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中文摘要：
本文对宁芜地区铁矿床中磷灰石和矿石进行了Pb同位素测定。磷灰石的^208Pb-^232Th等时线年龄为124Ma，与辉长闪长（玢）岩和钠长石岩的形成年龄均相吻合，为成矿时代与成岩时代相近提供了佐证。岩体长石Pb同位素显示，宁芜地区中生代火成岩的原始岩浆受到了大陆壳深部3．3Ga的古老岩系的混染。矿床中矿石铅主要来自赋矿母岩浆。成矿流体具有异常高的Th／U值，表明Th相对U的明显富集，这可能反映了流体中卤素为主要的矿物质迁移载体。
英文摘要：
This paper presents the measurements of Pb isotope compositions of apatite, magnetite and pyrite in the Washan and Dongshan iron deposits in the Ning-Wu （Nanjing-Wuhu） area. The ^232Th-^208Pb isochron age of apatite is 124 Ma, which is consistent with the ages of gabbroic dioritic porphyrite and albitite, suggesting that the ore-formation age is similar to that of the rocks. The initial magma of Mesozoic igneous rocks in the study area was mixed with 3. 3 Ga old rock series in the deep continent. Ore lead of the deposits mainly came from magma of ore-bearing matrices. The ore-forming fluid has a specially high ratio of Th/U, indicating obvious enrichment of Th compared with U, which probably reflects that halogen complex is the main carrier for the migration of mineral substance in the fluid.
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