than 1,suggesting a hydrothermal environment of relatively high sulfur fugacity;in sphalerite the Zn content is lower than theoretical values while the atomic ratios of S/Zn and the S content are higher than theoretical values,with the existence of some Pb,Fe,Co and Se;some elements in galena,chalcopyrite and other sulfides occur in isomorphism.δ34S values of the main ore minerals of this deposit have a narrow range of-2.1‰-2.6‰,with peaks at-0.8‰-0.4‰,showing tower-shaped distribution effect and features of magmatic sulfur.Lead isotopic compositions of ores are basically coincident,and 208Pb/204Pb,207Pb/204Pb and 206Pb/204Pb ratios of ores vary from 38.765 to 39.137,15.523 to 15.751 and 18.450 to 18.667,respectively.These lead compositions indicate that the ore-forming materials not only had features of the lower crust or the upper mantlebut also had characteristics of the upper crust,indicating that there should have been several sources for ore-forming materials in the Tiantang deposit,belonging to crust-mantle mixture,and the ore deposit was formed due to lithospheric extension in southern China since the Late Mesozoic.