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宁芜地区玢岩铁矿Pb同位素研究
引用本文:马芳,蒋少涌,姜耀辉,王汝成,凌洪飞,倪培.宁芜地区玢岩铁矿Pb同位素研究[J].地质学报,2006,80(2):279-288.
作者姓名:马芳  蒋少涌  姜耀辉  王汝成  凌洪飞  倪培
作者单位:1. 南京大学地球科学系成矿作用国家重点实验室,210093;北京大学地球与空间科学学院教育部造山带与地壳演化重点实验室,100871
2. 南京大学地球科学系成矿作用国家重点实验室,210093
基金项目:国家自然科学基金项目(编号40221301,40503006,40234051)资助的成果。
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。

关 键 词:Pb同位素  玢岩铁矿  宁芜
修稿时间:2005年3月21日

Pb Isotope Research of Porphyrite Fe Deposits in the Ning-Wu Area
MA Fang,JIANG Shaoyong ,JIANG Yaohui ,WANG Rucheng ,LIN Hongfei ,NI Rei State Key Laboratory for Mineral Deposits Research,.Pb Isotope Research of Porphyrite Fe Deposits in the Ning-Wu Area[J].Acta Geologica Sinica,2006,80(2):279-288.
Authors:MA Fang  JIANG Shaoyong  JIANG Yaohui  WANG Rucheng  LIN Hongfei  NI Rei State Key Laboratory for Mineral Deposits Research  
Affiliation:Peking University
Abstract: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.
Keywords:Pb isotope  porphyry iron deposits  Ning-Wu area
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